黑马day12 DbUtils的介绍

DbUtils为不喜欢hibernate框架的钟爱，它是线程安全的，不存在并发问题。

使用步骤：

1. QueryRunner runner=new QueryRunner(这里写数据源...如c3p0的数据元new ComboPooledDataSource()或者dbcp的数据元);

2.使用runner的方法如果要增删改就使用update(String sql,Object ... params) 

sql:传递的sql语句

params：可变参数，为sql语句中的?所代替的参数

 使用runner的方法要查询使用runner的query(String sql,ResultSetHandle handle ,Object ... params)

sql:传递的sql语句

handle :一个接口要是实现其中的handle方法

params:可变参数，为sql语句中的?所代替的参数

案例：

package com.itheima.dbutils;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.junit.Test;
import com.itheima.domain.Account;
import com.mchange.v2.c3p0.ComboPooledDataSource;
public class DbUtilsDemo1 {
@Test
public void add() throws SQLException{
QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
runner.update("insert into account values(null,?,?)", "韩玮",7000);
}
@Test
public void update() throws SQLException{
QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
runner.update("update account set money=? where name=?", 9000,"李卫康");
}
@Test
public void delete() throws SQLException{
QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
runner.update("delete from account where name=?","韩玮");
}
@Test
public void query() throws SQLException{
final Account account=new Account();
QueryRunner runner=new QueryRunner(new ComboPooledDataSource());
runner.query("select * from account where name =?", new ResultSetHandler<Account>(){
@Override
public Account handle(ResultSet rs) throws SQLException {
while(rs.next()){
account.setId(rs.getInt("id"));
account.setName(rs.getString("name"));
account.setMoney(rs.getDouble("money"));
}
return account;
}
}, "李卫康");
System.out.println(account.getMoney());
}
}

mysql> select * from account;
+----+--------+-------+
| id | name   | money |
+----+--------+-------+
|  1 | 李卫康 |  9000 |
+----+--------+-------+
1 row in set


mysql> select * from account;
+----+--------+-------+
| id | name   | money |
+----+--------+-------+
|  1 | 李卫康 | 10000 |
+----+--------+-------+
1 row in set


mysql> select * from account;
+----+--------+-------+
| id | name   | money |
+----+--------+-------+
|  1 | 李卫康 | 10000 |
|  5 | 程崇树 |  5000 |
+----+--------+-------+

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黑马day12 DbUtils的介绍

标签：dbutils