JdbcTemplate

JdbcTemplate主要提供以下五类方法:

1、execute方法：可以用于执行任何SQL语句，一般用于执行DDL语句；

       Execute、executeQuery、executeUpdate

2、update方法及batchUpdate方法：update方法用于执行新增、修改、删除等语句；batchUpdate方法用于执行批处理相关语句 SQL SERVCER(GO SQL语句 GO) ；

3、query方法及queryForXXX方法：用于执行查询相关语句；

4、call方法：用于执行存储过程、函数相关语句。

1JdbcTemplate的第一个案例

　　　　首先导入依赖

<dependency>
  <groupId>org.springframework</groupId>
  <artifactId>spring-jdbc</artifactId>
  <version>4.2.0.RELEASE</version>
</dependency>
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.32</version>
</dependency>

数据库结构

1. 创建数据库library
2. 创建表book
3. 结构如下

 　　4.添加数据

查询的案例

添加entity包，创建Book类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Book {
    private String bookid;
    private String bookName;
    private String bookprice;
}

创建Dao层面添加方法

public interface IBookDao {
    List<Book> findAll();
}

创建DaoMapper重写方法

方法继承JdbcDaoSupport

public class IBookDaoImpl extends JdbcDaoSupport implements IBookDao {
    @Override
    public List<Book> findAll() {
        JdbcTemplate jdbcTemplate = this.getJdbcTemplate();
        String sql = "select * from book";
        /*List<Book> list = jdbcTemplate.query(sql, new RowMapper<Book>() {
            @Override
            *//**
             *
             * @param rs
             * @param rowNum
             * @return
             * @throws SQLException
             *//*

            public Book mapRow(ResultSet rs, int rowNum) throws SQLException {
                Book book = new Book();
                book.setBookid(rs.getString("bookid"));
                book.setBookName(rs.getString("bookName"));
                book.setBookprice(rs.getString("bookprice"));
                return book;
            }
        });*/
        RowMapper<Book> rowMapper = new BeanPropertyRowMapper<>(Book.class);
        List<Book> list = jdbcTemplate.query(sql,rowMapper);
        return list;
    }
}

创建Service

public interface IBookService {
    List<Book> findAll();
}

创建ServiceImpl

public class IBookServiceImpl implements IBookService {
    private IBookDao iBookDao;

    public void setiBookDao(IBookDao iBookDao) {
        this.iBookDao = iBookDao;
    }

    public IBookDao getiBookDao() {
        return iBookDao;
    }

    @Override
    public List<Book> findAll() {

        return iBookDao.findAll();
    }
}

配置applicationContext-day19jdbc.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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd

        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
    <!--1.配置数据源-->
    <!--Spring内置的内置源:创建或者用来提供连接的,不负责管理，使用连接池-->
    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <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>
    <!--2.识别到配置文件-->
    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>
    <!--3.构建jdbcTemplate-->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <property name="dataSource" ref="datasource"></property>
    </bean>

    <!--4.创建Dao-->
    <bean id="bookDao" class="cn.jdbc.dao.IBookDaoImpl">
        <property name="jdbcTemplate" ref="jdbcTemplate"></property>
    </bean>

    <!--5.Service-->
    <bean id="bookService" class="cn.jdbc.service.IBookServiceImpl">
        <property name="iBookDao" ref="bookDao"></property>
    </bean>
</beans>

编写测试类TextJDBC

@Test
 public void tesss(){
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext-day19jdbc.xml");
    IBookService bookService = (IBookService) ctx.getBean("bookService");
    List<Book> all = bookService.findAll();
    for (Book book:all){
        System.out.print(book.getBookid()+"	");
        System.out.print(book.getBookName()+"	");
        System.out.print(book.getBookprice());
        System.out.println();
    }
}

运行效果