Spring框架学习10——JDBC Template 实现数据库操作
2024-08-26 15:09:39
为了简化持久化操作,Spring在JDBC API之上提供了JDBC Template组件。
1、添加依赖
添加Spring核心依赖,MySQL驱动
<!--Spring核心基础依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- AOP联盟依赖 -->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.2.RELEASE</version>
</dependency>
<!-- Mysql驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.38</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>
2、配置数据源
在applicationContext.xml文件中配置数据源
<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"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
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.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd"> <!--配置数据源-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<!--MySQL数据库驱动-->
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<!--连接数据库的URL-->
<property name="url" value="jdbc:mysql://localhost:3306/library?useUnicode=true&characterEncoding=utf8"></property>
<!--连接数据库的用户名-->
<property name="username" value="root"></property>
<!--连接数据库的密码-->
<property name="password" value="root"></property>
</bean>
<!--配置JDBC模板-->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean> </beans>
3、update方法
使用update方法对数据进行增删改操作
获取JdbcTemplate对象
private JdbcTemplate jdbcTemplate; {
ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");
jdbcTemplate = (JdbcTemplate) app.getBean("jdbcTemplate");
}
添加数据
String sql = "insert into book(name,author,price) values(?,?,?)";
jdbcTemplate.update(sql,new Object[]{"西游记","吴承恩",90.8});
修改数据
String sql = "update book set name=?,author=?,price=? where id=?";
jdbcTemplate.update(sql,"红楼梦","曹雪芹",100,1);
删除数据
String sql = "delete from book where id=?";
jdbcTemplate.update(sql,1);
批量操作数据,批量执行多SQL语句
String[] sqls = {
"insert into book(name,author,price) values('Java基础','张三',90)",
"insert into book(name,author,price) values('C语言','李四',80)",
"insert into book(name,author,price) values('Web前端','王五',95)",
"update book set name='水浒传',author='施耐庵' where id=1",
};
jdbcTemplate.batchUpdate(sqls);
批量操作数据,执行同SQL语句
String sql = "insert into book(name,author,price) values(?,?,?)";
List<Object[]> list = new ArrayList<Object[]>();
list.add(new Object[]{"HTML","Tom",90.8});
list.add(new Object[]{"CSS","Jack",88});
list.add(new Object[]{"JavaScript","Lily",89});
jdbcTemplate.batchUpdate(sql,list);
4、查询简单类型
查询单个数据
String sql = "select count(*) from book";
int count = jdbcTemplate.queryForObject(sql,Integer.class);
System.out.println(count);
查询多个数据
String sql = "select name from book where price=?";
List<String> list = jdbcTemplate.queryForList(sql,String.class,90);
System.out.println(list);
5、查询复杂类型(封装为Map)
查询单个对象
String sql = "select * from book where id=?";
Map<String,Object> map = jdbcTemplate.queryForMap(sql,2);
System.out.println(map);
查询多个对象
String sql = "select * from book";
List<Map<String,Object>> list =jdbcTemplate.queryForList(sql);
System.out.println(list);
6、查询复杂类型(封装为实体对象)
创建实体类
public class Book {
private int id;
private String name;
private String author;
private double price;
//getter、setter、toString方法
}
查询单个对象
String sql = "select * from book where id=?";
Book book = jdbcTemplate.queryForObject(sql,new BeanPropertyRowMapper<Book>(Book.class),2);
System.out.println(book);
查询多个对象
String sql = "select * from book";
List<Book> list = jdbcTemplate.query(sql,new BeanPropertyRowMapper<Book>(Book.class));
System.out.println(list);
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