Java开发网 - 连接数据库用的JavaBean

Topic: 连接数据库用的JavaBean

1.连接数据库用的JavaBean

Posted by: icecloud
Posted on: 2003-01-03 03:47

package works;
//我的包

import java.sql.*;

public class JdbcBean {
private String sDBDriver="sun.jdbc.odbc.JdbcOdbcDriver";
private String connStr="jdbc:odbc:Mydata";
private Connection conn=null;
private Statement stmt=null;
private String username="";
private String password="";
private ResultSet rs=null;

public JdbcBean() throws SQLException {
try {
//注册数据库驱动程序为Oracle驱动

Class.forName(sDBDriver);
conn = DriverManager.getConnection(connStr,username,password);
}
catch(java.lang.ClassNotFoundException e) {
System.err.println("jdbcBean(): " + e.getMessage());
}
}

//executeQuery方法用于进行记录的查询操作

//入口参数为sql语句，返回ResultSet对象
public ResultSet executeQuery(String sql)
{
try {
//建立数据库连接

stmt = conn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
//执行数据库查询操作
rs = stmt.executeQuery(sql);
}
catch (SQLException ex) {
System.err.println("db.executeQuery: " + sql + "" + ex.getMessage());
}
finally{
return rs;
}
}

//executeUpdate方法用于进行add或者update记录的操作

//入口参数为sql语句，成功返回true，否则为false
public boolean executeUpdate(String sql) {
boolean bupdate = false;
rs = null;
try {
//建立数据库连接，其它参数说明同上面的一样
stmt = conn.createStatement();
int rowCount = stmt.executeUpdate(sql);
//如果不成功，bupdate就会返回0
if (rowCount != 0)
bupdate = true;
}
catch (SQLException ex) {
//打印出错信息
System.err.println("db.executeUpdate: " + ex.getMessage());
}
finally {
return bupdate;
}
}

protected void finalize(){

}

}

2.Re:连接数据库用的JavaBean [Re: icecloud]	Copy to clipboard
Posted by: 00000000 Posted on: 2003-01-13 15:33 surport

3.Re:连接数据库用的JavaBean [Re: icecloud]	Copy to clipboard
Posted by: floater Posted on: 2003-01-13 22:46 In public boolean executeUpdate(String sql) returning the rowCount is better since it's a very useful info for the users of this bean.

4.Re:连接数据库用的JavaBean [Re: icecloud]	Copy to clipboard
Posted by: flytiger Posted on: 2003-02-13 01:27 Why don't close the statement, resultset and connection?