下面是以SQLServer为例编写一个简单的数据库连接工具类,把它封装到web项目的(WEB-INF/classes/)目录下,在Java或JSP页面引入就可以实现了.
ODBC名称:mysql;
用户名:dxaw;
密 码:123;
方法executeUpdate():对数据库更新;
方法executeQuery():通过SQL语句返回记录集;
代码如下:
//类conn.db.conndb.java
package conn.db; import java.sql.*; public class conndb { Connection conn; ResultSet rs; private int count; public conndb() { try { Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (Exception ex) {} } public ResultSet executeQuery(String sql){ try { conn=DriverManager.getConnection("Jdbc:Odbc:mysql","dxaw","123"); Statement stat=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE); rs=stat.executeQuery(sql); } catch (Exception ex1) { } return rs; } public void executeUpdate(String sql){ try { conn = DriverManager.getConnection("Jdbc:Odbc:mysql", "dxaw","123"); Statement stat=conn.createStatement(); stat.executeQuery(sql); } catch (Exception ex2) { } } } |