最简单的asp.net 操作 access 数据库方法
在asp.net中，使用C#操作access的mdb数据库，简单实用，只需要几步就可以实现。
1、新建一个asp.net网站，作为整个程序的表现层，里面的aspx文件可以调用其他层的项目。
2、建立一个数据库操作项目，命名为DBUtility，项目中只包含一个操作access数据库的类文件DbHelperOleDb.cs即可。
3、将网站引用DBUtility项目，这样，网站中的任何aspx网页都可以使用DbHelperOleDb.cs中的类。
DbHelperOleDb.cs中的类如下：
public class DbHelperOleDb
{
public string connectionString = "";
public DbHelperOleDb(stringconn)
{
this.connectionString = conn;
}
……………………………………………………
4、使用这个DbHelperOleDb类，要生成它的实例，其构造函数需要传入数据库链接字符串，例如：
string connStr = "Provider=Microsoft.Jet.OLEDB.4.0;DataSource=d:\\#gklq.mdb;Persist Security Info=False";
演示代码如下：
protected void Page_Load(objectsender, EventArgs e)
{
string connStr ="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=d:\\#gklq.mdb;PersistSecurity Info=False";
DbHelperOleDb op = newDbHelperOleDb(connStr); // 初始化实例，需要传入一个连接字符串
/****************************** 执行 一条简单sql语句 ***************************************/
op.ExecuteSql(" insert into art( kh,xm,xb,chj,zhy,shyd ) values('11111', '站战争','男' ,333 ,'计算机','山东' ) ");
/******************************执行事务 ***************************************/
string str1 = "insert into art( kh,xm,xb,chj,zhy,shyd )values( '2222222', '张思','男' ,333 ,'计算机','山东' )";
string str2 = "insert into art( kh,xm,xb,chj,zhy,shyd )values( '3333333', '张思','男' ,333 ,'计算机','山东' )";
ArrayList sqls = newArrayList();
sqls.Add(str1);sqls.Add(str2);
op.ExecuteSqlTran(sqls);
/****************************** 执行一条 带参数的sql语句 ***************************************/
string str = "insert into art( kh,xm,xb,chj,zhy,shyd )values( @kh,@xm,@xb,@chj,@zhy,@shyd )";
OleDbParameter[] paras = {
newOleDbParameter("@kh", OleDbType.VarChar, 50),
new OleDbParameter("@xm",OleDbType.VarChar, 50),
newOleDbParameter("@xb", OleDbType.VarChar, 50),
};
paras[0].Value = "730913";paras[1].Value = "里斯";paras[2].Value = "女";
int rows= op.ExecuteSql(str, paras);
}
下面是类文件DbHelperOleDb.cs完整代码：
using System;
using System.Collections;
using System.Collections.Specialized;
using System.Data;
using System.Data.OleDb;
namespace Maticsoft.DBUtility
{
///
/// 数据访问基础类(基于OleDb)
/// 可以用户可以修改满足自己项目的需要。
///
public class DbHelperOleDb
{
//数据库连接字符串(web.config来配置)，可以动态更改connectionString支持多数据库.
public string connectionString = "";
public DbHelperOleDb(string conn)
{
this.connectionString = conn;
}
#region 公用方法
public bool Exists(string strSql, params OleDbParameter[] cmdParms)
{
object obj = GetSingle(strSql, cmdParms);
int cmdresult;
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
cmdresult = 0;
}
else
{
cmdresult = int.Parse(obj.ToString());
}
if (cmdresult == 0)
{
return false;
}
else
{
return true;
}
}
#endregion
#region 执行简单SQL语句
///
/// 执行SQL语句，返回影响的记录数
///
/// SQL语句
///
public int ExecuteSql(string SQLString)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
{
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
connection.Close();
throw new Exception(E.Message);
}
}
}
}
///
/// 执行多条SQL语句，实现数据库事务。
///
/// 多条SQL语句
public void ExecuteSqlTran(ArrayList SQLStringList)
{
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
OleDbCommand cmd = new OleDbCommand();
cmd.Connection = conn;
OleDbTransaction tx = conn.BeginTransaction();
cmd.Transaction = tx;
try
{
for (int n = 0; n < SQLStringList.Count; n++)
{
string strsql = SQLStringList[n].ToString();
if (strsql.Trim().Length > 1)
{
cmd.CommandText = strsql;
cmd.ExecuteNonQuery();
}
}
tx.Commit();
}
catch (System.Data.OleDb.OleDbException E)
{
tx.Rollback();
throw new Exception(E.Message);
}
}
}
///
/// 执行带一个存储过程参数的的SQL语句。
///
/// SQL语句
/// 参数内容,比如一个字段是格式复杂的文章，有特殊符号，可以通过这个方式添加
///
public int ExecuteSql(string SQLString, string content)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand(SQLString, connection);
System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@content", OleDbType.VarChar);
myParameter.Value = content;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
/// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)
///
/// SQL语句
/// 图像字节,数据库的字段类型为image的情况
///
public int ExecuteSqlInsertImg(string strSQL, byte[] fs)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand(strSQL, connection);
System.Data.OleDb.OleDbParameter myParameter = new System.Data.OleDb.OleDbParameter("@fs", OleDbType.Binary);
myParameter.Value = fs;
cmd.Parameters.Add(myParameter);
try
{
connection.Open();
