■ SQLite 파일의 연결 문자열을 설정하는 방법을 보여준다. ▶ 기본
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Data Source=c:\test.db;Version=3; |
▶ 메모리 데이터베이스 사용시
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Data Source=:memory:;Version=3;New=True; |
▶ UTF16 사용시
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Data Source=c:\test.db;Version=3;UseUTF16Encoding=True; |
▶ 3.3X
■ 연결 문자열 설정을 사용해 대량 데이터 추가시 속도를 향상시키는 방법을 보여준다. ▶ TestModel.cs
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namespace TestProject { /// <summary> /// 테스트 모델 /// </summary> public class TestModel { //////////////////////////////////////////////////////////////////////////////////////////////////// Property ////////////////////////////////////////////////////////////////////////////////////////// Public #region 컬럼 01 - COLUMN01 /// <summary> /// 컬럼 01 /// </summary> public string COLUMN01 { get; set; } #endregion #region 컬럼 02 - COLUMN02 /// <summary> /// 컬럼 02 /// </summary> public string COLUMN02 { get; set; } #endregion #region 컬럼 03 - COLUMN03 /// <summary> /// 컬럼 03 /// </summary> public string COLUMN03 { get; set; } #endregion #region 컬럼 04 - COLUMN04 /// <summary> /// 컬럼 04 /// </summary> public string COLUMN04 { get; set; } #endregion #region 컬럼 05 - COLUMN05 /// <summary> /// 컬럼 05 /// </summary> public string COLUMN05 { get; set; } #endregion #region 컬럼 06 - COLUMN06 /// <summary> /// 컬럼 06 /// </summary> public string COLUMN06 { get; set; } #endregion #region 컬럼 07 - COLUMN07 /// <summary> /// 컬럼 07 /// </summary> public string COLUMN07 { get; set; } #endregion #region 컬럼 08 - COLUMN08 /// <summary> /// 컬럼 08 /// </summary> public string COLUMN08 { get; set; } #endregion #region 컬럼 09 - COLUMN09 /// <summary> /// 컬럼 09 /// </summary> public string COLUMN09 { get; set; } #endregion #region 컬럼 10 - COLUMN10 /// <summary> /// 컬럼 10 /// </summary> public string COLUMN10 { get; set; } #endregion } } |
▶ RandomStringHelper.cs
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using System; using System.Text; namespace TestProject { /// <summary> /// 임의 문자열 헬퍼 /// </summary> public static class RandomStringHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region Field /// <summary> /// 숫자만 /// </summary> public static readonly string OnlyDigit = "9"; /// <summary> /// 소문자만 /// </summary> public static readonly string OnlyLowerCharacter = "z"; /// <summary> /// 대문자만 /// </summary> public static readonly string OnlyUpperCharacter = "Z"; /// <summary> /// 숫자와 대문자 /// </summary> public static readonly string DigitANdUpperCharacter = "9Z"; /// <summary> /// 숫자와 소문자 /// </summary> public static readonly string DigitAndLowerCharacter = "9z"; /// <summary> /// 모든 문자 /// </summary> public static readonly string AllCharacter = "9Zz"; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 임의 문자열 구하기 - GetRandomString(length, randomType) /// <summary> /// 임의 문자열 구하기 /// </summary> /// <param name="length">길이</param> /// <param name="randomType">임의 타입</param> /// <returns>임의 문자열</returns> public static string GetRandomString(int length, string randomType = "9") { StringBuilder result = new StringBuilder(); int digitStart = 48; int digitEnd = 57; int upperCharacterStart = 65; int upperCharacterEnd = 90; int lowerCharacterStart = 97; int lowerCharacterEnd = 122; int start = 0; int end = 0; Random random = new Random(DateTime.Now.Millisecond); for(int i = 1; i <= length; i++) { string nextRandomType = randomType; if(randomType.Length >= 2) { Random _ = new Random(DateTime.Now.Millisecond); int next = 1; switch(randomType.Length) { case 2 : next = random.Next(1, 3); if(next == 2) { if(randomType == "9Z") { next = 3; } else if(randomType == "9z") { next = 2; } } break; case 3 : next = random.Next(1, 4); break; } switch(next) { case 1 : nextRandomType = "9"; break; case 2 : nextRandomType = "z"; break; case 3 : nextRandomType = "Z"; break; } } switch(nextRandomType) { case "Z" : start = upperCharacterStart; end = upperCharacterEnd; break; case "z" : start = lowerCharacterStart; end = lowerCharacterEnd; break; case "9" : start = digitStart; end = digitEnd; break; } result.Append(char.ConvertFromUtf32(random.Next(start, end + 1))); } return result.ToString(); } #endregion } } |
▶ Program.cs
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using System; using System.Collections.Generic; using System.Data.SQLite; using System.Diagnostics; using System.IO; using Dapper; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 테이블 생성 SQL /// </summary> private static string _createTableSQL = @" CREATE TABLE test ( COLUMN01 TEXT ,COLUMN02 TEXT ,COLUMN03 TEXT ,COLUMN04 TEXT ,COLUMN05 TEXT ,COLUMN06 TEXT ,COLUMN07 TEXT ,COLUMN08 TEXT ,COLUMN09 TEXT ,COLUMN10 TEXT ); "; /// <summary> /// 삽입 SQL /// </summary> private static string _insertSQL = @" INSERT INTO Test ( COLUMN01 ,COLUMN02 ,COLUMN03 ,COLUMN04 ,COLUMN05 ,COLUMN06 ,COLUMN07 ,COLUMN08 ,COLUMN09 ,COLUMN10 ) VALUES ( @COLUMN01 ,@COLUMN02 ,@COLUMN03 ,@COLUMN04 ,@COLUMN05 ,@COLUMN06 ,@COLUMN07 ,@COLUMN08 ,@COLUMN09 ,@COLUMN10 ) "; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 로그 쓰기 - WriteLog(source) /// <summary> /// 로그 쓰기 /// </summary> /// <param name="source">소스 문자열</param> private static void WriteLog(string source) { Console.WriteLine($"[{DateTime.Now:HH:mm:ss}] {source}"); } #endregion #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { string filePath = "test.db3"; if(File.Exists(filePath)) { File.SetAttributes(filePath, FileAttributes.Normal); File.Delete(filePath); } WriteLog("추가할 데이터 생성을 시작합니다."); List<TestModel> sourceList = new List<TestModel>(); for(int i = 0; i < 100_000; i++) { TestModel test = new() { COLUMN01 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN02 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN03 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN04 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN05 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN06 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN07 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN08 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN09 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter), COLUMN10 = RandomStringHelper.GetRandomString(10, RandomStringHelper.AllCharacter) }; sourceList.Add(test); } WriteLog("추가할 데이터 생성을 종료합니다."); string connectionString = $"Data Source={filePath};Version=3;Synchronous=OFF;Journal Mode=OFF;"; using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { connection.Execute(_createTableSQL); WriteLog($"데이터 추가를 시작합니다 : {sourceList.Count:#,##0}건"); Stopwatch watch = new Stopwatch(); watch.Start(); connection.Execute(_insertSQL, sourceList); watch.Stop(); WriteLog("데이터 추가를 종료합니다."); WriteLog($"데이터 추가 경과 시간 : {watch.Elapsed}"); } } #endregion } } |
TestProject.zip
■ SqlMapper 클래스의 QueryMultiple 확장 메소드를 사용해 복수 SELECT문을 실행하는 방법을 보여준다. ▶ Program.cs
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using System; using System.Data.SQLite; using Dapper; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { string connectionString = $"Data Source={"test.db"};"; string sql = @" SELECT * FROM School; SELECT * FROM Student; "; using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { using(var reader = connection.QueryMultiple(sql)) { var resultEnumerable1 = reader.Read<dynamic>(); var resultEnumerable2 = reader.Read<dynamic>(); foreach(dynamic result in resultEnumerable1) { Console.WriteLine($"{result.ID}, {result.NAME}"); } Console.WriteLine(); foreach(dynamic result in resultEnumerable2) { Console.WriteLine($"{result.ID}, {result.NAME}, {result.HEIGHT}"); } } } } #endregion } } |
TestProject.zip
■ DynamicParameters 클래스를 사용하는 방법을 보여준다. ▶ Program.cs
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using System; using System.Collections.Generic; using System.Data.SQLite; using Dapper; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { string connectionString = $"Data Source={"test.db"};"; string sql = "SELECT * FROM Student WHERE NAME LIKE @NAME || '%'"; using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { DynamicParameters parameters = new DynamicParameters(); parameters.Add("NAME", "김"); IEnumerable<dynamic> resultEnumerable = connection.Query(sql, parameters); foreach(dynamic result in resultEnumerable) { Console.WriteLine($"{result.ID}, {result.NAME}, {result.HEIGHT}"); } } } #endregion } } |
TestProject.zip
■ dynamic 타입 결과를 쿼리하는 방법을 보여준다. ▶ Program.cs
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using System; using System.Collections.Generic; using System.Data.SQLite; using Dapper; namespace TestProject { /// <summary> /// 프로그램 /// </summary> class Program { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Private #region 프로그램 시작하기 - Main() /// <summary> /// 프로그램 시작하기 /// </summary> private static void Main() { string connectionString = $"Data Source={"test.db"};"; using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { IEnumerable<dynamic> resultEnumerable = connection.Query("SELECT * FROM Student"); foreach(dynamic result in resultEnumerable) { Console.WriteLine($"{result.ID}, {result.NAME}, {result.HEIGHT}"); } } } #endregion } } |
TestProject.zip
■ 네트워크 드라이브 경로의 SQLite 데이터베이스 파일 연결 문자열을 구하는 방법을 보여준다. ▶ 예제 코드 (C#)
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string connectionString = @"Data Source='//192.168.29.196/data/test.db';Version=3"; |
■ 컬럼명을 체크하는 방법을 보여준다. ▶ 컬럼명 체크하기 예제 (XAML)
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using System; string connectionString = "Data Source=d:\\arca.db;"; string tableName = "COM_USER"; string columnName = "NAME"; bool result = CheckColumnName(connectionString, tableName, columnName); Console.WriteLine(result); |
▶ 컬럼명 체크하기 (XAML)
