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451 lines
17 KiB
451 lines
17 KiB
4 years ago
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using System;
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using System.Collections.Generic;
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using System.Data.SQLite;
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using System.Data;
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namespace Common.Data.SqlLite
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{
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/// <summary>
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/// 功能：SqlLite操作类
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/// 作者：王昊昇
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/// 时间：2012.2.8
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/// </summary>
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public class SqlLiteHelper : IDataHelper
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{
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/// <summary>
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/// 获取最后一条插入数据的自增主键值的查询语句
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/// </summary>
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public const string SELECT_IDENTITY_ID = "SELECT last_insert_rowid();";
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/// <summary>
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/// 获取本地时间部分语句
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/// </summary>
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public const string LOCAL_TIME_CMD = "DATETIME(CURRENT_TIMESTAMP,'LOCALTIME')";
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/// <summary>
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/// 处理命令
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/// </summary>
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/// <param name="conn">数据库连接</param>
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/// <param name="cmd">数据库命令对象</param>
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/// <param name="trans">事务对象</param>
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/// <param name="txt">命令</param>
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/// <param name="param">参数</param>
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private void PrepareCommand(SQLiteConnection conn, SQLiteCommand cmd,
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SQLiteTransaction trans, string txt, SQLiteParameter[] param)
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{
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cmd.Connection = conn;
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cmd.CommandText = txt;
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if (trans != null)
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{
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cmd.Transaction = trans;
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}
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cmd.CommandType = System.Data.CommandType.Text;
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if (param != null)
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{
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foreach (SQLiteParameter parm in param)
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{
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cmd.Parameters.Add(parm);
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}
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}
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}
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/// <summary>
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/// 打开连接
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/// </summary>
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/// <param name="connString">连接字符串</param>
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/// <returns>连接对象</returns>
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public System.Data.IDbConnection OpenConnection(string connString)
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{
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SQLiteConnection conn = new SQLiteConnection();
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conn.ConnectionString = connString;
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conn.Open();
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return conn;
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}
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/// <summary>
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/// 打开连接
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/// </summary>
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/// <param name="connStrBuilder">连接字符串生成器</param>
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/// <returns>连接对象</returns>
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public System.Data.IDbConnection OpenConnection(System.Data.Common.DbConnectionStringBuilder connStrBuilder)
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{
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SQLiteConnection conn = new SQLiteConnection();
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conn.ConnectionString = connStrBuilder.ToString();
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conn.Open();
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return conn;
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}
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/// <summary>
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/// 关闭连接
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/// </summary>
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/// <param name="conn">连接对象</param>
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public void CloseConnection(System.Data.IDbConnection conn)
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{
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if (conn.State == System.Data.ConnectionState.Open)
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{
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conn.Close();
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conn.Dispose();
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}
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conn = null;
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}
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/// <summary>
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/// 读取数据
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <returns>数据读取器</returns>
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public System.Data.IDataReader ExecuteReader(System.Data.IDbConnection conn, string sql)
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{
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using (SQLiteCommand cmd = new SQLiteCommand(sql, (SQLiteConnection)conn))
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{
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SQLiteDataReader reader = cmd.ExecuteReader();
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return reader;
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}
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}
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/// <summary>
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/// 读取数据，支持参数
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <param name="param">参数</param>
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/// <returns>数据读取器</returns>
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public System.Data.IDataReader ExecuteReader(System.Data.IDbConnection conn, string sql,
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params System.Data.IDataParameter[] param)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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PrepareCommand((SQLiteConnection)conn, cmd, null, sql,
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(SQLiteParameter[])param);
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SQLiteDataReader reader = cmd.ExecuteReader();
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cmd.Parameters.Clear();
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return reader;
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}
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}
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/// <summary>
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/// 执行带参数的更新语句，返回受影响行数
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/// </summary>
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/// <param name="conn">数据库连接</param>