int rows = cmd.ExecuteNonQuery();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
throw new Exception(E.Message);
}
finally
{
cmd.Dispose();
connection.Close();
}
}
}
///
/// 执行一条计算查询结果语句，返回查询结果（object）。
///
/// 计算查询结果语句
///
public object GetSingle(string SQLString)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand(SQLString, connection))
{
try
{
connection.Open();
object obj = cmd.ExecuteScalar();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.OleDb.OleDbException e)
{
connection.Close();
throw new Exception(e.Message);
}
}
}
}
///
/// 执行查询语句，返回OleDbDataReader
///
/// 查询语句
///
public OleDbDataReader ExecuteReader(string strSQL)
{
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbCommand cmd = new OleDbCommand(strSQL, connection);
try
{
connection.Open();
OleDbDataReader myReader = cmd.ExecuteReader();
return myReader;
}
catch (System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
}
///
/// 执行查询语句，返回DataSet
///
/// 查询语句
///
public DataSet Query(string SQLString)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
DataSet ds = new DataSet();
try
{
connection.Open();
OleDbDataAdapter command = new OleDbDataAdapter(SQLString, connection);
command.Fill(ds, "ds");
}
catch (System.Data.OleDb.OleDbException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
#endregion
#region 执行带参数的SQL语句
///
/// 执行SQL语句，返回影响的记录数
///
/// SQL语句
///
public int ExecuteSql(string SQLString, params OleDbParameter[] cmdParms)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
int rows = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
return rows;
}
catch (System.Data.OleDb.OleDbException E)
{
throw new Exception(E.Message);
}
}
}
}
///
/// 执行多条SQL语句，实现数据库事务。
///
/// SQL语句的哈希表（key为sql语句，value是该语句的OleDbParameter[]）
public void ExecuteSqlTran(Hashtable SQLStringList)
{
using (OleDbConnection conn = new OleDbConnection(connectionString))
{
conn.Open();
using (OleDbTransaction trans = conn.BeginTransaction())
{
OleDbCommand cmd = new OleDbCommand();
try
{
//循环
foreach (DictionaryEntry myDE in SQLStringList)
{
string cmdText = myDE.Key.ToString();
OleDbParameter[] cmdParms = (OleDbParameter[])myDE.Value;
PrepareCommand(cmd, conn, trans, cmdText, cmdParms);
int val = cmd.ExecuteNonQuery();
cmd.Parameters.Clear();
trans.Commit();
}
}
catch
{
trans.Rollback();
throw;
}
}
}
}
///
/// 执行一条计算查询结果语句，返回查询结果（object）。
///
/// 计算查询结果语句
///
public object GetSingle(string SQLString, params OleDbParameter[] cmdParms)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
using (OleDbCommand cmd = new OleDbCommand())
{
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
object obj = cmd.ExecuteScalar();
cmd.Parameters.Clear();
if ((Object.Equals(obj, null)) || (Object.Equals(obj, System.DBNull.Value)))
{
return null;
}
else
{
return obj;
}
}
catch (System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
}
}
}
///
/// 执行查询语句，返回OleDbDataReader
///
/// 查询语句
///
public OleDbDataReader ExecuteReader(string SQLString, params OleDbParameter[] cmdParms)
{
OleDbConnection connection = new OleDbConnection(connectionString);
OleDbCommand cmd = new OleDbCommand();
try
{
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
OleDbDataReader myReader = cmd.ExecuteReader();
cmd.Parameters.Clear();
return myReader;
}
catch (System.Data.OleDb.OleDbException e)
{
throw new Exception(e.Message);
}
}
///
/// 执行查询语句，返回DataSet
///
/// 查询语句
///
public DataSet Query(string SQLString, params OleDbParameter[] cmdParms)
{
using (OleDbConnection connection = new OleDbConnection(connectionString))
{
OleDbCommand cmd = new OleDbCommand();
PrepareCommand(cmd, connection, null, SQLString, cmdParms);
using (OleDbDataAdapter da = new OleDbDataAdapter(cmd))
{
DataSet ds = new DataSet();
try
{
da.Fill(ds, "ds");
cmd.Parameters.Clear();
}
catch (System.Data.OleDb.OleDbException ex)
{
throw new Exception(ex.Message);
}
return ds;
}
}
}
private void PrepareCommand(OleDbCommand cmd, OleDbConnection conn, OleDbTransaction trans, string cmdText, OleDbParameter[] cmdParms)
{
if (conn.State != ConnectionState.Open)
conn.Open();
cmd.Connection = conn;
cmd.CommandText = cmdText;
if (trans != null)
cmd.Transaction = trans;
cmd.CommandType = CommandType.Text;//cmdType;
if (cmdParms != null)
{
foreach (OleDbParameter parm in cmdParms)
cmd.Parameters.Add(parm);
}
}
#endregion
}
}