C#通用DBHelper类
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web.config:
<connectionStrings>
<add name="dh_web" connectionString="Data Source=xxx.com;Initial Catalog=xx_db;User ID=xx;Password=**;
pooling=true;max pool size=200" providerName="System.Data.SqlClient"/>
</connectionStrings>
DBHelper类：
using System;
using System.Collections.Generic;using System.Text;using System.Configuration;using System.Data;using System.Data.SqlClient;namespace DAL
{ public class SQLHelper { //连接字符串dh_web static string strConn = ConfigurationManager.ConnectionStrings["dh_web"].ToString();#region 执行查询，返回DataTable对象-----------------------
public static DataTable GetTable(string strSQL)
{ return GetTable(strSQL, null); } public static DataTable GetTable(string strSQL, SqlParameter[] pas) { return GetTable(strSQL, pas, CommandType.Text); } /// <summary> /// 执行查询，返回DataTable对象 /// </summary> /// <param name="strSQL">sql语句</param> /// <param name="pas">参数数组</param> /// <param name="cmdtype">Command类型</param> /// <returns>DataTable对象</returns> public static DataTable GetTable(string strSQL, SqlParameter[] pas, CommandType cmdtype) { DataTable dt = new DataTable(); ; using (SqlConnection conn = new SqlConnection(strConn)) { SqlDataAdapter da = new SqlDataAdapter(strSQL, conn); da.SelectCommand.CommandType = cmdtype; if (pas != null) { da.SelectCommand.Parameters.AddRange(pas); } da.Fill(dt); } return dt; }
#endregion
#region 执行查询，返回DataSet对象-------------------------
public static DataSet GetDataSet(string strSQL) { return GetDataSet(strSQL,null); }
public static DataSet GetDataSet(string strSQL, SqlParameter[] pas)
{ return GetDataSet(strSQL,pas,CommandType.Text); } /// <summary> /// 执行查询，返回DataSet对象 /// </summary> /// <param name="strSQL">sql语句</param> /// <param name="pas">参数数组</param> /// <param name="cmdtype">Command类型</param> /// <returns>DataSet对象</returns> public static DataSet GetDataSet(string strSQL, SqlParameter[] pas, CommandType cmdtype) { DataSet dt = new DataSet(); ; using (SqlConnection conn = new SqlConnection(strConn)) { SqlDataAdapter da = new SqlDataAdapter(strSQL, conn); da.SelectCommand.CommandType = cmdtype; if (pas != null) { da.SelectCommand.Parameters.AddRange(pas); } da.Fill(dt); } return dt; } #endregion
#region 执行非查询存储过程和SQL语句-----------------------------
public static int ExcuteProc(string ProcName) { return ExcuteSQL(ProcName, null, CommandType.StoredProcedure); }
public static int ExcuteProc(string ProcName, SqlParameter[] pars)
{ return ExcuteSQL(ProcName, pars, CommandType.StoredProcedure); }public static int ExcuteSQL(string strSQL)
{ return ExcuteSQL(strSQL, null); }public static int ExcuteSQL(string strSQL, SqlParameter[] paras)
{ return ExcuteSQL(strSQL, paras, CommandType.Text); }/// 执行非查询存储过程和SQL语句
/// 增、删、改 /// </summary> /// <param name="strSQL">要执行的SQL语句</param> /// <param name="paras">参数列表，没有参数填入null</param> /// <param name="cmdType">Command类型</param> /// <returns>返回影响行数</returns> public static int ExcuteSQL(string strSQL, SqlParameter[] paras, CommandType cmdType) { int i = 0; using (SqlConnection conn = new SqlConnection(strConn)) { SqlCommand cmd = new SqlCommand(strSQL, conn); cmd.CommandType = cmdType; if (paras != null) { cmd.Parameters.AddRange(paras); } conn.Open(); i = cmd.ExecuteNonQuery(); conn.Close(); } return i;}
#endregion
#region 执行查询返回第一行，第一列---------------------------------
public static int ExcuteScalarSQL(string strSQL) { return ExcuteScalarSQL(strSQL, null); }
public static int ExcuteScalarSQL(string strSQL, SqlParameter[] paras)
{ return ExcuteScalarSQL(strSQL, paras, CommandType.Text); } public static int ExcuteScalarProc(string strSQL, SqlParameter[] paras) { return ExcuteScalarSQL(strSQL, paras, CommandType.StoredProcedure); } /// <summary> /// 执行SQL语句，返回第一行，第一列 /// </summary> /// <param name="strSQL">要执行的SQL语句</param> /// <param name="paras">参数列表，没有参数填入null</param> /// <returns>返回影响行数</returns> public static int ExcuteScalarSQL(string strSQL, SqlParameter[] paras, CommandType cmdType) { int i = 0; using (SqlConnection conn = new SqlConnection(strConn)) { SqlCommand cmd = new SqlCommand(strSQL, conn); cmd.CommandType = cmdType; if (paras != null) { cmd.Parameters.AddRange(paras); } conn.Open(); i =Convert.ToInt32( cmd.ExecuteScalar()); conn.Close(); } return i;}
