C#、SQL server数据库的连接、增、删、改、查等操作的类
using System;using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Data;
namespace vote
{
public> {
SqlConnection conn;
//构造连接对象
//string str = "server=HUZEWEI\\HUZEWEI;database=medicDB;uid=hzw;pwd=198211098";
public DataBase()
{
string str = "server=HUZEWEI\\HUZEWEI;database=medicDB;uid=hzw;pwd=198211098";
this.conn = new SqlConnection(str);
}
//打开连接
public void open()
{
if (conn.State == ConnectionState.Closed)
{
conn.Open();
}
}
//关闭当前连接
public void close()
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
//数据表dt
public DataTable query_dt(string sql)
{
close();
SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
DataTable dt=new DataTable();
sda.Fill(dt);
return dt;
}
//设置数据集ds
public DataSet query_ds(string sql)
{
close();
SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
DataSet ds = new DataSet();
sda.Fill(ds);
return ds;
}
//受影响的行数
public int update(string sql)
{
close();
open();
SqlCommand sc = new SqlCommand();
sc.CommandText = sql;
sc.CommandType = CommandType.Text;
sc.Connection = conn;
int x = sc.ExecuteNonQuery();
close();
return x;
}
//遍历表中的数据
public SqlDataReader sdread(string sql)
{
close();
SqlDataReader sdr;
open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
sdr = cmd.ExecuteReader();
return sdr;
}
//统计表的总数
public int sum(string sql)
{
close();
open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = sql;
cmd.CommandType = CommandType.Text;
int sum = Convert.ToInt32( cmd.ExecuteScalar());
close();
return sum;
}
//实例化sqldataadapter对象
public SqlDataAdapter sqlda(string sql)
{
SqlDataAdapter sda = new SqlDataAdapter(sql, conn);
return sda;
}
//更新数据的更改
public void tbupdate(SqlDataAdapter sda, DataTable dt)
{
sda.Fill(dt);
SqlCommandBuilder scb = new SqlCommandBuilder(sda);
//执行更新
sda.Update(dt.GetChanges());
//使DataTable保存更新
dt.AcceptChanges();
}
//登录密码加密
public string adpwd(string pwd)
{
string s1 = null;
for (int i = 0; i < pwd.Length; i++)
{
s1 += pwd;
}
return s1;
}
}
}
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