JDBC Template的基本使用

1.使用maven引用依赖

<dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>

    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-context -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-core -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-beans -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-tx -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.19</version>
    </dependency>

  </dependencies>

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


    <!--配置dataSource-->
    <bean  id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/demo1?serverTimezone=UTC"></property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
    </bean>
    
<!--使用jdbcTemplate工具类-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
</beans>

3.ddl操作（建表之类）

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.jdbc.core.JdbcTemplate;


public class test {
@Test
    public void test(){
        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("myApplication.xml");
        JdbcTemplate springTemplate = (JdbcTemplate) applicationContext.getBean("jdbcTemplate");
        springTemplate.execute("create table test(id int,username varchar(10))");
    }
}

4.增删改：

 对应的使用例子

public void testUpdate(){
        String sql = "insert into student(name,sex) values(?,?)";
        jdbcTemplate.update(sql,new Object[]{"张飞","男"});
    }

    public void testUpdate2(){
        String sql = "update student set sex=? where id=?";
        jdbcTemplate.update(sql,"女",1003);
    }

    public void testBatchUpdate(){
        String[] sqls={
                "insert into student(name,sex) values('关羽','女')",
                "insert into student(name,sex) values('刘备','男')",
                "update student set sex='女' where id=2001"
        };
        jdbcTemplate.batchUpdate(sqls);
    }

    public void testBatchUpdate2(){
        String sql = "insert into selection(student,course) values(?,?)";
        List<Object[]> list = new ArrayList<Object[]>();
        list.add(new Object[]{1005,1001});
        list.add(new Object[]{1005,1003});
        jdbcTemplate.batchUpdate(sql,list);
    }

5.查询

public void testQuerySimple1(){
        String sql = "select count(*) from student";
        int count = jdbcTemplate.queryForObject(sql,Integer.class);
        System.out.println(count);
    }

    public void testQuerySimple2(){
        String sql = "select name from student where sex=?";
        List<String> names = jdbcTemplate.queryForList(sql,String.class,"女");
        System.out.println(names);
    }

    public void testQueryMap1(){
        String sql = "select * from student where id = ?";
        Map<String,Object> stu = jdbcTemplate.queryForMap(sql,1003);
        System.out.println(stu);
    }

    public void testQueryMap2(){
        String sql = "select * from student";
        List<Map<String,Object>> stus = jdbcTemplate.queryForList(sql);
        System.out.println(stus);
    }

    public void testQueryEntity1(){
        String sql = "select * from student where id = ?";
        Student stu = jdbcTemplate.queryForObject(sql, new StudentRowMapper(), 1004);
        System.out.println(stu);
    }
    @org.junit.Test
    public void testQueryEntity2(){
        String sql = "select * from student";
        List<Student> stus = jdbcTemplate.query(sql,new StudentRowMapper());
        System.out.println(stus);
    }

    private class StudentRowMapper implements RowMapper<Student>{
        public Student mapRow(ResultSet resultSet, int i) throws SQLException {
            Student stu = new Student();
            stu.setId(resultSet.getInt("id"));
            stu.setName(resultSet.getString("name"));
            stu.setSex(resultSet.getString("sex"));
            stu.setBorn(resultSet.getDate("born"));
            return stu;
        }
    }