Spring JdbcTemplate实现添加与查询方法详解

 <dependencies>
    <!-- 基于Maven依赖传递性，导入spring-context依赖即可导入当前所需所有jar包 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.23</version>
    </dependency>
    <!-- Spring 持久化层支持jar包 -->
    <!-- Spring 在执行持久化层操作、与持久化层技术进行整合过程中，需要使用orm、jdbc、tx三个
    jar包 -->
    <!-- 导入 orm 包就可以通过 Maven 的依赖传递性把其他两个也导入 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>5.3.23</version>
    </dependency>
    <!-- Spring 测试相关 -->
    <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-test</artifactId>
    <version>5.3.23</version>
    </dependency>
        <!-- junit测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <!-- MySQL驱动 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.16</version>
        </dependency>
        <!-- 数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.31</version>
        </dependency>
    </dependencies>

 <!--引入jdbc.properties-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"></property>
        <property name="url" value="${jdbc.url}"></property>
        <property name="username" value="${jdbc.username}"></property>
        <property name="password" value="${jdbc.password}"></property>
    </bean>
    <bean class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

//指定当前测试类在Spring的测试环境中执行，此时就可以通过注入的方式直接获取IOC容器中的bean
@RunWith(SpringJUnit4ClassRunner.class)
//设置Spring测试环境的配置文件
@ContextConfiguration("classpath:spring-jdbc.xml")
public class JdbcTemplateTest {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    @Test
    public void testInsert() {
        String sql = "insert into t_user values(null,?,?,?,?,?)";
        jdbcTemplate.update(sql,"root","123",23,"女","123@qq.com");
    }
}

    @Test
    public void testGetUserById() {
        String sql = "select * from t_user where id = ?";
        User user = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<>(User.class), 1);
        System.out.println(user);
    }

    @Test
    public void testGetAllUser() {
        String sql = "select * from t_user";
        List<User> list = jdbcTemplate.query(sql, new BeanPropertyRowMapper<>(User.class));
        list.forEach(System.out::println);
    }

@Test
public void testGetCount() {
    String sql = "select count(*) from t_user";
    Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
    System.out.println(count);
}