它是spring框架中提供的一個對象，是對原始繁瑣的Jdbc API對象的簡單封裝。spring框架為我們提供了很多的操作模板類。例如:操作關(guān)系型數(shù)據(jù)的JdbcTemplate和HibernateTemplate，操作nosql數(shù)據(jù)庫的RedisTemplate，操作消息隊(duì)列的JmsTemplate等等。

JdbcTemplate開發(fā)步驟

①導(dǎo)入spring-jdbc和spring-tx坐標(biāo)
②創(chuàng)建數(shù)據(jù)庫表和實(shí)體
③創(chuàng)建JdbcTemplate對象
④執(zhí)行數(shù)據(jù)庫操作

JdbcTemplate快速入門

①導(dǎo)入spring-jdbc和spring-tx坐標(biāo)

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.0.5.RELEASE</version>
    </dependency>

②創(chuàng)建accout表和Accout實(shí)體

public class Account {
 
    private String name;
    private double money;
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public double getMoney() {
        return money;
    }
 
    public void setMoney(double money) {
        this.money = money;
    }
 
    @Override
    public String toString() {
        return "Account{" +
                "name='" + name + '\'' +
                ", money=" + money +
                '}';
    }
}

③創(chuàng)建JdbcTemplate對象

④執(zhí)行數(shù)據(jù)庫操作

    //測試JdbcTemplate開發(fā)步驟
    public void test1() throws PropertyVetoException {
        //創(chuàng)建數(shù)據(jù)源對象
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass("com.mysql.jdbc.Driver");
        dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/test");
        dataSource.setUser("root");
        dataSource.setPassword("root");
 
        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        //設(shè)置數(shù)據(jù)源對象  知道數(shù)據(jù)庫在哪
        jdbcTemplate.setDataSource(dataSource);
        //執(zhí)行操作
        int row = jdbcTemplate.update("insert into account values(?,?)", "tom", 5000);
        System.out.println(row);
 
    }

Spring產(chǎn)生JdbcTemplate對象

我們可以將JdbcTemplate的創(chuàng)建權(quán)交給Spring，將數(shù)據(jù)源DataSource的創(chuàng)建權(quán)也交給Spring，在Spring容器內(nèi)部將數(shù)據(jù)源DataSource注入到JdbcTemplate模版對象中，配置如下:

    <!--數(shù)據(jù)源對象-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>
    <!--jdbc模板對象-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"/>
    </bean>

從容器中獲得JdbcTemplate進(jìn)行添加操作

    //測試Spring產(chǎn)生jdbcTemplate對象
    public void test2() throws PropertyVetoException {
        ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
        JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);
        jdbcTemplate.update("insert into account values(?,?)", "lisi", 5000);
        System.out.println(row);
    }

JdbcTemplate的常用操作

修改操作、刪除和查詢?nèi)坎僮?/p>

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class JdbcTemplateCRUDTest {
 
    @Autowired
    private JdbcTemplate jdbcTemplate;
 
    @Test
    public void testQueryCount(){
        Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
        System.out.println(count);
    }
 
    @Test
    public void testQueryOne(){
        Account account = jdbcTemplate.queryForObject("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), "tom");
        System.out.println(account);
    }
 
    @Test
    public void testQueryAll(){
        List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        System.out.println(accountList);
    }
 
    @Test
    public void testUpdate(){
        jdbcTemplate.update("update account set money=? where name=?",10000,"tom");
    }
 
    @Test
    public void testDelete(){
        jdbcTemplate.update("delete from account where name=?","tom");
    }
 
}

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