[Spring]Spring AOP学习笔记（3）---Spring JDBC总结

最近学习了下Spring JDBC的一些基本用法，故做此总结。

不知道该如何写这篇总结，稍微汇总下本次学习的源代码，未来可能会用上。

Spring JDBC的配置是在XML文件中进行的，配置一定需要连接成功。查询，更新数据都很常规，下面也提供了这些。

另外，NamedParameterJdbcTemplate具名参数是个非常好用的类，当表的列过多的时候，具名参数是个不错的选择。

db.properties配置文件

username=root
password=root
driverClass=com.mysql.jdbc.Driver
JdbcUrl=jdbc:mysql://127.0.0.1:3307/hello

initPoolSize=5
maxPoolSize=10

spring-adbc.xml文件

<?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:context="http://www.springframework.org/schema/context"
	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-4.0.xsd">

	<!-- 自动扫描包 -->
	<context:component-scan base-package="com.spring.jdbc.test1"></context:component-scan>

	<!-- 导入资源文件 -->
	<context:property-placeholder location="classpath:db.properties" />

	<!-- 配置c3p0数据源 -->
	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		<property name="user" value="${username}"></property>
		<property name="password" value="${password}"></property>
		<property name="jdbcUrl" value="${JdbcUrl}"></property>
		<property name="driverClass" value="${driverClass}"></property>
		<property name="numHelperThreads" value="10"></property>
		<property name="initialPoolSize" value="${initPoolSize}"></property>
		<property name="maxPoolSize" value="${maxPoolSize}"></property>
	</bean>

	<!-- 配置JDBCTemplate -->
	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<property name="dataSource" ref="dataSource"></property>
	</bean>

	<!-- 配置NamedParameterJdbcTemplate -->
	<bean id="namedParameterJdbcTemplate"
		class="org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate">
		<constructor-arg ref="dataSource"></constructor-arg>
	</bean>
</beans>

package com.spring.jdbc.test1;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;

@Repository
public class StudentDao {

	@Autowired
	private JdbcTemplate jdbcTemplate;

	public Student get(Integer ID) {
		String sql = "select * from Student where id = ?";
		Student student = null;
		RowMapper<Student> rowMapper = new BeanPropertyRowMapper<Student>(
				Student.class);
		student = jdbcTemplate.queryForObject(sql, rowMapper, ID);
		return student;
	}
}

package com.spring.jdbc.test1;

public class Student {
	private Integer id;
	private String name;
	private String sex;
	private Integer grade;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public Integer getGrade() {
		return grade;
	}

	public void setGrade(Integer grade) {
		this.grade = grade;
	}

	@Override
	public String toString() {
		return "Student [id=" + id + ", name=" + name + ", sex=" + sex
				+ ", grade=" + grade + "]";
	}
	
}

package com.spring.jdbc.test1;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.sql.DataSource;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.jdbc.core.namedparam.BeanPropertySqlParameterSource;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.core.namedparam.SqlParameterSource;

public class JDBCTest {
	private ApplicationContext ctx = null;
	private JdbcTemplate jdbcTemplate = null;
	private StudentDao studentDao = null;
	private NamedParameterJdbcTemplate namedParameterJdbcTemplate = null;

	{
		ctx = new ClassPathXmlApplicationContext("spring-jdbc.xml");
		jdbcTemplate = ctx.getBean(JdbcTemplate.class);
		studentDao = ctx.getBean(StudentDao.class);
		namedParameterJdbcTemplate = ctx.getBean(NamedParameterJdbcTemplate.class);
	}

	/**
	 * 测试数据库是否连接上
	 * 
	 * @throws SQLException
	 */
	@Test
	public void testDataSource() throws SQLException {
		System.out.println("hehe");
		DataSource datasource = (DataSource) ctx.getBean("dataSource");
		System.out.println(datasource.getConnection());
	}

	/**
	 * 执行批量更新，插入数据
	 */
	@Test
	public void testBatchUpdate() {
		String sql = "insert into Student value(?,?,?,?)";
		List<Object[]> list = new ArrayList<>();
		list.add(new Object[] { 3, "Ny", "F", "11" });
		list.add(new Object[] { 4, "N", "F", "20" });
		list.add(new Object[] { 5, "Nay", "F", "12" });
		list.add(new Object[] { 6, "Nqaancy", "F", "130" });
		list.add(new Object[] { 7, "Nncq1y", "F", "110" });
		list.add(new Object[] { 8, "Nancysw", "F", "10" });

		jdbcTemplate.batchUpdate(sql, list);
	}

	/**
	 * 修改数据
	 * 
	 * @throws SQLException
	 */
	@Test
	public void testJDBCUpdate() throws SQLException {
		String sql = "UPDATE Student set grade=? where id=?";
		System.out.println("111");
		System.out.println(jdbcTemplate.update(sql, 10, 2));
	}

	/**
	 * 查询数据，并且赋值给对象,通过结果输出结果,jdbcTemplate.queryForObject(sql1, rowMapper)
	 * 的返回值仅仅是一个对象
	 */
	@Test
	public void testQueryForObject() {
		String sql1 = "select * from Student where id = 2";
		String sql2 = "select * from Student where id = ?";

		RowMapper<Student> rowMapper = new BeanPropertyRowMapper<>(
				Student.class);
		Student student1 = jdbcTemplate.queryForObject(sql1, rowMapper);
		Student student2 = jdbcTemplate.queryForObject(sql2, rowMapper, 1);
		System.out.println(student1);
		System.out.println(student2);
	}

	/**
	 * 查询到的结果是一个集合
	 */
	@Test
	public void testQueryList() {
		String sql = "select * from Student";
		RowMapper<Student> rowMapper = new BeanPropertyRowMapper<Student>(
				Student.class);
		List<Student> listOfStudent = jdbcTemplate.query(sql, rowMapper);
		System.out.println(listOfStudent);

	}

	/**
	 * 统计查询，获取单列值
	 */
	@Test
	public void testQueryNumber() {
		String sql = "select count(id) from Student";
		Integer num = jdbcTemplate.queryForObject(sql, Integer.class);
		System.out.println(num);
	}

	/**
	 * 测试StudentDao 测试通过
	 */
	@Test
	public void testStudentDao() {
		Student student = studentDao.get(2);
		System.out.println(student);
	}

	/**
	 * 测试NamedParameterJdbcTemplate
	 * 好处：便于维护，可以给变量起名字
	 * 缺点：较为麻烦
	 */
	@Test
	public void testNamedParameterJdbcTemplate(){
		String sql="insert into Student value(:id,:name,:sex,:grade)";
		Map<String, Object> paramMap = new HashMap<String, Object>();
		
		paramMap.put("id", 100);
		paramMap.put("name", "Hello");
		paramMap.put("sex", "M");
		paramMap.put("grade", 1000);
		
		namedParameterJdbcTemplate.update(sql, paramMap);
	}
	
	/**
	 * 测试namedParameterJdbcTemplate的另一种使用方式
	 */
	@Test
	public void testNamedParameterJdbcTemplate2(){
		String sql="insert into Student value(:id,:name,:sex,:grade)";
		Student student = new Student();
		student.setGrade(1000);
		student.setId(34);
		student.setName("HEHEHEH");
		student.setSex("W");
		SqlParameterSource paramSource = new BeanPropertySqlParameterSource(student);
		namedParameterJdbcTemplate.update(sql, paramSource);
	}
	
}