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using System.Data.SQLite; #region 컬럼명 체크하기 - CheckColumnName(connectionString, tableName, columnName) /// <summary> /// 컬럼명 체크하기 /// </summary> /// <param name="connectionString">연결 문자열</param> /// <param name="tableName">테이블명</param> /// <param name="columnName">컬럼명</param> /// <returns>컬럼명 체크 결과</returns> public bool CheckColumnName(string connectionString, string tableName, string columnName) { using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { connection.Open(); var command = connection.CreateCommand(); command.CommandText = string.Format("PRAGMA table_info({0})", tableName); var reader = command.ExecuteReader(); int nameIndex = reader.GetOrdinal("Name"); while(reader.Read()) { if(reader.GetString(nameIndex).Equals(columnName)) { connection.Close(); return true; } } connection.Close(); } return false; } #endregion |
■ SQLiteFunction 클래스에서 커스텀 함수를 사용하는 방법을 보여준다. ▶ MainForm.cs
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using System; using System.Collections.Generic; using System.Data; using System.Data.SQLite; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region CREATE_STUDENT_TABLE_SQL /// <summary> /// CREATE_STUDENT_TABLE_SQL /// </summary> private const string CREATE_STUDENT_TABLE_SQL = @" CREATE TABLE STUDENT_TABLE ( NAME TEXT NOT NULL ,SCORE REAL NOT NULL ) "; #endregion #region INSERT_STUDENT_TABLE_SQL /// <summary> /// INSERT_STUDENT_TABLE_SQL /// </summary> private const string INSERT_STUDENT_TABLE_SQL = @" INSERT INTO STUDENT_TABLE ( NAME ,SCORE ) VALUES ( @NAME ,@SCORE ); "; #endregion #region SELECT_STUDENT_TABLE_SQL /// <summary> /// SELECT_STUDENT_TABLE_SQL /// </summary> private static string SELECT_STUDENT_TABLE_SQL = @" SELECT NAME ,AVG(SCORE) AS AVG ,AVERAGE(SCORE) AS AVERAGE ,STDEV(SCORE) AS STDEV FROM STUDENT_TABLE GROUP BY NAME; "; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.Load += Form_Load; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 폼 로드시 처리하기 - Form_Load(sender, e) /// <summary> /// 폼 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Load(object sender, EventArgs e) { using(SQLiteConnection connection = SQLiteHelper.GetConnection("Data Source=:memory:")) { connection.Open(); SQLiteFunction.RegisterFunction(typeof(SQRT)); SQLiteFunction.RegisterFunction(typeof(AVERAGE)); SQLiteFunction.RegisterFunction(typeof(STDEV)); // 학생 테이블을 생성한다. SQLiteHelper.Execute(connection, CREATE_STUDENT_TABLE_SQL); // 학생 데이터를 추가한다. InsertStudentData(connection); DataTable resultTable = SQLiteHelper.GetDataTable(connection, SELECT_STUDENT_TABLE_SQL); this.dataGridView.DataSource = resultTable; } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 학생 데이터 추가하기 - InsertStudentData(connection, name, score) /// <summary> /// 학생 데이터 추가하기 /// </summary> /// <param name="connection">연결</param> /// <param name="name">성명</param> /// <param name="score">점수</param> /// <returns>처리 행 수</returns> private int InsertStudentData(SQLiteConnection connection, string name, double score) { List<SQLiteParameter> parameterList = new List<SQLiteParameter>() { new SQLiteParameter { ParameterName = "@NAME" , DbType = DbType.String, Value = name }, new SQLiteParameter { ParameterName = "@SCORE", DbType = DbType.Double, Value = score } }; int result = SQLiteHelper.Execute(connection, INSERT_STUDENT_TABLE_SQL, parameterList); return result; } #endregion #region 학생 데이터 추가하기 - InsertStudentData(connection) /// <summary> /// 학생 데이터 추가하기 /// </summary> /// <param name="connection">연결</param> private void InsertStudentData(SQLiteConnection connection) { InsertStudentData(connection, "김철수", 100.0); InsertStudentData(connection, "김철수", 95.5); InsertStudentData(connection, "김철수", 80.3); InsertStudentData(connection, "김철수", 100.0); InsertStudentData(connection, "김철수", 90.7); InsertStudentData(connection, "이영희", 100.0); InsertStudentData(connection, "이영희", 100.0); InsertStudentData(connection, "이영희", 80.1); InsertStudentData(connection, "이영희", 85.3); InsertStudentData(connection, "이영희", 90.5); } #endregion } } |
▶ SQRT.cs
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using System; using System.Data.SQLite; namespace TestProject { /// <summary> /// 제곱근 함수 /// </summary> [SQLiteFunction(Arguments = 1, FuncType = FunctionType.Scalar, Name = "SQRT")] public class SQRT : SQLiteFunction { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 호출하기 - Invoke(argumentArray) /// <summary> /// 호출하기 /// </summary> /// <param name="argumentArray">인자 배열</param> /// <returns>처리 결과</returns> public override object Invoke(object[] argumentArray) { return Math.Sqrt((double)argumentArray[0]); } #endregion } } |
▶ AVERAGE.cs
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using System.Data.SQLite; namespace TestProject { /// <summary> /// 평균 함수 /// </summary> [SQLiteFunction(Arguments = 1, FuncType = FunctionType.Aggregate, Name = "AVERAGE")] public class AVERAGE : SQLiteFunction { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 카운트 /// </summary> private int count = 0; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 단계별 처리하기 - Step(argumentArray, stepNumber, contextData) /// <summary> /// 단계별 처리하기 /// </summary> /// <param name="argumentArray">인자 배열</param> /// <param name="stepNumber">단계 변호</param> /// <param name="contextData">컨텍스트 데이터</param> public override void Step(object[] argumentArray, int stepNumber, ref object contextData) { if(contextData == null) { contextData = 0.0; this.count = 0; } contextData = (double)contextData + (double)argumentArray[0]; this.count++; } #endregion #region 최종 처리하기 - Final(contextData) /// <summary> /// 최종 처리하기 /// </summary> /// <param name="contextData">컨텍스트 데이터</param> /// <returns>결과</returns> public override object Final(object contextData) { return (double)contextData / count; } #endregion } } |
