四个常用的.NET的SQLHELPER方法实例

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
namespace SQL
{
public static class SqlHelper
{
/// <summary>
/// 创建连接的字符串
/// </summary>
static readonly string connStr=ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;

 

#region 1.0 执行查询语句，返回一个表 + static DataTable ExcuteTable(string sql, params SqlParameter[] ps)
/// <summary>
/// 1.0 执行查询语句，返回一个表
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="ps">参数数组</param>
/// <returns>返回一张表</returns>
public static DataTable ExcuteTable(string sql, params SqlParameter[] ps)
{
SqlDataAdapter da = new SqlDataAdapter(sql, connStr);
da.SelectCommand.Parameters.AddRange(ps);
DataTable dt = new DataTable();
da.Fill(dt);
return dt;
}
#endregion

#region 2.0 执行增删改的方法 + static int ExcuteNoQuery(string sql, params SqlParameter[] ps)
/// <summary>
/// 2.0 执行增删改的方法
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="ps">参数数组</param>
/// <returns>返回一条记录</returns>
public static int ExcuteNoQuery(string sql, params SqlParameter[] ps)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlCommand command = new SqlCommand(sql, conn);
command.Parameters.AddRange(ps);
return command.ExecuteNonQuery();
}
}
#endregion

#region 3.0 执行存储过程的方法 + static int ExcuteProc(string procName, params SqlParameter[] ps)
/// <summary>
/// 3.0 执行存储过程的方法
/// </summary>
/// <param name="procName">存储过程名</param>
/// <param name="ps">参数数组</param>
/// <returns></returns>
public static int ExcuteProc(string procName, params SqlParameter[] ps)
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlCommand command = new SqlCommand(procName, conn);
command.CommandType = CommandType.StoredProcedure;
command.Parameters.AddRange(ps);
return command.ExecuteNonQuery();
}
}
#endregion

#region 4.0 查询结果集，返回的是首行首列 + static int ExecScalar(string sql, params SqlParameter[] ps)
/// <summary>
/// 4.0 查询结果集，返回的是首行首列
/// </summary>
/// <param name="sql">sql语句</param>
/// <param name="ps">参数数组</param>
/// <returns></returns>
public static object ExecScalar(string sql, params SqlParameter[] ps) //调用的时候才判断是什么类型
{
using (SqlConnection conn = new SqlConnection(connStr))
{
conn.Open();
SqlCommand command = new SqlCommand(sql, conn);
command.Parameters.AddRange(ps);
return command.ExecuteScalar();
}
}
#endregion
}
}