spring 对jdbc支持与配置

1、引入jar文件

spring-jdbc-3.2.5.RELEASE.jar

spring-tx-3.2.5.RELEASE.jar

2、创建Dao

public class UserDao {
	
	//注入IOC容器（set方法）
	private JdbcTemplate jdbcTemplate;
	public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
		this.jdbcTemplate = jdbcTemplate;
	}

	//保存
	public void save() {
		String sql = "insert into t_dept(deptName) values('test');";
		jdbcTemplate.update(sql);
	}
	
	//通过ID查询数据库数据
	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;
	}
	
	//查询全部数据
	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>{

		// 封装一行Map
		@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;
		}
		
	}
}

3、创建实体对象

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;
	}
	
}

4、配置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. 数据源对象: C3P0连接池 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql:///hib_demo"></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. 创建JdbcTemplate对象 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!-- dao 实例 -->
    <bean id="userDao" class="cn.itcast.h_jdbc.UserDao">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>
</beans>     

5、测试

public class App {


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

附：如果不用spring进行配置，那么Dao中的方法应该：

public class UserDao01 {
	public void save() {
		try {
			String sql = "insert into t_dept(deptName) values('test');";
			Connection con = null;
			Statement stmt = null;
			Class.forName("com.mysql.jdbc.Driver");
			// Á¬½Ó¶ÔÏó
			con = DriverManager.getConnection("jdbc:mysql:///hib_demo", "root", "root");
			// Ö´ÐÐÃüÁî¶ÔÏó
			stmt =  con.createStatement();
			// Ö´ÐÐ
			stmt.execute(sql);
			
			// ¹Ø±Õ
			stmt.close();
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

或者拿出Datasource注入UserDao中：

public class UserDao02 {
	
	// 注入IOC容器
	private DataSource dataSource;
	public void setDataSource(DataSource dataSource) {
		this.dataSource = dataSource;
	}

	
	public void save() {
		try {
			String sql = "insert into t_dept(deptName) values('test');";
			Connection con = null;
			Statement stmt = null;
			
			con = dataSource.getConnection();
			
			stmt =  con.createStatement();
			
			stmt.execute(sql);
			
			// ¹Ø±Õ
			stmt.close();
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

在xml中需要配置UserDao实例，注入datasource对象，上面的JdbcTemplate对象删掉

<!-- dao 实例 -->
	<bean id="userDao" class="cn.itcast.h_jdbc.UserDao">
		<property name="jdbcTemplate" ref="jdbcTemplate"></property>
	</bean>