C# DBHelper 第二版

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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();         }       } }