C# SQL数据库助手类1.0（自用）

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;

namespace Erp.DBUtility
{
public class YSqlHelper
{
//Sql连接语句
private static string connectionString = ConfigurationManager.AppSettings["ConnectionString"];

/// <summary>执行不带参数的增删改SQL语句或存储过程 ，返回受影响的行数</summary>
public static int ExecuteNonQuery(string cmdText, CommandType ct)
{
int res = 0;//受影响的行数
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
res = cmd.ExecuteNonQuery();//执行Sql语句并受影响的行数
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return res;
}

/// <summary>  执行带参数的增删改SQL语句或存储过程，返回受影响的行数</summary>
public static int ExecuteNonQuery(string cmdText, SqlParameter[] paras, CommandType ct)
{
int res = 0;//受影响的行数
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
res = cmd.ExecuteNonQuery();//执行Sql语句并受影响的行数
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return res;
}

/// <summary> 执行不带参数的查询SQL语句或存储过程，返回DataTable对象</summary>
public static DataTable ExecuteQueryDataTable(string cmdText, CommandType ct)
{
DataTable dt = new DataTable();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
using (SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return dt;
}

/// <summary> 执行带参数的查询SQL语句或存储过程，返回DataTable对象</summary>
public static DataTable ExecuteQueryDataTable(string cmdText, SqlParameter[] paras, CommandType ct)
{
DataTable dt = new DataTable();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
using (SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return dt;
}

/// <summary> 执行不带参数的查询SQL语句或存储过程，返回DataSet对象</summary>
public static DataSet ExecuteQueryDataSet(string cmdText, CommandType ct)
{
DataSet ds = new DataSet();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
da.Fill(ds, "ds");
}
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return ds;
}

/// <summary> 执行带参数的查询SQL语句或存储过程，返回DataSet对象</summary>
public static DataSet ExecuteQueryDataSet(string cmdText, SqlParameter[] paras, CommandType ct)
{
DataSet ds = new DataSet();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();//打开数据库链接
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
using (SqlDataAdapter da = new SqlDataAdapter(cmd))
{
da.Fill(ds, "ds");
}
}
}
catch
{

}
finally
{
if (conn.State == ConnectionState.Open)//判断连接是否处于打开状态
{
conn.Close();//关闭与数据库的链接
}
}
}
return ds;
}

/// <summary>查询数据是否存在</summary>
public static bool ExecuteDataIsExistByData(string sqlStr, CommandType commandType)
{
bool iss = false;
DataSet ds = ExecuteQueryDataSet(sqlStr, commandType);
for (int i = 0; i < ds.Tables.Count; i++)
{
if (ds.Tables[i].Rows.Count > 0) iss = true;
}
return iss;
}

/// <summary>查询数据是否存在 </summary>
public static bool ExecuteDataIsExistByData(string sqlStr, SqlParameter[] paras, CommandType commandType)
{
bool iss = false;
DataSet ds = ExecuteQueryDataSet(sqlStr, paras, commandType);
for (int i = 0; i < ds.Tables.Count; i++)
{
if (ds.Tables[i].Rows.Count > 0) iss = true;
}
return iss;
}
/// <summary>查询增删改数据操作是否成功 </summary>
public static bool ExecuteDataIsExistByInt(string sqlStr, CommandType commandType)
{
int ds = ExecuteNonQuery(sqlStr, commandType);
bool iss = ds > 0 ? true : false;
return iss;
}
/// <summary>查询增删改数据操作是否成功 </summary>
public static bool ExecuteDataIsExistByInt(string sqlStr, SqlParameter[] paras, CommandType commandType)
{
int ds = ExecuteNonQuery(sqlStr, paras, commandType);
bool iss = ds > 0 ? true : false;
return iss;
}
}
}