▶ STDEV.cs
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using System; using System.Collections.Generic; using System.Data.SQLite; using System.Linq; namespace TestProject { /// <summary> /// 표준 편차 함수 /// </summary> [SQLiteFunction(Arguments = 1, FuncType = FunctionType.Aggregate, Name = "STDEV")] public class STDEV : SQLiteFunction { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 소스 리스트 /// </summary> private List<double> sourceList = new List<double>(); #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Public #region 단계별 처리하기 - Step(argumentArray, stepNumber, contextData) /// <summary> /// 단계별 처리하기 /// </summary> /// <param name="argumentArray">인자 배열</param> /// <param name="stepNumber">단계 변호</param> /// <param name="contextData">컨텍스트 데이터</param> public override void Step(object[] argumentArray, int stepNumber, ref object contextData) { if(contextData == null) { contextData = 0; this.sourceList.Clear(); } this.sourceList.Add((double)argumentArray[0]); } #endregion #region 최종 처리하기 - Final(contextData) /// <summary> /// 최종 처리하기 /// </summary> /// <param name="contextData">컨텍스트 데이터</param> /// <returns>결과</returns> public override object Final(object contextData) { if(this.sourceList.Count == 1) { return double.NaN; } double average = this.sourceList.Average(); double minusSquareSummary = 0.0; foreach(double source in sourceList) { minusSquareSummary += (source - average) * (source - average); } double stdev = Math.Sqrt(minusSquareSummary / (sourceList.Count - 1)); return stdev; } #endregion } } |
TestProject.zip
■ 피벗 테이블을 생성하는 방법을 보여준다. ▶ MainForm.cs
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using System; using System.Collections.Generic; using System.Data; using System.Data.SQLite; using System.Windows.Forms; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : Form { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region CREATE_SOURCE_TABLE_SQL /// <summary> /// CREATE_SOURCE_TABLE_SQL /// </summary> private const string CREATE_SOURCE_TABLE_SQL = @" CREATE TABLE SOURCE_TABLE ( MANAGER TEXT NOT NULL ,SALES_MONTH TEXT NOT NULL ,SALES_AMOUNT INTEGER NOT NULL ,PRIMARY KEY(MANAGER, SALES_MONTH) ); "; #endregion #region INSERT_SOURCE_TABLE_SQL /// <summary> /// INSERT_SOURCE_TABLE_SQL /// </summary> private const string INSERT_SOURCE_TABLE_SQL = @" INSERT INTO SOURCE_TABLE ( MANAGER ,SALES_MONTH ,SALES_AMOUNT ) VALUES ( @MANAGER ,@SALES_MONTH ,@SALES_AMOUNT ); "; #endregion #region SELECT_COLUMN_COLUMN_VALUE_SQL /// <summary> /// SELECT_COLUMN_COLUMN_VALUE_SQL /// </summary> private const string SELECT_COLUMN_COLUMN_VALUE_SQL = "SELECT DISTINCT SALES_MONTH FROM SOURCE_TABLE ORDER BY SALES_MONTH ASC"; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.Load += Form_Load; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private //////////////////////////////////////////////////////////////////////////////// Event #region 폼 로드시 처리하기 - Form_Load(sender, e) /// <summary> /// 폼 로드시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void Form_Load(object sender, EventArgs e) { using(SQLiteConnection connection = SQLiteHelper.GetConnection("Data Source=:memory:")) { connection.Open(); // 소스 테이블을 생성한다. SQLiteHelper.Execute(connection, CREATE_SOURCE_TABLE_SQL); // 소스 테이블에 데이터를 추가한다. InsertSourceTableData(connection); // 행 컬럼명 리스트를 설정한다. List<string> rowColumnNameList = SQLiteHelper.GetStringList("MANAGER"); // 컬럼 컬럼 값 리스트를 설정한다. DataTable columnColumnValueTable = SQLiteHelper.GetDataTable(connection, SELECT_COLUMN_COLUMN_VALUE_SQL); List<string> columnColumnValueList = SQLiteHelper.GetStringList(columnColumnValueTable, "SALES_MONTH"); // 정렬 컬럼명 리스트를 설정한다. List<string> orderByColumnNameList = SQLiteHelper.GetStringList("MANAGER"); // 피벗 합계 테이블을 생성한다. string pivotSummarySQL = SQLiteHelper.GetPivotSummarySQL("SOURCE_TABLE", rowColumnNameList, "SALES_MONTH", columnColumnValueList, "SALES_AMOUNT", orderByColumnNameList); SQLiteHelper.Execute(connection, "CREATE TABLE PIVOT_TABLE AS " + pivotSummarySQL); // 소스 테이블을 출력한다. DataTable sourceTable = SQLiteHelper.GetDataTable(connection, "SELECT * FROM SOURCE_TABLE"); // 소스 데이터 그리드 뷰에 소스 테이블을 바인딩 한다. this.sourceDataGridView.DataSource = sourceTable; // 피벗 테이블을 출력한다. DataTable pivotTable = SQLiteHelper.GetDataTable(connection, "SELECT * FROM PIVOT_TABLE"); // 피벗 데이터 그리드 뷰에 피벗 테이블을 바인딩 한다. this.pivotDataGridView.DataSource = pivotTable; } } #endregion //////////////////////////////////////////////////////////////////////////////// Function #region 소스 데이터 추가하기 - InsertSourceData(connection, lotWafer, tkinTime, stepSeq, subItemID, value) /// <summary> /// 