#endregion
#region 查询获取单个值------------------------------------
/// <summary> /// 调用不带参数的存储过程获取单个值 /// </summary> /// <param name="ProcName"></param> /// <returns></returns> public static object GetObjectByProc(string ProcName) { return GetObjectByProc(ProcName, null); } /// <summary> /// 调用带参数的存储过程获取单个值 /// </summary> /// <param name="ProcName"></param> /// <param name="paras"></param> /// <returns></returns> public static object GetObjectByProc(string ProcName, SqlParameter[] paras) { return GetObject(ProcName, paras, CommandType.StoredProcedure); } /// <summary> /// 根据sql语句获取单个值 /// </summary> /// <param name="strSQL"></param> /// <returns></returns> public static object GetObject(string strSQL) { return GetObject(strSQL,null); } /// <summary> /// 根据sql语句 和 参数数组获取单个值 /// </summary> /// <param name="strSQL"></param> /// <param name="paras"></param> /// <returns></returns> public static object GetObject(string strSQL, SqlParameter[] paras) { return GetObject(strSQL, paras, CommandType.Text); }
/// <summary>
/// 执行SQL语句，返回首行首列 /// </summary> /// <param name="strSQL">要执行的SQL语句</param> /// <param name="paras">参数列表，没有参数填入null</param> /// <returns>返回的首行首列</returns> public static object GetObject(string strSQL, SqlParameter[] paras,CommandType cmdtype) { object o = null; using (SqlConnection conn = new SqlConnection(strConn)) { SqlCommand cmd = new SqlCommand(strSQL, conn); cmd.CommandType = cmdtype; if (paras != null) { cmd.Parameters.AddRange(paras); } conn.Open(); o = cmd.ExecuteScalar(); conn.Close(); } return o;}
#endregion
#region 查询获取DataReader------------------------------------
/// <summary> /// 调用不带参数的存储过程，返回DataReader对象 /// </summary> /// <param name="procName">存储过程名称</param> /// <returns>DataReader对象</returns> public static SqlDataReader GetReaderByProc(string procName) { return GetReaderByProc(procName, null); } /// <summary> /// 调用带有参数的存储过程，返回DataReader对象 /// </summary> /// <param name="procName">存储过程名</param> /// <param name="paras">参数数组</param> /// <returns>DataReader对象</returns> public static SqlDataReader GetReaderByProc(string procName, SqlParameter[] paras) { return GetReader(procName, paras, CommandType.StoredProcedure); } /// <summary> /// 根据sql语句返回DataReader对象 /// </summary> /// <param name="strSQL">sql语句</param> /// <returns>DataReader对象</returns> public static SqlDataReader GetReader(string strSQL) { return GetReader(strSQL, null); } /// <summary> /// 根据sql语句和参数返回DataReader对象 /// </summary> /// <param name="strSQL">sql语句</param> /// <param name="paras">参数数组</param> /// <returns>DataReader对象</returns> public static SqlDataReader GetReader(string strSQL, SqlParameter[] paras) { return GetReader(strSQL, paras, CommandType.Text); } /// <summary> /// 查询SQL语句获取DataReader /// </summary> /// <param name="strSQL">查询的SQL语句</param> /// <param name="paras">参数列表，没有参数填入null</param> /// <returns>查询到的DataReader（关闭该对象的时候，自动关闭连接）</returns> public static SqlDataReader GetReader(string strSQL, SqlParameter[] paras,CommandType cmdtype) { SqlDataReader sqldr = null; SqlConnection conn = new SqlConnection(strConn); SqlCommand cmd = new SqlCommand(strSQL, conn); cmd.CommandType = cmdtype; if (paras != null) { cmd.Parameters.AddRange(paras); } conn.Open(); //CommandBehavior.CloseConnection的作用是如果关联的DataReader对象关闭，则连接自动关闭 sqldr = cmd.ExecuteReader(CommandBehavior.CloseConnection); return sqldr; }
#endregion
#region 批量插入数据---------------------------------------------
/// <summary> /// 往数据库中批量插入数据 /// </summary> /// <param name="sourceDt">数据源表</param> /// <param name="targetTable">服务器上目标表</param> public static void BulkToDB(DataTable sourceDt, string targetTable) { SqlConnection conn = new SqlConnection(strConn); SqlBulkCopy bulkCopy = new SqlBulkCopy(conn); //用其它源的数据有效批量加载sql server表中 bulkCopy.DestinationTableName = targetTable; //服务器上目标表的名称 bulkCopy.BatchSize = sourceDt.Rows.Count; //每一批次中的行数 try { conn.Open(); if (sourceDt != null && sourceDt.Rows.Count != 0) bulkCopy.WriteToServer(sourceDt); //将提供的数据源中的所有行复制到目标表中 } catch (Exception ex) { throw ex; } finally { conn.Close(); if (bulkCopy != null) bulkCopy.Close(); } }
#endregion
}}