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.OleDb;
//添加引用
using System.Web;
namespace xxxDAL
{
public class DBHelper
{
//引导<a href="http://lib.csdn.net/base/mysql" class='replace_word' title="MySQL知识库" target='_blank' style='color:#df3434; font-weight:bold;'>数据库</a>连接数据库调用Web.Config文件
private static OleDbConnection connection;
private static String constr = System.Configuration.ConfigurationManager.AppSettings[
"provider"].ToString() + System.Web.HttpContext.Current.Server.MapPath(ConfigurationManager.AppSettings[
"dbPath"]) +
";";
//创建连接|DataDirectory|/SchoolDB.mdb
public static OleDbConnection Connection
{
get
{
OleDbConnection myConn =
new OleDbConnection(constr);
string connectionString =
myConn.ConnectionString;
if (connection ==
null)
{
connection =
new OleDbConnection(connectionString);
//打开连接
connection.Open();
}
else if (connection.State ==
System.Data.ConnectionState.Closed)
{
connection.Open();
}
else if (connection.State ==
System.Data.ConnectionState.Broken)
{
connection.Close();
connection.Open();
}
return connection;
}
}
//（无参）返回执行的行数(删除修改更新)
public static int ExuteCommand(
string safeSql)
{
OleDbCommand cmd =
new OleDbCommand(safeSql, Connection);
int result =
cmd.ExecuteNonQuery();
return result;
}
//（有参）
public static int ExuteCommand(
string sql,
params OleDbParameter[] values)
{
OleDbCommand cmd =
new OleDbCommand(sql, Connection);
cmd.Parameters.AddRange(values);
return cmd.ExecuteNonQuery();
}
//（无参）返回第一行第一列(删除修改更新)
public static int GetScalar(
string safeSql)
{
OleDbCommand cmd =
new OleDbCommand(safeSql, Connection);
int result =
Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
//（有参）
public static int GetScalar(
string sql,
params OleDbParameter[] values)
{
OleDbCommand cmd =
new OleDbCommand(sql, Connection);
cmd.Parameters.AddRange(values);
int result =
Convert.ToInt32(cmd.ExecuteScalar());
return result;
}
//返回一个DataReader（查询）
public static OleDbDataReader GetReader(
string safeSql)
{
OleDbCommand cmd =
new OleDbCommand(safeSql, Connection);
OleDbDataReader reader =
cmd.ExecuteReader();
return reader;
}
public static OleDbDataReader GetReader(
string sql,
params OleDbParameter[] values)
{
OleDbCommand cmd =
new OleDbCommand(sql, Connection);
cmd.Parameters.AddRange(values);
OleDbDataReader reader =
cmd.ExecuteReader();
return reader;
}
//返回一个DataTable
public static DataTable GetTable(
string safeSql)
{
DataSet ds =
new DataSet();
OleDbCommand cmd =
new OleDbCommand(safeSql, Connection);
OleDbDataAdapter da =
new OleDbDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[
0];
}
public static DataTable GetTable(
string sql,
params OleDbParameter[] values)
{
DataSet ds =
new DataSet();
OleDbCommand cmd =
new OleDbCommand(sql, Connection);
cmd.Parameters.AddRange(values);
OleDbDataAdapter da =
new OleDbDataAdapter(cmd);
da.Fill(ds);
return ds.Tables[
0];
}
}
}
web.config中需要添加
<add key=
"provider" value=
"Provider=Microsoft.Jet.OLEDB.4.0;data source="/>
<add key=
"dbPath" value=
"~/App_Data/xxx(你的数据库).mdb"/>
转载于:https://www.cnblogs.com/hongjiang/p/7418401.html
相关资源：自己寫的AccessDBHelper 代码
