Java框架_Spring5_day08_JdbcTemplate的简单使用

最新推荐文章于 2023-10-05 14:15:39 发布

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十、Spring 中的 JdbcTemplate

10.1 概述

JdbcTemplate 是spring框架中提供的一个对象，是对原始Jdbc API对象的简单封装。

10.2 准备工作

导入 jar 包

    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.2.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>
    </dependencies>

Account.java

public class Account {
    private Integer id;
    private String name;
    private Float money;
}

JdbcTemplateDemo.java

    public static void main(String[] args) {
        DriverManagerDataSource ds = new DriverManagerDataSource();
        ds.setDriverClassName("com.mysql.jdbc.Driver");
        ds.setUrl("jdbc:mysql:///account");
        ds.setUsername("root");
        ds.setPassword("1234");

        JdbcTemplate jdbcTemplate = new JdbcTemplate();
        jdbcTemplate.setDataSource(ds);
        jdbcTemplate.execute("insert into account (name,money) values ('ccc',500)");
    }

10.3 使用 Spring 容器创建数据源和 JdbcTemplate

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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd">

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

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql:///spring"></property>
        <property name="username" value="root"></property>
        <property name="password" value="1234"></property>
    </bean>
</beans>

JdbcTemplate.java

public class JdbcTemplateDemo1 {
    public static void main(String[] args) {   
        ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
        JdbcTemplate jt = ac.getBean("jdbcTemplate", JdbcTemplate.class);

        List<Account> list = jt.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
        for (Account account : list) {
            System.out.println(account);
        }

        //List<Account> list = jt.query("select * from account", new MyRowMapper());
        //for (Account account : list) {
        //    System.out.println(account);
        //}
    }
}

// 解决实体的属性和数据库的字段名称不一致的情况
class MyRowMapper implements RowMapper<Account>{

    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getFloat("money"));
        return account;
    }
}