SQLite Helper Library For C#

SQLite這個精巧的小數據庫，無需安裝軟件，只需要一個System.Data.SQLite.DLL文件即可操作SQLite數據庫。SQLite是一個開源數據庫，現在已變得越來越流行，它的體積很小，被廣泛應用於各種不同類型的應用中。SQLite已經是世界上佈署得最廣泛的SQL數據庫引擎，被用在無以計數的桌面電腦應用中，還有消費電子設備中，如移動電話、掌上電腦和MP3播放器等。SQLite的源碼就放在公有領域（即WikiPedia的public domain)中。

 

 

using System; using System.Collections.Generic; using System.Text; using System.Web; using System.Configuration; using System.Data; using System.Data.SQLite; namespace DAL { public class Sqlite { /// <summary> /// 獲得連接對象 /// </summary> /// <returns></returns> public static SQLiteConnection GetSQLiteConnection() { return new SQLiteConnection("Data Source=" + System.Web.HttpContext.Current.Server.MapPath(System.Configuration.ConfigurationManager.AppSettings["db"].ToString())); } private static void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, string cmdText, params object[] p) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Parameters.Clear(); cmd.Connection = conn; cmd.CommandText = cmdText; cmd.CommandType = CommandType.Text; cmd.CommandTimeout = 30; if (p != null) { foreach (object parm in p) cmd.Parameters.AddWithValue(string.Empty, parm); //for (int i = 0; i < p.Length; i++) // cmd.Parameters[i].Value = p[i]; } } public static DataSet ExecuteDataset(string cmdText, params object[] p) { DataSet ds = new DataSet(); SQLiteCommand command = new SQLiteCommand(); using (SQLiteConnection connection = GetSQLiteConnection()) { PrepareCommand(command, connection, cmdText, p); SQLiteDataAdapter da = new SQLiteDataAdapter(command); da.Fill(ds); } return ds; } public static DataRow ExecuteDataRow(string cmdText, params object[] p) { DataSet ds = ExecuteDataset(cmdText, p); if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0) return ds.Tables[0].Rows[0]; return null; } /// <summary> /// 返回受影響的行數 /// </summary> /// <param name="cmdText">a</param> /// <param name="commandParameters">傳入的參數</param> /// <returns></returns> public static int ExecuteNonQuery(string cmdText, params object[] p) { SQLiteCommand command = new SQLiteCommand(); using (SQLiteConnection connection = GetSQLiteConnection()) { PrepareCommand(command, connection, cmdText, p); return command.ExecuteNonQuery(); } } /// <summary> /// 返回SqlDataReader對象 /// </summary> /// <param name="cmdText"></param> /// <param name="commandParameters">傳入的參數</param> /// <returns></returns> public static SQLiteDataReader ExecuteReader(string cmdText, params object[] p) { SQLiteCommand command = new SQLiteCommand(); SQLiteConnection connection = GetSQLiteConnection(); try { PrepareCommand(command, connection, cmdText, p); SQLiteDataReader reader = command.ExecuteReader(CommandBehavior.CloseConnection); return reader; } catch { connection.Close(); throw; } } /// <summary> /// 返回結果集中的第一行第一列，忽略其他行或列 /// </summary> /// <param name="cmdText"></param> /// <param name="commandParameters">傳入的參數</param> /// <returns></returns> public static object ExecuteScalar(string cmdText, params object[] p) { SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection connection = GetSQLiteConnection()) { PrepareCommand(cmd, connection, cmdText, p); return cmd.ExecuteScalar(); } } /// <summary> /// 分頁 /// </summary> /// <param name="recordCount"></param> /// <param name="pageIndex"></param> /// <param name="pageSize"></param> /// <param name="cmdText"></param> /// <param name="countText"></param> /// <param name="p"></param> /// <returns></returns> public static DataSet ExecutePager(ref int recordCount, int pageIndex, int pageSize, string cmdText, string countText, params object[] p) { if (recordCount < 0) recordCount = int.Parse(ExecuteScalar(countText, p).ToString()); DataSet ds = new DataSet(); SQLiteCommand command = new SQLiteCommand(); using (SQLiteConnection connection = GetSQLiteConnection()) { PrepareCommand(command, connection, cmdText, p); SQLiteDataAdapter da = new SQLiteDataAdapter(command); da.Fill(ds, (pageIndex - 1) * pageSize, pageSize, "result"); } return ds; } } }