소스 데이터 추가하기 /// </summary> /// <param name="connection">연결</param> /// <param name="lotWafer">LOT_WF</param> /// <param name="tkinTime">TKIN_TIME</param> /// <param name="stepSeq">STEP_SEQ</param> /// <param name="subItemID">SUB_ITEM_ID</param> /// <param name="value">VALUE</param> /// <returns>처리 행 수</returns> private int InsertSourceData(SQLiteConnection connection, string manager, string salesMonth, double salesAmount) { List<SQLiteParameter> parameterList = new List<SQLiteParameter>() { new SQLiteParameter { ParameterName = "@MANAGER" , DbType = DbType.String, Value = manager }, new SQLiteParameter { ParameterName = "@SALES_MONTH" , DbType = DbType.String, Value = salesMonth }, new SQLiteParameter { ParameterName = "@SALES_AMOUNT", DbType = DbType.Double, Value = salesAmount} }; int result = SQLiteHelper.Execute(connection, INSERT_SOURCE_TABLE_SQL, parameterList); return result; } #endregion #region 소스 테이블 데이터 추가하기 - InsertSourceTableData(connection) /// <summary> /// 소스 테이블 데이터 추가하기 /// </summary> /// <param name="connection">연결</param> private void InsertSourceTableData(SQLiteConnection connection) { DateTime currentTime = DateTime.Now; InsertSourceData(connection, "홍길동", "01", 1000000); InsertSourceData(connection, "홍길동", "02", 1500000); InsertSourceData(connection, "홍길동", "03", 1000000); InsertSourceData(connection, "홍길동", "04", 2000000); InsertSourceData(connection, "홍길동", "05", 3000000); InsertSourceData(connection, "홍길동", "06", 1500000); InsertSourceData(connection, "홍길동", "07", 1000000); InsertSourceData(connection, "홍길동", "08", 1000000); InsertSourceData(connection, "홍길동", "09", 3000000); InsertSourceData(connection, "홍길동", "10", 4000000); InsertSourceData(connection, "홍길동", "11", 1000000); InsertSourceData(connection, "홍길동", "12", 1500000); InsertSourceData(connection, "김철수", "01", 500000); InsertSourceData(connection, "김철수", "02", 1500000); InsertSourceData(connection, "김철수", "03", 2000000); InsertSourceData(connection, "김철수", "04", 2500000); InsertSourceData(connection, "김철수", "05", 1000000); InsertSourceData(connection, "김철수", "06", 2500000); InsertSourceData(connection, "김철수", "07", 1500000); InsertSourceData(connection, "김철수", "08", 500000); InsertSourceData(connection, "김철수", "09", 500000); InsertSourceData(connection, "김철수", "10", 2000000); InsertSourceData(connection, "김철수", "11", 1000000); InsertSourceData(connection, "김철수", "12", 2500000); InsertSourceData(connection, "이영희", "01", 2500000); InsertSourceData(connection, "이영희", "02", 3500000); InsertSourceData(connection, "이영희", "03", 1000000); InsertSourceData(connection, "이영희", "04", 1500000); InsertSourceData(connection, "이영희", "05", 5000000); InsertSourceData(connection, "이영희", "06", 1500000); InsertSourceData(connection, "이영희", "07", 500000); InsertSourceData(connection, "이영희", "08", 500000); InsertSourceData(connection, "이영희", "09", 500000); InsertSourceData(connection, "이영희", "10", 500000); InsertSourceData(connection, "이영희", "11", 1000000); InsertSourceData(connection, "이영희", "12", 2000000); } #endregion } } |
▶ SQLiteHelper.cs
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using System.Collections.Generic; using System.Data; using System.Data.SQLite; using System.Text; namespace TestProject { /// <summary> /// SQLITE 헬퍼 /// </summary> public static class SQLiteHelper { //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Static //////////////////////////////////////////////////////////////////////////////// Public #region 연결 구하기 - GetConnection(connectionString) /// <summary> /// 연결 구하기 /// </summary> /// <param name="connectionString">연결 문자열</param> /// <returns>연결</returns> public static SQLiteConnection GetConnection(string connectionString) { SQLiteConnection connection = new SQLiteConnection(connectionString); return connection; } #endregion #region 명령 구하기 - GetCommand(connection) /// <summary> /// 명령 구하기 /// </summary> /// <param name="connection">연결</param> /// <returns>명령</returns> public static SQLiteCommand GetCommand(SQLiteConnection connection) { SQLiteCommand command = new SQLiteCommand(connection); return command; } #endregion #region 데이터 어댑터 구하기 - GetDataAdapter() /// <summary> /// 데이터 어댑터 구하기 /// </summary> /// <returns>데이터 어댑터</returns> public static SQLiteDataAdapter GetDataAdapter() { SQLiteDataAdapter dataAdapter = new SQLiteDataAdapter(); return dataAdapter; } #endregion #region 실행하기 - Execute(connection, commandText, parameterList) /// <summary> /// 실행하기 /// </summary> /// <param name="connection">연결</param> /// <param name="commandText">명령 텍스트</param> /// <param name="parameterList">매개 변수 리스트</param> /// <returns>처리 행 수</returns> public static int Execute(SQLiteConnection connection, string commandText, List<SQLiteParameter> parameterList = null) { using(SQLiteCommand command = GetCommand(connection)) { command.CommandText = commandText; if(parameterList != null) { foreach(SQLiteParameter parameter in parameterList) { command.Parameters.Add(parameter); } } int