DbUtils的使用

Commons DbUtils是Apache组织提供的一个对JDBC进行简单封装的开源工具类库，使用它能够简化JDBC应用程序的开发，同时也不会影响程序的性能

导入jar包

1. c3p0-0.9.1.2-jdk1.3.jar
2. c3p0-0.9.1.2.jar
3. c3p0-oracle-thin-extras-0.9.1.2.jar
4. commons-dbutils-1.4.jar
5. mysql-connector-java-5.1.7-bin.jar

增删改

public class TestDbUtils {

	@Test
	public void test() throws SQLException {
		ComboPooledDataSource ds = new ComboPooledDataSource();
		QueryRunner runner = new QueryRunner(ds);
		
		//增加
		/*String sql = "insert into person values(null,?,?,?,null)";
		runner.update(sql,"qf",21,new Date(0));*/
		
		//删除
		/*String sql = "delete from person where id>?";
		runner.update(sql,18);*/
				
		//修改
		String sql = "update person set name=? where id=?";
		runner.update(sql,"smile",18);
	}
}

查询　

查询一个

public class TestDbUtils {

    @Test
    /*
     * 匿名内部类实现
     */
    public void test() throws SQLException {
        ComboPooledDataSource ds = new ComboPooledDataSource();
        QueryRunner runner = new QueryRunner(ds);
        
        Person person = runner.query("select * from person where id=?", new ResultSetHandler<Person>() {

            @Override
            public Person handle(ResultSet rs) throws SQLException {
                Person p = null;
                while(rs.next()) {
                    String name = rs.getString("name");
                    int age = rs.getInt("age");
                    Date time = rs.getDate("time");
                    String address = rs.getString("address");
                    p = new Person(name, age, time, address);
                }
                return p;
            }
        }, 2);
        System.out.println(person);
    }
    
    @Test
    /*
     * 使用ResultSetHandler接口的实现类
     */
    public void test2() throws SQLException {
        ComboPooledDataSource ds = new ComboPooledDataSource();
        QueryRunner runner = new QueryRunner(ds);
        
        Person person = runner.query("select * from person where id=?", new BeanHandler<Person>(Person.class), 2);
        System.out.println(person);
    }
}

查询多个

public class TestDbUtils {

    /*
     * 使用ResultSetHandler接口的实现类
     */
    @Test
    public void test2() throws SQLException {
        ComboPooledDataSource ds = new ComboPooledDataSource();
        QueryRunner runner = new QueryRunner(ds);
        
        List<Person> list = runner.query("select * from person ", new BeanListHandler<Person>(Person.class));
        for (Person person : list) {
            System.out.println(person);
        }
    }
}

输出

Person [name=smile, age=12, time=2018-03-06 19:32:35.0, address=null]
Person [name=wxf, age=13, time=2018-03-07 19:33:37.0, address=null]
Person [name=smile, age=24, time=1970-01-01 00:00:00.0, address=null]