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/// <param name="strSql">更新语句</param>
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/// <param name="param">参数列表</param>
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/// <returns>受影响行数</returns>
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public int ExecuteSql(System.Data.IDbConnection conn, string sql, params System.Data.IDataParameter[] param)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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PrepareCommand((SQLiteConnection)conn, cmd, null, sql,
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(SQLiteParameter[])param);
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int r = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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return r;
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}
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}
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/// <summary>
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/// 执行更新语句，返回受影响行数
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/// </summary>
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/// <param name="conn">数据库连接</param>
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/// <param name="strSql">更新语句</param>
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/// <returns>受影响行数</returns>
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public int ExecuteSql(System.Data.IDbConnection conn, string sql)
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{
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using (SQLiteCommand cmd = new SQLiteCommand(sql, (SQLiteConnection)conn))
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{
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return cmd.ExecuteNonQuery();
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}
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}
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/// <summary>
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/// 执行数据处理事务
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="list">执行语句列表</param>
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public void ExecuteSqlTran(System.Data.IDbConnection conn, List<string> list)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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cmd.Connection = (SQLiteConnection)conn;
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using (SQLiteTransaction trans = (SQLiteTransaction)conn.BeginTransaction())
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{
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cmd.Transaction = trans;
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foreach(var sql in list)
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{
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if (sql.Trim().Length > 0)
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{
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cmd.CommandText = sql;
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cmd.ExecuteNonQuery();
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}
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}
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trans.Commit();
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}
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}
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}
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/// <summary>
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/// 执行数据处理事务
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="table">执行语句列表</param>
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public void ExecuteSqlTran(System.Data.IDbConnection conn, System.Collections.Hashtable table)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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using (SQLiteTransaction trans = ((SQLiteConnection)conn).BeginTransaction())
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{
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foreach (System.Collections.DictionaryEntry de in table)
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{
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string txt = de.Key.ToString();
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SQLiteParameter[] param = (SQLiteParameter[])de.Value;
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PrepareCommand((SQLiteConnection)conn, cmd, trans, txt, param);
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int val = cmd.ExecuteNonQuery();
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cmd.Parameters.Clear();
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trans.Commit();
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}
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}
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}
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/// <summary>
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/// 执行查询语句，返回查询结果的第一行第一列的数据
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <returns>结果对象</returns>
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public object GetSingle(System.Data.IDbConnection conn, string sql)
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{
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using (SQLiteCommand cmd = new SQLiteCommand(sql, (SQLiteConnection)conn))
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{
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object obj = cmd.ExecuteScalar();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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}
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/// <summary>
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/// 执行带参数的查询语句，返回查询结果的第一行第一列的数据
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <param name="param">参数</param>
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/// <returns>结果对象</returns>
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public object GetSingle(System.Data.IDbConnection conn, string sql, params System.Data.IDataParameter[] param)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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PrepareCommand((SQLiteConnection)conn, cmd, null, sql,
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(SQLiteParameter[])param);
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object obj = cmd.ExecuteScalar();
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cmd.Parameters.Clear();
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if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
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{
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return null;
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}
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else
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{
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return obj;
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}
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}
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}
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/// <summary>
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/// 执行带参数的数据查询
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <param name="param">参数</param>
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/// <returns>数据集</returns>
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public System.Data.DataSet Query(System.Data.IDbConnection conn, string sql,
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params System.Data.IDataParameter[] param)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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PrepareCommand((SQLiteConnection)conn, cmd, null, sql,
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(SQLiteParameter[])param);
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using (SQLiteDataAdapter da = new SQLiteDataAdapter(cmd))
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{
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System.Data.DataSet ds = new System.Data.DataSet();
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da.Fill(ds, "ds");
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cmd.Parameters.Clear();
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return ds;
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}
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}
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}
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/// <summary>
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/// 执行数据查询
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <returns>数据集</returns>