result = command.ExecuteNonQuery(); return result; } } #endregion #region 스칼라 실행하기 - ExecuteScalar(connection, commandText, parameterList) /// <summary> /// 스칼라 실행하기 /// </summary> /// <param name="connection">연결</param> /// <param name="commandText">명령 텍스트</param> /// <param name="parameterList">매개 변수 리스트</param> /// <returns>스칼라 값</returns> public static object ExecuteScalar(SQLiteConnection connection, string commandText, List<SQLiteParameter> parameterList = null) { using(SQLiteCommand command = GetCommand(connection)) { command.CommandText = commandText; if(parameterList != null) { foreach(SQLiteParameter parameter in parameterList) { command.Parameters.Add(parameter); } } object result = command.ExecuteScalar(); return result; } } #endregion #region 데이터 리더 실행하기 - ExecuteReader(connection, commandText, parameterList) /// <summary> /// 데이터 리더 실행하기 /// </summary> /// <param name="connection">연결</param> /// <param name="commandText">명령 텍스트</param> /// <param name="parameterList">매개 변수 리스트</param> /// <returns>데이터 리더</returns> public static SQLiteDataReader ExecuteDataReader(SQLiteConnection connection, string commandText, List<SQLiteParameter> parameterList = null) { using(SQLiteCommand command = GetCommand(connection)) { command.CommandText = commandText; if(parameterList != null) { foreach(SQLiteParameter parameter in parameterList) { command.Parameters.Add(parameter); } } SQLiteDataReader dataReader = command.ExecuteReader(); return dataReader; } } #endregion #region 데이터 테이블 구하기 - GetDataTable(connection, commandText, parameterList) /// <summary> /// 데이터 테이블 구하기 /// </summary> /// <param name="connection">연결</param> /// <param name="commandText">명령 텍스트</param> /// <param name="parameterList">매개 변수 리스트</param> /// <returns>데이터 테이블</returns> public static DataTable GetDataTable(SQLiteConnection connection, string commandText, List<SQLiteParameter> parameterList = null) { using(SQLiteCommand command = GetCommand(connection)) { command.CommandText = commandText; if(parameterList != null) { foreach(SQLiteParameter parameter in parameterList) { command.Parameters.Add(parameter); } } SQLiteDataAdapter dataAdapter = GetDataAdapter(); dataAdapter.SelectCommand = command; DataTable dataTable = new DataTable(); dataAdapter.Fill(dataTable); return dataTable; } } #endregion #region 문자열 리스트 구하기 - GetStringList(sourceArray) /// <summary> /// 문자열 리스트 구하기 /// </summary> /// <param name="sourceArray">소스 배열</param> /// <returns>문자열 리스트</returns> public static List<string> GetStringList(params string[] sourceArray) { List<string> list = new List<string>(); foreach(string source in sourceArray) { list.Add(source); } return list; } #endregion #region 문자열 리스트 구하기 - GetStringList(sourceTable, columnName) /// <summary> /// 리스트 구하기 /// </summary> /// <param name="sourceTable">소스 테이블</param> /// <param name="columnName">컬럼명</param> /// <returns>문자열 리스트</returns> public static List<string> GetStringList(DataTable sourceTable, string columnName) { List<string> list = new List<string>(); foreach(DataRow sourceRow in sourceTable.Rows) { list.Add(sourceRow[columnName].ToString()); } return list; } #endregion #region 피벗 합계 SQL 구하기 - GetPivotSummarySQL(tableName, rowColumnNameList, columnColumnName, columnColumnValueList, valueColumnName, orderByColumnNameList) /// <summary> /// 피벗 합계 SQL 구하기 /// </summary> /// <param name="tableName">테이블명</param> /// <param name="rowColumnNameList">행 컬럼명 리스트</param> /// <param name="columnColumnName">컬럼 컬럼명</param> /// <param name="columnColumnValueList">컬럼 컬럼 값 리스트</param> /// <param name="valueColumnName">값 컬럼명</param> /// <param name="orderByColumnNameList">정렬 컬럼명 리스트</param> /// <returns>피벗 SQL</returns> public static string GetPivotSummarySQL(string tableName, List<string> rowColumnNameList, string columnColumnName, List<string> columnColumnValueList, string valueColumnName, List<string> orderByColumnNameList) { string sql = @" SELECT [ROW_COLUMN_NAME_LIST] [COLUMN_COLUMN_VALUE_LIST] FROM [TABLE_NAME] GROUP BY [ROW_COLUMN_NAME_LIST] ORDER BY [ORDER_BY_COLUMN_NAME_LIST]; "; #region 행 컬럼명 문자열 빌더를 설정한다. StringBuilder rowColumnNameStringBuilder = new StringBuilder(); foreach(string column in rowColumnNameList) { rowColumnNameStringBuilder.AppendFormat("{0},", column); } #endregion #region 컬럼 컬럼 값 문자열 빌더를 설정한다. StringBuilder columnColumnValueStringBuilder = new StringBuilder(); foreach(string columnColumnValue in columnColumnValueList) { columnColumnValueStringBuilder.AppendFormat ( ",SUM(CASE WHEN [{0}] = '{1}' THEN {2} ELSE 0 END) AS [{1}]", columnColumnName, columnColumnValue, valueColumnName ); columnColumnValueStringBuilder.AppendLine(); } #endregion #region 정렬 컬럼명 문자열 빌더를 설정한다. StringBuilder orderByColumnNameStringBuilder = new StringBuilder(); foreach(string orderByColumnName in orderByColumnNameList) { orderByColumnNameStringBuilder.AppendFormat("{0},", orderByColumnName); } #endregion sql = sql.Replace("[ROW_COLUMN_NAME_LIST]" , rowColumnNameStringBuilder.ToString().TrimEnd(',') ); sql = sql.Replace("[COLUMN_COLUMN_VALUE_LIST]" , columnColumnValueStringBuilder.ToString() ); sql = sql.Replace("[TABLE_NAME]" , tableName ); sql = sql.Replace("[ORDER_BY_COLUMN_NAME_LIST]", orderByColumnNameStringBuilder.ToString().TrimEnd(',')); return sql; } #endregion #region 피벗 카운트 SQL 구하기 - GetPivotCountSQL(tableName, rowColumnNameList, columnColumnName, columnColumnValueList, orderByColumnNameList) /// <summary> /// 피벗 카운트 SQL 구하기 /// </summary> /// <param name="tableName">테이블명</param> /// <param name="rowColumnNameList">행 컬럼명 리스트</param> /// <param name="columnColumnName">컬럼 컬럼명</param> /// <param name="columnColumnValueTable">컬럼 컬럼 값 리스트</param> /// <param name="valueColumnName">값 컬럼명</param> /// <param name="valueFunctionName">값 함수명</param> /// <param name="orderByColumnNameList">정렬 컬럼명 리스트</param> /// <returns>피벗 SQL</returns> public static string GetPivotCountSQL(string tableName, List<string> rowColumnNameList, string columnColumnName, List<string> columnColumnValueList, List<string> orderByColumnNameList) { string sql = @" SELECT [ROW_COLUMN_NAME_LIST] [COLUMN_COLUMN_VALUE_LIST] FROM [TABLE_NAME] GROUP BY [ROW_COLUMN_NAME_LIST] ORDER BY [ORDER_BY_COLUMN_NAME_LIST]; "; #region 행 컬럼명 문자열 빌더를 설정한다. StringBuilder rowColumnNameStringBuilder = new StringBuilder(); foreach(string rowColumnName in rowColumnNameList) { rowColumnNameStringBuilder.AppendFormat("{0},", rowColumnName); } #endregion #region 컬럼 컬럼 값 문자열 빌더를 설정한다. StringBuilder columnColumnValueStringBuilder = new StringBuilder(); foreach(string columnColumnValue in columnColumnValueList) { columnColumnValueStringBuilder.AppendFormat(",SUM(CASE WHEN [{0}] = '{1}' THEN 1 ELSE 0 END) AS [{1}]", columnColumnName, columnColumnValue); columnColumnValueStringBuilder.AppendLine(); } #endregion #region 정렬 컬럼명 문자열 빌더를 설정한다. StringBuilder orderByColumnNameStringBuilder = new StringBuilder(); foreach(string orderByColumnName in orderByColumnNameList) { orderByColumnNameStringBuilder.AppendFormat("{0},", orderByColumnName); } #endregion sql = sql.Replace("[ROW_COLUMN_NAME_LIST]" , rowColumnNameStringBuilder.ToString().TrimEnd(',') ); sql = sql.Replace("[COLUMN_COLUMN_VALUE_LIST]" , columnColumnValueStringBuilder.ToString() ); sql = sql.Replace("[TABLE_NAME]" , tableName ); sql = sql.Replace("[ORDER_BY_COLUMN_NAME_LIST]", orderByColumnNameStringBuilder.ToString().TrimEnd(',')); return sql; } #endregion #region 피벗 평균 SQL 구하기 - GetPivotAverageSQL(summaryTableName, countTableName, rowColumnNameList, columnColumnValueList, orderByColumnNameList) /// <summary> /// 피벗 평균 SQL 구하기 /// </summary> /// <param name="summaryTableName">합계 테이블명</param> /// <param name="countTableName">카운트 테이블명</param> /// <param name="rowColumnNameList">행 컬럼명 리스트</param> /// <param name="columnColumnValueList">컬럼 컬럼 값 리스트</param> /// <param name="orderByColumnNameList">정렬 컬럼명 리스트</param> /// <returns>피벗 평균 SQL</returns> public static string GetPivotAverageSQL(string summaryTableName, string countTableName, List<string> rowColumnNameList, List<string> columnColumnValueList, List<string> orderByColumnNameList) { string sql = @" SELECT [ROW_COLUMN_NAME_LIST] [COLUMN_COLUMN_VALUE_LIST] FROM [SUMMARY_TABLE_NAME] A INNER JOIN [COUNT_TABLE_NAME] B ON [JOIN_CONDITION] ORDER BY [ORDER_BY_COLUMN_NAME_LIST]; "; #region 행 컬럼명 문자열 빌더를 설정한다. StringBuilder rowColumnNameStringBuilder = new StringBuilder(); foreach(string rowColumnName in rowColumnNameList) { rowColumnNameStringBuilder.AppendFormat("A.{0},", rowColumnName); } #endregion #region 컬럼 컬럼 값 문자열 빌더를 설정한다. StringBuilder columnColumnValueStringBuilder = new StringBuilder(); foreach(string columnColumnValue in columnColumnValueList) { columnColumnValueStringBuilder.AppendFormat(",CASE WHEN B.[{0}] <> 0 THEN A.[{0}] / B.[{0}] ELSE 0 END AS [{0}]", columnColumnValue); columnColumnValueStringBuilder.AppendLine(); } #endregion #region 조인 조건 문자열 빌더를 설정한다. StringBuilder joinConditionStringBuilder = new StringBuilder(); foreach(string rowColumnName in rowColumnNameList) { if(joinConditionStringBuilder.Length > 0) { joinConditionStringBuilder.Append(" AND "); } joinConditionStringBuilder.AppendFormat("B.{0} = A.{0}", rowColumnName); } #endregion #region 정렬 컬럼명 문자열 빌더를 설정한다. StringBuilder orderByColumnNameStringBuilder = new StringBuilder(); foreach(string orderByColumnName in orderByColumnNameList) { orderByColumnNameStringBuilder.AppendFormat("A.{0},", orderByColumnName); } #endregion sql = sql.Replace("[ROW_COLUMN_NAME_LIST]" , rowColumnNameStringBuilder.ToString().TrimEnd(',') ); sql = sql.Replace("[COLUMN_COLUMN_VALUE_LIST]" , columnColumnValueStringBuilder.ToString() ); sql = sql.Replace("[SUMMARY_TABLE_NAME]" , summaryTableName ); sql = sql.Replace("[COUNT_TABLE_NAME]" , countTableName ); sql = sql.Replace("[JOIN_CONDITION]" , joinConditionStringBuilder.ToString() ); sql = sql.Replace("[ORDER_BY_COLUMN_NAME_LIST]", orderByColumnNameStringBuilder.ToString().TrimEnd(',')); return sql; } #endregion } } |
TestProject.zip
