Question

C#如何连接ACCESS数据库，并在里面去数据！！

Answer 1

using
System.Data;
using
System.Data.OleDb;
private
OleDbConnection
con;
///
<summary>
///
打开数据库连接
///
</summary>
///
<param
name="DBpath">数据库路径(包括数据库名)</param>
private
void
Open(String
DBpath)
{
if(con
==
null)
con
=
new
OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data
Source="
+
DBpath);
if
(con.State
==
ConnectionState.Closed)
con.Open();
}
///
<summary>
///
创建一个命令对象并返回该对象
///
</summary>
///
<param
name="sqlStr">数据库语句</param>
///
<param
name="file">数据库所在路径</param>
///
<returns>OleDbCommand</returns>
private
OleDbCommand
CreateCommand(string
sqlStr,
string
file)
{
Open(file);
OleDbCommand
cmd
=
new
OleDbCommand();
cmd.CommandType
=
CommandType.Text;
cmd.CommandText
=
sqlStr;
cmd.Connection
=
con;
return
cmd;
}
///
<summary>
///
执行
///
</summary>
///
<param
name="sqlStr">SQL语句</param>
///
<param
name="file">数据库所在路径</param>
///
<returns>返回数值当执行成功时候返回true,失败则返回false</returns>
public
bool
ExecuteNonQury(string
sqlStr,
string
file)
{
OleDbCommand
cmd
=
CreateCommand(sqlStr,
file);
int
result
=
cmd.ExecuteNonQuery();
if
(result
==
-1
|
result
==
0)
{
cmd.Dispose();
Close();
return
false;
}
else
{
cmd.Dispose();
Close();
return
true;
}
///
<summary>
///
执行数据库查询
///
</summary>
///
<param
name="sqlStr">查询语句</param>
///
<param
name="tableName">填充数据集表格的名称</param>
///
<param
name="file">数据库所在路径</param>
///
<returns>查询的数据集</returns>
public
DataSet
GetDataSet(string
sqlStr,
string
file)
{
DataSet
ds
=
new
DataSet();
OleDbCommand
cmd
=
CreateCommand(sqlStr,
file);
OleDbDataAdapter
dataAdapter
=
new
OleDbDataAdapter(cmd);
dataAdapter.Fill(ds);
cmd.Dispose();
Close();
dataAdapter.Dispose();
return
ds;
}
///
<summary>
///
生成一个数据读取器OleDbDataReader并返回该OleDbDataReader
///
</summary>
///
<param
name="sqlStr">数据库查询语句</param>
///
<returns>返回一个DataReader对象</returns>
public
OleDbDataReader
GetReader(string
sqlStr,
string
file)
{
OleDbCommand
cmd
=
CreateCommand(sqlStr,
file);
OleDbDataReader
reader
=
cmd.ExecuteReader(CommandBehavior.CloseConnection);
//CommadnBehavior.CloseConnection是将于DataReader的数据库链接关联起来
//当关闭DataReader对象时候也自动关闭链接
return
reader;
}
///
<summary>
///
关闭数据库
///
</summary>
public
void
Close()
{
if
(con
!=
null)
con.Close();
con
=
null;
}
传进来的路径是带上Access数据库名的