（7）Spring对JDBC的支持

使用Spring JDBC的步骤

1、引入jar包
spring-jdbc-3.2.5.RELEASE.jar
spring-tx-3.2.5.RELEASE.jar
c3p0-0.9.1.2.jar
mysql-connector-java-5.1.38-bin.jar
2、配置
c3p0数据库连接池的配置

JdbcTemplate对象
Dao对象

3、测试

applicationContext.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://127.0.0.1:3306/test"></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">
<constructor-arg index="0" type="javax.sql.DataSource" ref="dataSource"></constructor-arg>
</bean>

<!-- dao 实例 -->
<bean id="deptDao" class="com.rk.hibernate.i_jdbc.DepartmentDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>
</bean>

</beans>

Department.java

package com.rk.hibernate.i_jdbc;

public class Department
{
private int deptId;
private String deptName;
private int version;

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;
}
public int getVersion()
{
return version;
}
public void setVersion(int version)
{
this.version = version;
}
@Override
public String toString()
{
return "Department [deptId=" + deptId + ", deptName=" + deptName + ", version=" + version + "]";
}

}

DepartmentDao.java

package com.rk.hibernate.i_jdbc;

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

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

public class DepartmentDao
{
private JdbcTemplate jdbcTemplate;

public void setJdbcTemplate(JdbcTemplate jdbcTemplate)
{
this.jdbcTemplate = jdbcTemplate;
}

public void save()
{
String sql = "INSERT INTO T_Department(name,dept_version) values(?,?)";
jdbcTemplate.update(sql, "Tom",0);
}

public Department findById(int id)
{
String sql = "SELECT * FROM T_Department where id=?";
List<Department> list = jdbcTemplate.query(sql,new MyResult(),id);
return (list != null && list.size()>0) ? list.get(0) : null;
}

public List<Department> findAll()
{
String sql = "SELECT * FROM T_Department";
List<Department> list = jdbcTemplate.query(sql, new MyResult());
return list;
}
}

class MyResult implements RowMapper<Department>
{
@Override
public Department mapRow(ResultSet rs, int rowNum) throws SQLException
{
int id = rs.getInt("id");
String name = rs.getString("name");
int dept_version = rs.getInt("dept_version");

Department dept = new Department();
dept.setDeptId(id);
dept.setDeptName(name);
dept.setVersion(dept_version);
return dept;
}
}

App.java

package com.rk.hibernate.i_jdbc;

import java.util.List;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class App
{
private ApplicationContext ac = new ClassPathXmlApplicationContext("/com/rk/hibernate/i_jdbc/applicationContext.xml");

@Test
public void test()
{
DepartmentDao deptDao = (DepartmentDao) ac.getBean("deptDao");
//1. 保存
//		deptDao.save();
//2.根据id进行查询
//		Department dept = deptDao.findById(9);
//		System.out.println(dept);
//3.查询所有
List<Department> list = deptDao.findAll();
System.out.println(list.size());
System.out.println(list);
}
}