■ SQLiteDataReader 클래스를 사용해 데이터를 조회하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "Data Source=c:\\test.db;Version=3" using(SQLiteConnection connection = new SQLiteConnection(connectionString)) { connection.Open(); string sql = "SELECT ID, Name, Grade FROM Student ORDER BY Name"; SQLiteCommand command = new SQLiteCommand(sql, connection); SQLiteDataReader reader = command.ExecuteReader(); while(reader.Read()) { Console.WriteLine("ID={0}, Name={1}, Grade={2}", reader["ID"], reader["Name"], reader["Grade"]); } } |
■ SQLite 32비트/64비트를 사용하는 방법을 보여준다. 1. SQLite DLL 파일들을 얻기 위해 임시로 비주얼 스튜디오에서 새로운 프로젝트를 생성한다. 2. 비주얼 스튜디오에서 "프로젝트
■ SQLiteCommand 클래스의 ExecuteNonQuery 메소드를 사용해 테이블을 삭제하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "URI=file:c:\\test.db"; using(SQLiteConnection sqliteConnection = new SQLiteConnection(connectionString)) { sqliteConnection.Open(); using(SQLiteCommand sqliteCommand = new SQLiteCommand(sqliteConnection)) { sqliteCommand.CommandText = "DROP TABLE IF EXISTS Cars"; sqliteCommand.ExecuteNonQuery(); } sqliteConnection.Close(); } |
■ SqliteCommand 클래스의 ExecuteNonQuery 메소드를 사용해 테이블을 생성하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "URI=file:c:\\test.db"; using(SQLiteConnection sqliteConnection = new SQLiteConnection(connectionString)) { sqliteConnection.Open(); using(SQLiteCommand sqliteCommand = new SQLiteCommand(sqliteConnection)) { sqliteCommand.CommandText = @"CREATE TABLE Cars(Id INTEGER PRIMARY KEY, Name TEXT, Price INT)"; sqliteCommand.ExecuteNonQuery(); } sqliteConnection.Close(); } |
■ SqliteCommand 클래스의 ExecuteNonQuery 메소드를 사용해 데이터를 추가하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "URI=file:c:\\test.db"; using(SQLiteConnection sqliteConnection = new SQLiteConnection(connectionString)) { sqliteConnection.Open(); using(SQLiteCommand sqliteCommand = new SQLiteCommand(sqliteConnection)) { sqliteCommand.CommandText = "INSERT INTO Cars VALUES(1,'Audi',52642)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(2,'Mercedes',57127)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(3,'Skoda',9000)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(4,'Volvo',29000)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(5,'Bentley',350000)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(6,'Citroen',21000)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(7,'Hummer',41400)"; sqliteCommand.ExecuteNonQuery(); sqliteCommand.CommandText = "INSERT INTO Cars VALUES(8,'Volkswagen',21600)"; sqliteCommand.ExecuteNonQuery(); } sqliteConnection.Close(); } |
■ 파일 데이터베이스를 사용하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "URI=file:c:\\test.db"; using(SQLiteConnection sqliteConnection = new SQLiteConnection(connectionString)) { sqliteConnection.Open(); // 데이터베이스 파일이 존재하지 않는 경우 생성한다. using(SQLiteCommand sqliteCommand = new SQLiteCommand(sqliteConnection)) { sqliteCommand.CommandText = "SELECT SQLite_VERSION()"; string version = Convert.ToString(sqliteCommand.ExecuteScalar()); Console.WriteLine("SQLite version : {0}", version); } sqliteConnection.Close(); } |
■ SQLite 버전을 구하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "Data Source=:memory:"; SQLiteConnection sqliteConnection = null; SQLiteCommand sqliteCommand = null; try { sqliteConnection = new SQLiteConnection(connectionString); sqliteConnection.Open(); string sql = "SELECT SQLITE_VERSION()"; sqliteCommand = new SQLiteCommand(sql, sqliteConnection); string version = sqliteCommand.ExecuteScalar().ToString(); Console.WriteLine("SQLite version : {0}", version); } catch(SQLiteException sqliteException) { Console.WriteLine("Error: {0}", sqliteException.ToString()); } finally { if(sqliteCommand != null) { sqliteCommand.Dispose(); } if(sqliteConnection != null) { try { sqliteConnection.Close(); } catch(SQLiteException sqliteException) { Console.WriteLine("Closing connection failed."); Console.WriteLine("Error: {0}", sqliteException.ToString()); } finally { sqliteConnection.Dispose(); } } } |
■ In-Memory 데이터베이스를 사용하는 방법을 보여준다. ▶ 예제 코드 (C#)
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using System; using System.Data.SQLite; string connectionString = "Data Source=:memory:"; SQLiteConnection sqliteConnection = null; SQLiteCommand sqliteCommand = null; try { sqliteConnection = new SQLiteConnection(connectionString); sqliteConnection.Open(); string sql = "SELECT SQLITE_VERSION()"; sqliteCommand = new SQLiteCommand(sql, sqliteConnection); string version = sqliteCommand.ExecuteScalar().ToString(); Console.WriteLine("SQLite version : {0}", version); } catch(SQLiteException sqliteException) { Console.WriteLine("Error: {0}", sqliteException.ToString()); } finally { if(sqliteCommand != null) { sqliteCommand.Dispose(); } if(sqliteConnection != null) { try { sqliteConnection.Close(); } catch(SQLiteException sqliteException) { Console.WriteLine("Closing connection failed."); Console.WriteLine("Error: {0}", sqliteException.ToString()); } finally { sqliteConnection.Dispose(); } } } |
■ SQLite를 사용하는 방법을 보여준다. 1. 컴포넌트 설치 • SQLite 1.0.67.2 Setup-VS2010-NET4.exe를 실행해 해당 컴포넌트를 설치한다. 2. 데이터베이스 생성 • SQLite DB를