C# DBHelper 第二版
1. [代码][C#]代码 跳至 [1] [全屏预览]
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/******************************** * Produce: DbHelper * Version: beta 2 * Date: 2012.10.11 ********************************/ using System; using System.Data; using System.Data.SqlClient; using System.Configuration; using System.Collections.Generic; namespace DbHelper { public class SqlDbHelper :IDisposable { protected SqlConnection conn; protected SqlCommand cmd; protected SqlDataReader reader; protected SqlDataAdapter adapter; protected string connectionString = ConfigurationManager.ConnectionStrings[ "connStr" ].ConnectionString; public static SqlDbHelper Instance = null ; public string ConnectionString { get { return this .connectionString; } set { this .connectionString = value; } } static SqlDbHelper() { SqlDbHelper.Instance = new SqlDbHelper(); } /// <summary> /// 获取一个未打开连接的SqlConnection对象 /// </summary> /// <returns>SqlConnection对象</returns> public SqlConnection GetConnection() { if (conn != null ) return this .conn; return this .conn = new SqlConnection(connectionString); } /// <summary> /// 使用连接字符串获取未打开连接SqlConnection对象 /// </summary> /// <param name="_connStr">连接字符串</param> /// <returns>SqlConnection对象</returns> public SqlConnection GetConnection( string _connStr) { if ( this .conn != null ) this .conn.ConnectionString = _connStr; else this .conn = new SqlConnection(_connStr); return this .conn; } /// <summary> /// 使用指定的Sql语句创建SqlCommand对象 /// </summary> /// <param name="sqlStr">Sql语句</param> /// <returns>SqlCommand对象</returns> private SqlCommand GetCommand( string sqlStr) { if ( this .conn == null ) this .conn = GetConnection(); if ( this .cmd == null ) this .cmd = this .GetCommand(sqlStr, CommandType.Text, null ); else { this .cmd.CommandText = sqlStr; this .cmd.CommandType = CommandType.Text; this .cmd.Parameters.Clear(); } return this .cmd; } /// <summary> /// 使用指定的Sql语句,CommandType,SqlParameter数组创建SqlCommand对象 /// </summary> /// <param name="sqlStr">Sql语句</param> /// <param name="type">命令类型</param> /// <param name="paras">SqlParameter数组</param> /// <returns>SqlCommand对象</returns> public SqlCommand GetCommand( string sqlStr, CommandType type, SqlParameter[] paras) { if (conn == null ) this .conn = this .GetConnection(); if (cmd == null ) this .cmd = conn.CreateCommand(); this .cmd.CommandType = type; this .cmd.CommandText = sqlStr; this .cmd.Parameters.Clear(); if (paras != null ) this .cmd.Parameters.AddRange(paras); return this .cmd; } /// <summary> /// 执行Sql语句返回受影响的行数 /// </summary> /// <param name="sqlStr">Sql语句</param> /// <returns>受影响的行数,失败则返回-1</returns> public int ExecuteNonQuery( string sqlStr) { int line = -1; try { line = this .ExecuteNonQuery(sqlStr,CommandType.Text, null ); } catch (SqlException e) { throw e; } return line; } /// <summary> /// 使用指定的Sql语句,CommandType,SqlParameter数组执行Sql语句,返回受影响的行数 /// </summary> /// <param name="sqlStr">Sql语句</param> /// <param name="type">命令类型</param> /// <param name="paras">SqlParameter数组</param> /// <returns>受影响的行数</returns> public int ExecuteNonQuery( string sqlStr, CommandType type, SqlParameter[] paras) { int line = -1; CheckArgs(sqlStr); if ( this .cmd == null ) GetCommand(sqlStr, type, paras); this .cmd.Parameters.Clear(); this .cmd.CommandText = sqlStr; this .cmd.CommandType = type; if (paras != null ) this .cmd.Parameters.AddRange(paras); try { OpenConn(); line = this .cmd.ExecuteNonQuery(); } catch (SqlException e) { throw e; } return line; } /// <summary> /// 使用指定Sql语句获取dataTable /// </summary> /// <param name="sqlStr">Sql语句</param> /// <returns>DataTable对象</returns> public DataTable GetDataTable( string sqlStr) { CheckArgs(sqlStr); if ( this .conn == null ) this .conn = GetConnection(); this .adapter = new SqlDataAdapter(sqlStr, this .conn); DataTable table = new DataTable(); try { adapter.Fill(table); } catch (SqlException e) { throw e; } finally { this .adapter.Dispose(); } return table; } /// <summary> /// 使用指定的Sql语句获取SqlDataReader /// </summary> /// <param name="sqlStr">sql语句</param> /// <returns>SqlDataReader对象</returns> public SqlDataReader GetSqlDataReader( string sqlStr) { CheckArgs(sqlStr); if (cmd == null ) GetCommand(sqlStr); if (reader != null ) reader.Dispose(); try { OpenConn(); this .reader = this .cmd.ExecuteReader(); } catch (SqlException e) { throw e; } return this .reader; } /// <summary> /// 使用事务执行多条Sql语句 /// </summary> /// <param name="sqlCommands">sql语句数组</param> /// <returns>全部成功则返回true否则返回false</returns> public bool ExecuteSqls(List< string > sqlCommands) { if (sqlCommands == null ) throw new ArgumentNullException(); if (sqlCommands.Count == 0) throw new ArgumentOutOfRangeException(); if ( this .cmd == null ) GetCommand( null ); SqlTransaction tran = null ; try { OpenConn(); tran = this .conn.BeginTransaction(); this .cmd.Transaction = tran; foreach ( string sql in sqlCommands) { if (ExecuteNonQuery(sql) == 0) { tran.Rollback(); return false ; } } } catch { if (tran != null ) tran.Rollback(); throw ; } tran.Commit(); return true ; } public virtual void Dispose() { if ( this .reader != null ) { reader.Dispose(); this .reader = null ; } if ( this .cmd != null ) { this .cmd.Dispose(); this .cmd = null ; } if ( this .conn != null ) { this .conn.Dispose(); conn = null ; } } protected void OpenConn() { try { if ( this .conn.State != ConnectionState.Open) conn.Open(); } catch (SqlException e) { throw e; } } /// <summary> /// 关闭连接 /// </summary> public void CloseConn() { if ( this .conn != null && this .conn.State == ConnectionState.Open) this .conn.Close(); } /// <summary> /// 检查Sql语句是否合法 /// </summary> /// <param name="sqlStr">Sql语句</param> protected virtual void CheckArgs( string sqlStr) { if (sqlStr == null ) throw new ArgumentNullException(); if (sqlStr.Length == 0) throw new ArgumentOutOfRangeException(); } } } |