Access操作类

3 C#代码操作步骤

（1） 命名空间

using System.Data.OleDb;

（2） 连接字符串

private staticstring connStr = @"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

注意：

a、DataSource = 数据库存放的路径（这里数据库放到了D盘目录下）

b、 2003版本的Access数据库链接字符串： privatestatic stringconnStr =@"Provider = Microsoft.Jet.OLEDB.4.0;DataSource = d:\login.mdb";

2007版本的Access数据库链接字符串：privatestaticstring connStr =@"Provider= Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

（3） 建立连接：

OleDbConnection tempconn =new OleDbConnection(connStr);

（4） 使用OleDbCommand类来执行Sql语句：

OleDbCommand cmd = new OleDbCommand(sql, tempconn);

tempconn.Open();

cmd.ExecuteNonQuery();

（5） 代码

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data.OleDb;

using System.Windows.Forms;

using System.Data;

namespace test

{

class AccessHelper

{

private static string connStr = @"Provider = Microsoft.Ace.OLEDB.12.0;Data Source = d:\login.accdb";

public static OleDbConnection GetConn()

{

OleDbConnection tempconn = new OleDbConnection(connStr);

MessageBox.Show(tempconn.DataSource);

tempconn.Open();

MessageBox.Show(tempconn.State.ToString());

return (tempconn);

}

/// <summary>

/// 执行增加、删除、修改指令

/// </summary>

/// <param name="sql">增加、删除、修改的sql语句</param>

/// <param name="param">sql语句的参数</param>

/// <returns></returns>

public static int ExecuteNonQuery(string sql, params OleDbParameter[] param)

{

using (OleDbConnection conn = new OleDbConnection(connStr))

{

using (OleDbCommand cmd = new OleDbCommand(sql,conn))

{

if (param != null)

{

cmd.Parameters.AddRange(param);

}

conn.Open();

return(cmd.ExecuteNonQuery());

}

}

}

/// <summary>

/// 执行查询指令，获取返回的首行首列的值

/// </summary>

/// <param name="sql">查询sql语句</param>

/// <param name="param">sql语句的参数</param>

/// <returns></returns>

public static object ExecuteScalar(string sql, params OleDbParameter[] param)

{

using (OleDbConnection conn = new OleDbConnection(connStr))

{

using (OleDbCommand cmd = new OleDbCommand(sql, conn))

{

if (param != null)

{

cmd.Parameters.AddRange(param);

}

conn.Open();

return (cmd.ExecuteScalar());

}

}

}

/// <summary>

/// 执行查询指令，获取返回的datareader

/// </summary>

/// <param name="sql">查询sql语句</param>

/// <param name="param">sql语句的参数</param>

/// <returns></returns>

public static OleDbDataReader ExecuteReader(string sql, params OleDbParameter[] param)

{

OleDbConnection conn = new OleDbConnection(connStr);

OleDbCommand cmd = conn.CreateCommand();

cmd.CommandText = sql;

cmd.CommandType = CommandType.Text;

if (param != null)

{

cmd.Parameters.AddRange(param);

}

conn.Open();

return (cmd.ExecuteReader(CommandBehavior.CloseConnection));

}

/// <summary>

/// 执行查询指令，获取返回datatable

/// </summary>

/// <param name="sql">查询sql语句</param>

/// <param name="param">sql语句的参数</param>

/// <returns></returns>

public static DataTable ExecuteDatable(string sql, params OleDbParameter[] param)

{

using (OleDbConnection conn = new OleDbConnection(connStr))

{

using (OleDbCommand cmd = new OleDbCommand(sql, conn))

{

if (param != null)

{

cmd.Parameters.AddRange(param);

}

DataTable dt = new DataTable();

OleDbDataAdapter sda = new OleDbDataAdapter(cmd);

sda.Fill(dt);

return (dt);

}

}

}

}

}