spring-jdbc

引入相關jar

spring-core包；

spring-jdbc包

Dept.java

package cn.itcast.h_jdbc;

public class Dept {

	private int deptId;
	private String deptName;
	public int getDeptId() {
		return deptId;
	}
	public void setDeptId(int deptId) {
		this.deptId = deptId;
	}
	public String getDeptName() {
		return deptName;
	}
	public void setDeptName(String deptName) {
		this.deptName = deptName;
	}
	@Override
	public String toString() {
		return "Dept [deptId=" + deptId + ", deptName=" + deptName + "]";
	}
}

UserDao.java

package cn.itcast.h_jdbc;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowCallbackHandler;
import org.springframework.jdbc.core.RowMapper;

public class UserDao {
	
	// IOC容器注入
//	private DataSource dataSource;
//	public void setDataSource(DataSource dataSource) {
//		this.dataSource = dataSource;
//	}
	
	private JdbcTemplate jdbcTemplate;
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}

	
	public void save() {
		String sql = "insert into t_dept(deptName) values('test11');";
		jdbcTemplate.update(sql);
	}
	
	public Dept findById(int id) {
		String sql = "select * from t_dept where deptId=?";
		List<Dept> list = jdbcTemplate.query(sql,new MyResult(), id);
		return (list!=null && list.size()>0) ? list.get(0) : null;
	}
	
	public List<Dept> getAll() {
		String sql = "select * from t_dept";
		List<Dept> list = jdbcTemplate.query(sql, new MyResult());
		return list;
	}
	
	class MyResult implements RowMapper<Dept>{

		// 如何封裝一行記錄
		@Override
		public Dept mapRow(ResultSet rs, int index) throws SQLException {
			Dept dept = new Dept();
			dept.setDeptId(rs.getInt("deptId"));
			dept.setDeptName(rs.getString("deptName"));
			return dept;
		}
		
	}
}

App.java

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App {

	// 容器對象
	ApplicationContext ac = new ClassPathXmlApplicationContext("cn/itcast/h_jdbc/bean.xml");
	
	@Test
	public void testSave() throws Exception {
		UserDao ud = (UserDao) ac.getBean("userDao");
		ud.save();
	}
	@Test
	public void testFindById() throws Exception {
		UserDao ud = (UserDao) ac.getBean("userDao");
		System.out.println(ud.findById(9));
	}
	@Test
	public void testFindAll() throws Exception {
		UserDao ud = (UserDao) ac.getBean("userDao");
		System.out.println(ud.getAll());
	}

}

bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
	
	<!-- 1. 數據源對象: C3P0連接池 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
		<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/spring"></property>
		<property name="user" value="root"></property>
		<property name="password" value="root"></property>
		<property name="initialPoolSize" value="3"></property>
		<property name="maxPoolSize" value="10"></property>
		<property name="maxStatements" value="100"></property>
		<property name="acquireIncrement" value="2"></property>
	</bean>
	
	<!-- 2. 創建JdbcTemplate對象 -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	
	<!-- dao 實例 -->
	<bean id="userDao" class="cn.itcast.h_jdbc.UserDao">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>
</beans>