using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data.SQLite;using System.Data;using System.Data.Common;namespace IcoLync.Data.HistroyMessage{ /// <summary> /// 本类为SQLite数据库帮助类 /// 轻量级数据库SQLite的连接字符串写法："Data Source=D:\database\test.s3db" /// 轻量级数据库SQLite的加密后的连接字符串写法："Data Source=Maximus.db;Version=3;Password=myPassword;" /// </summary> public class SqliteHelper { //数据库连接字符串 private readonly string _conn = string.Empty; public SqliteHelper(string connectionString) { _conn = connectionString; } public bool CreatDB() { try { string strSql = "CREATE TABLE [tblHistoryMessage] ([RecID] INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, [ConversationID] nvarchar(100), [FromUri] nvarchar(50), [ToUri] nvarchar(50), [SendDT] datetime, [MessageText] text, [FromUriName] nvarchar(50), [ToUriName] nvarchar(50));"; ExecuteNonQuery(strSql, CommandType.Text); return true; } catch (Exception ex) { return false; } } #region ExecuteNonQuery /// <summary> /// 执行数据库操作(新增、更新或删除) /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmd">SqlCommand对象</param> /// <returns>所受影响的行数</returns> public int ExecuteNonQuery(SQLiteCommand cmd) { int result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText); try { result = cmd.ExecuteNonQuery(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } /// <summary> /// 执行数据库操作(新增、更新或删除) /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <returns>所受影响的行数</returns> public int ExecuteNonQuery(string commandText, CommandType commandType) { int result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, commandType, commandText); try { result = cmd.ExecuteNonQuery(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } /// <summary> /// 执行数据库操作(新增、更新或删除) /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <param name="cmdParms">SQL参数对象</param> /// <returns>所受影响的行数</returns> public int ExecuteNonQuery(string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { int result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, commandType, commandText, cmdParms); try { result = cmd.ExecuteNonQuery(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } #endregion #region ExecuteScalar /// <summary> /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmd">SqlCommand对象</param> /// <returns>查询所得的第1行第1列数据</returns> public object ExecuteScalar(SQLiteCommand cmd) { object result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, cmd.CommandType, cmd.CommandText); try { result = cmd.ExecuteScalar(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } /// <summary> /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <returns>查询所得的第1行第1列数据</returns> public object ExecuteScalar(string commandText, CommandType commandType) { object result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, commandType, commandText); try { result = cmd.ExecuteScalar(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } /// <summary> /// 执行数据库操作(新增、更新或删除)同时返回执行后查询所得的第1行第1列数据 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <param name="cmdParms">SQL参数对象</param> /// <returns>查询所得的第1行第1列数据</returns> public object ExecuteScalar(string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { object result = 0; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(_conn)) { SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, true, commandType, commandText); try { result = cmd.ExecuteScalar(); trans.Commit(); } catch (Exception ex) { trans.Rollback(); throw ex; } } return result; } #endregion #region ExecuteReader /// <summary> /// 执行数据库查询，返回SqlDataReader对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmd">SqlCommand对象</param> /// <returns>SqlDataReader对象</returns> public DbDataReader ExecuteReader(SQLiteCommand cmd) { DbDataReader reader = null; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); SQLiteConnection con = new SQLiteConnection(_conn); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText); try { reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception ex) { throw ex; } return reader; } /// <summary> /// 执行数据库查询，返回SqlDataReader对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <returns>SqlDataReader对象</returns> public DbDataReader ExecuteReader(string commandText, CommandType commandType) { DbDataReader reader = null; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteConnection con = new SQLiteConnection(_conn); SQLiteCommand cmd = new SQLiteCommand(); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, commandType, commandText); try { reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception ex) { throw ex; } return reader; } /// <summary> /// 执行数据库查询，返回SqlDataReader对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <param name="cmdParms">SQL参数对象</param> /// <returns>SqlDataReader对象</returns> public DbDataReader ExecuteReader(string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { DbDataReader reader = null; if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); SQLiteConnection con = new SQLiteConnection(_conn); SQLiteCommand cmd = new SQLiteCommand(); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms); try { reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); } catch (Exception ex) { throw ex; } return reader; } #endregion #region ExecuteDataSet /// <summary> /// 执行数据库查询，返回DataSet对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="cmd">SqlCommand对象</param> /// <returns>DataSet对象</returns> public DataSet ExecuteDataSet(SQLiteCommand cmd) { DataSet ds = new DataSet(); SQLiteConnection con = new SQLiteConnection(_conn); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, cmd.CommandType, cmd.CommandText); try { SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd); sda.Fill(ds); } catch (Exception ex) { throw ex; } finally { if (cmd.Connection != null) { if (cmd.Connection.State == ConnectionState.Open) { cmd.Connection.Close(); } } } return ds; } /// <summary> /// 执行数据库查询，返回DataSet对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <returns>DataSet对象</returns> public DataSet ExecuteDataSet(string commandText, CommandType commandType) { if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); DataSet ds = new DataSet(); SQLiteConnection con = new SQLiteConnection(_conn); SQLiteCommand cmd = new SQLiteCommand(); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, commandType, commandText); try { SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd); sda.Fill(ds); } catch (Exception ex) { throw ex; } finally { if (con != null) { if (con.State == ConnectionState.Open) { con.Close(); } } } return ds; } /// <summary> /// 执行数据库查询，返回DataSet对象 /// </summary> /// <param name="connectionString">连接字符串</param> /// <param name="commandText">执行语句或存储过程名</param> /// <param name="commandType">执行类型</param> /// <param name="cmdParms">SQL参数对象</param> /// <returns>DataSet对象</returns> public DataSet ExecuteDataSet(string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { if (string.IsNullOrEmpty(_conn)) throw new ArgumentNullException("Connection string is missing."); if (string.IsNullOrEmpty(commandText)) throw new ArgumentNullException("commandText"); DataSet ds = new DataSet(); SQLiteConnection con = null; SQLiteCommand cmd = new SQLiteCommand(); SQLiteTransaction trans = null; try { con = new SQLiteConnection(_conn); PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms); SQLiteDataAdapter sda = new SQLiteDataAdapter(cmd); sda.Fill(ds); } catch (Exception ex) { throw ex; } finally { if (con != null) { if (con.State == ConnectionState.Open) { con.Close(); } } } return ds; } #endregion /// <summary> /// 通用分页查询方法 /// </summary> /// <param name="connString">连接字符串</param> /// <param name="tableName">表名</param> /// <param name="strColumns">查询字段名</param> /// <param name="strWhere">where条件</param> /// <param name="strOrder">排序条件</param> /// <param name="pageSize">每页数据数量</param> /// <param name="currentIndex">当前页数</param> /// <param name="recordOut">数据总量</param> /// <returns>DataTable数据表</returns> public DataTable SelectPaging(string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut) { DataTable dt = new DataTable(); //查询总数 string countSql = "select count(*) from " + tableName + " where {0}"; countSql = String.Format(countSql, strWhere); LogManager.Logger.Info(countSql); recordOut = Convert.ToInt32(ExecuteScalar(countSql, CommandType.Text)); //分页 string pagingTemplate = "select {0} from {1} where {2} order by {3} limit {4} offset {5} "; int offsetCount = (currentIndex - 1) * pageSize; string commandText = String.Format(pagingTemplate, strColumns, tableName, strWhere, strOrder, pageSize.ToString(), offsetCount.ToString()); using (DbDataReader reader = ExecuteReader(commandText, CommandType.Text)) { if (reader != null) { dt.Load(reader); } } return dt; } /// <summary> /// 预处理Command对象,数据库链接,事务,需要执行的对象,参数等的初始化 /// </summary> /// <param name="cmd">Command对象</param> /// <param name="conn">Connection对象</param> /// <param name="trans">Transcation对象</param> /// <param name="useTrans">是否使用事务</param> /// <param name="cmdType">SQL字符串执行类型</param> /// <param name="cmdText">SQL Text</param> /// <param name="cmdParms">SQLiteParameters to use in the command</param> private void PrepareCommand(SQLiteCommand cmd, SQLiteConnection conn, ref SQLiteTransaction trans, bool useTrans, CommandType cmdType, string cmdText, params SQLiteParameter[] cmdParms) { if (conn.State != ConnectionState.Open) conn.Open(); cmd.Connection = conn; cmd.CommandText = cmdText; if (useTrans) { trans = conn.BeginTransaction(IsolationLevel.ReadCommitted); cmd.Transaction = trans; } cmd.CommandType = cmdType; if (cmdParms != null) { foreach (SQLiteParameter parm in cmdParms) cmd.Parameters.Add(parm); } } }}
