DbHelper类
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using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Data.SqlClient;using System.Linq;using System.Text;using System.Threading.Tasks;namespace Helper{ public class DbHelper { string strConn = null; public DbHelper(string connString) { this.strConn = connString; } //连接字符串 #region 执行查询，返回DataTable对象 public DataTable GetTable(string strSQL) { return GetTable(strSQL, null); } public 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 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; } public DataTable GetTable(String sql, int pageIndex, int pageSize, String order) { StringBuilder sb = new StringBuilder(); sb.Append("select * from( select ROW_NUMBER() over(order by page__Index) as rowNumber,* from ("); sb.Append("select *,0 as page__Index from (" + sql + ") as alawliet"); sb.Append(" ) as t ) as t2"); sb.Append(" where rowNumber between " + (((pageIndex - 1) * pageSize) + 1) + " and " + pageIndex * pageSize + " "); sb.Append(order); var dt = GetTable(sb.ToString()); dt.Columns.Remove("rowNumber"); return dt; } #endregion #region 执行查询，返回DataSet对象------------------------- public DataSet GetDataSet(string strSQL) { return GetDataSet(strSQL, null); } public 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 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 int ExcuteProc(string ProcName) { return ExcuteSQL(ProcName, null, CommandType.StoredProcedure); } public int ExcuteProc(string ProcName, SqlParameter[] pars) { return ExcuteSQL(ProcName, pars, CommandType.StoredProcedure); } public int ExcuteSQL(string strSQL) { int count = ExcuteSQL(strSQL, null); return count; } public 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 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 int ExcuteScalarSQL(string strSQL) { return ExcuteScalarSQL(strSQL, null); } public int ExcuteScalarSQL(string strSQL, SqlParameter[] paras) { return ExcuteScalarSQL(strSQL, paras, CommandType.Text); } public 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 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 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 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 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 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 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 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 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 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 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 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 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 }} var helper = new DbHelper(connString);
// 使用helper
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