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public System.Data.DataSet Query(System.Data.IDbConnection conn, string sql)
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{
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using (SQLiteCommand cmd = new SQLiteCommand(sql, (SQLiteConnection)conn))
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using (SQLiteDataAdapter command = new SQLiteDataAdapter(sql, (SQLiteConnection)conn))
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{
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System.Data.DataSet ds = new System.Data.DataSet();
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command.Fill(ds, "ds");
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return ds;
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}
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}
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/// <summary>
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/// 执行数据查询
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <returns>数据表</returns>
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public System.Data.DataTable QueryReturnDataTable(System.Data.IDbConnection conn, string sql)
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{
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using (SQLiteCommand cmd = new SQLiteCommand(sql, (SQLiteConnection)conn))
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using (SQLiteDataAdapter command = new SQLiteDataAdapter(sql, (SQLiteConnection)conn))
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{
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System.Data.DataTable dt = new System.Data.DataTable();
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command.Fill(dt);
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return dt;
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}
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}
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/// <summary>
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/// 执行数据查询
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="sql">查询语句</param>
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/// <param name="param">参数</param>
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/// <returns>数据表</returns>
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public System.Data.DataTable QueryReturnDataTable(System.Data.IDbConnection conn, string sql,
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params System.Data.IDataParameter[] param)
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{
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using (SQLiteCommand cmd = new SQLiteCommand())
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{
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PrepareCommand((SQLiteConnection)conn, cmd, null, sql,
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(SQLiteParameter[])param);
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using (SQLiteDataAdapter command = new SQLiteDataAdapter(cmd))
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{
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System.Data.DataTable dt = new System.Data.DataTable();
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command.Fill(dt);
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cmd.Parameters.Clear();
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return dt;
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}
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}
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}
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/// <summary>
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/// 构建 SQLiteCommand 对象(用来返回一个结果集，而不是一个整数值)
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="storedProcName">存储过程名</param>
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/// <param name="parameters">存储过程参数</param>
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/// <returns></returns>
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private SQLiteCommand BuildQueryCommand(System.Data.IDbConnection conn, string storedProcName, IDataParameter[] param)
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{
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SQLiteCommand command = new SQLiteCommand(storedProcName, (SQLiteConnection)conn);
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command.CommandType = System.Data.CommandType.StoredProcedure;
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foreach (SQLiteParameter parameter in param)
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{
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command.Parameters.Add(parameter);
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}
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return command;
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}
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/// <summary>
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/// 执行带返回值存储过程
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/// </summary>
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/// <param name="conn">连接对象</param>
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/// <param name="storedProcName">存储过程名</param>
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/// <param name="parameters">存储过程参数</param>
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/// <param name="RowsAffected">受影响行数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
private DataTable ExecutePageStoredProcedure(System.Data.IDbConnection conn, string storedProcName,
|
||
|
|
IDataParameter[] parameters, out int rowsAffected)
|
||
|
|
{
|
||
|
|
SQLiteParameter OutParameters = new SQLiteParameter("@RowsAffected", DbType.Int32, 4, ParameterDirection.Output,
|
||
|
|
false, 0, 0, string.Empty, DataRowVersion.Default, null);
|
||
|
|
using (DataSet dataSet = new DataSet())
|
||
|
|
{
|
||
|
|
using (SQLiteCommand command = BuildQueryCommand(conn, storedProcName, parameters))
|
||
|
|
{
|
||
|
|
command.Parameters.Add(OutParameters);
|
||
|
|
using (SQLiteDataAdapter sqlDA = new SQLiteDataAdapter())
|
||
|
|
{
|
||
|
|
sqlDA.SelectCommand = command;
|
||
|
|
sqlDA.Fill(dataSet);
|
||
|
|
}
|
||
|
|
rowsAffected = Convert.ToInt32(command.Parameters["@RowsAffected"].Value);
|
||
|
|
}
|
||
|
|
return dataSet.Tables[0].Copy();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// 分页处理，取DataTable
|
||
|
|
/// 使用PagingQuery分页存储过程
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="conn">连接对象</param>
|
||
|
|
/// <param name="tableName">表名</param>
|
||
|
|
/// <param name="keyFieldName">以哪几列作为排序依据,多列以","分隔</param>
|
||
|
|
/// <param name="columnList">字段列表，取表中的列，以","分隔，取全部数据使用"*"</param>
|
||
|
|
/// <param name="where">查询条件</param>
|
||
|
|
/// <param name="orderBy">排序方式</param>
|
||
|
|
/// <param name="rowsAmountPerPage">每页记录数</param>
|
||
|
|
/// <param name="pageIndex">指定页索引</param>
|
||
|
|
/// <param name="pageConut">返回总页数</param>
|
||
|
|
/// <param name="rowsAffected">返回总记录数</param>
|
||
|
|
/// <returns></returns>
|
||
|
|
public System.Data.DataTable PagingQuery(System.Data.IDbConnection conn, string tableName, string keyFieldName, string columnList, string where,
|
||
|
|
OrderBy orderBy, int rowsAmountPerPage, int pageIndex, out int pageConut, out int rowsAffected)
|
||
|
|
{
|
||
|
|
int intRowsAffected = 0;
|
||
|
|
|
||
|
|
SQLiteParameter[] Parameters = { new SQLiteParameter("@TableName", DbType.String),
|
||
|
|
new SQLiteParameter("@FieldName", DbType.String),
|
||
|
|
new SQLiteParameter("@OrderBy", DbType.Byte),
|
||
|
|
new SQLiteParameter("@ColList", DbType.String),
|
||
|
|
new SQLiteParameter("@StrWhere", DbType.String),
|
||
|
|
new SQLiteParameter("@PageSize", DbType.Int32),
|
||
|
|
new SQLiteParameter("@PageIndex", DbType.Int32)};
|
||
|
|
|
||
|
|
Parameters[0].Value = tableName; // 表名
|
||
|
|
Parameters[1].Value = keyFieldName; // 按该列来分页
|
||
|
|
Parameters[2].Value = orderBy.GetHashCode(); // 排序
|
||
|
|
Parameters[3].Value = columnList; // 每页记录数
|
||
|
|
Parameters[4].Value = where; // 查询条件
|
||
|
|
Parameters[5].Value = rowsAmountPerPage; // 每页记录数
|
||
|
|
Parameters[6].Value = pageIndex; // 指定页
|
||
|
|
|
||
|
|
DataTable dt = ExecutePageStoredProcedure(conn, "P_Paging", Parameters, out intRowsAffected);
|
||
|
|
|
||
|
|
if (intRowsAffected % rowsAmountPerPage == 0)
|
||
|
|
{
|
||
|
|
pageConut = intRowsAffected / rowsAmountPerPage;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pageConut = intRowsAffected / rowsAmountPerPage + 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
rowsAffected = intRowsAffected;
|
||
|
|
|
||
|
|
return dt;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|