C# SQLite数据库

2023-08-04 18:30:34

在客户端配置文件<configuration>节点下，添加：

<connectionStrings>
<add name="localdb" connectionString="Data Source=config/local.db;Version=3;UseUTF16Encoding=True;" providerName="System.Data.SQLite.SQLiteFactory"/>
</connectionStrings>

其中【localdb】是本地SQLite数据库的名称，【config/local.db】是在当前程序运行目录下SQLite数据库位置

C# SQLite数据库访问封装类代码：

/// <summary>
    /// 本类为SQLite数据库帮助静态类,使用时只需直接调用即可,无需实例化
    /// </summary>
    public static class SQLiteHelper
    {
        // Application.StartupPath
        public static string LocalDbConnectionString = ConfigurationManager.ConnectionStrings["localdb"].ConnectionString;
 
        #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 static int ExecuteNonQuery(string connectionString, SQLiteCommand cmd)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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 static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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 static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            int result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
 
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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;
        }
        #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 static object ExecuteScalar(string connectionString, SQLiteCommand cmd)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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 static object ExecuteScalar(string connectionString, string commandText, CommandType commandType)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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 static object ExecuteScalar(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            object result = 0;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
 
            SQLiteCommand cmd = new SQLiteCommand();
            using (SQLiteConnection con = new SQLiteConnection(connectionString))
            {
                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 static DbDataReader ExecuteReader(string connectionString, SQLiteCommand cmd)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
 
            SQLiteConnection con = new SQLiteConnection(connectionString);
            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 static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
 
            SQLiteConnection con = new SQLiteConnection(connectionString);
            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 static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            DbDataReader reader = null;
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
 
            SQLiteConnection con = new SQLiteConnection(connectionString);
            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 static DataSet ExecuteDataSet(string connectionString, SQLiteCommand cmd)
        {
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            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 static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            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 static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms)
        {
            if (connectionString == null || connectionString.Length == 0)
                throw new ArgumentNullException("connectionString");
            if (commandText == null || commandText.Length == 0)
                throw new ArgumentNullException("commandText");
            DataSet ds = new DataSet();
            SQLiteConnection con = new SQLiteConnection(connectionString);
            SQLiteCommand cmd = new SQLiteCommand();
            SQLiteTransaction trans = null;
            PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms);
            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;
        }
        #endregion
 
        #region 通用分页查询方法
        /// <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 static DataTable SelectPaging(string connString, string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut)
        {
            DataTable dt = new DataTable();
            recordOut = Convert.ToInt32(ExecuteScalar(connString, "select count(*) from " + tableName, CommandType.Text));
            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(connString, commandText, CommandType.Text))
            {
                if (reader != null)
                {
                    dt.Load(reader);
                }
            }
            return dt;
        }
        #endregion
 
        #region  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>
        /// 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 static 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);
            }
        }
 
        #endregion
    }

/// <summary> /// 本类为SQLite数据库帮助静态类,使用时只需直接调用即可,无需实例化 /// </summary> public static class SQLiteHelper { // Application.StartupPath public static string LocalDbConnectionString = ConfigurationManager.ConnectionStrings["localdb"].ConnectionString; #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 static int ExecuteNonQuery(string connectionString, SQLiteCommand cmd) { int result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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 static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType) { int result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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 static int ExecuteNonQuery(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { int result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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; } #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 static object ExecuteScalar(string connectionString, SQLiteCommand cmd) { object result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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 static object ExecuteScalar(string connectionString, string commandText, CommandType commandType) { object result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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 static object ExecuteScalar(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { object result = 0; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteCommand cmd = new SQLiteCommand(); using (SQLiteConnection con = new SQLiteConnection(connectionString)) { 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 static DbDataReader ExecuteReader(string connectionString, SQLiteCommand cmd) { DbDataReader reader = null; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); SQLiteConnection con = new SQLiteConnection(connectionString); 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 static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType) { DbDataReader reader = null; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteConnection con = new SQLiteConnection(connectionString); 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 static DbDataReader ExecuteReader(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { DbDataReader reader = null; if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); SQLiteConnection con = new SQLiteConnection(connectionString); 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 static DataSet ExecuteDataSet(string connectionString, SQLiteCommand cmd) { DataSet ds = new DataSet(); SQLiteConnection con = new SQLiteConnection(connectionString); 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 static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType) { if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); DataSet ds = new DataSet(); SQLiteConnection con = new SQLiteConnection(connectionString); 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 static DataSet ExecuteDataSet(string connectionString, string commandText, CommandType commandType, params SQLiteParameter[] cmdParms) { if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString"); if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText"); DataSet ds = new DataSet(); SQLiteConnection con = new SQLiteConnection(connectionString); SQLiteCommand cmd = new SQLiteCommand(); SQLiteTransaction trans = null; PrepareCommand(cmd, con, ref trans, false, commandType, commandText, cmdParms); 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; } #endregion #region 通用分页查询方法 /// <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 static DataTable SelectPaging(string connString, string tableName, string strColumns, string strWhere, string strOrder, int pageSize, int currentIndex, out int recordOut) { DataTable dt = new DataTable(); recordOut = Convert.ToInt32(ExecuteScalar(connString, "select count(*) from " + tableName, CommandType.Text)); 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(connString, commandText, CommandType.Text)) { if (reader != null) { dt.Load(reader); } } return dt; } #endregion #region 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> /// 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 static 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); } } #endregion }--------------------- 作者：衣舞晨风来源：CSDN 原文：https://blog.csdn.net/jiankunking/article/details/49423087 版权声明：本文为博主原创文章，转载请附上博文链接！

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