Spring之JdbcTemplate(带你一篇文章搞定JdbcTemplate)
【摘要】 文章目录前言一、相关依赖(AOP、IOC、JdbcTemplate都有)二、代码实战1.方法讲解2.代码实例总结前言Spring对JDBC进行封装,使用JdbcTemplate对数据库进行操作更加方便。一、相关依赖(AOP、IOC、JdbcTemplate都有) <?xml version="1.0" encoding="UTF-8"?><project xmlns="http...
前言
Spring对JDBC进行封装,使用JdbcTemplate对数据库进行操作更加方便。
一、相关依赖(AOP、IOC、JdbcTemplate都有)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>spring</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>19</maven.compiler.source>
<maven.compiler.target>19</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.9.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.16</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.19</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>net.sourceforge.cglib</groupId>
<artifactId>com.springsource.net.sf.cglib</artifactId>
<version>2.1.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>6.0.9</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.19</version>
</dependency>
</dependencies>
</project>
二、代码实战
1.方法讲解
- 增删改:
int update(String sql, Object... args);
- 查询(返回某个值):
T queryForObject(String sql,Class<T> requiredType);
- 查询(返回某个对象):
T queryForObject(String sql,Class<T> requiredType);
- 查询(返回集合):
List<T> query(String sql,RowMapper<T> rowMapper,Object... args);
- 批量增删改:
int[] batchUpdate(String sql,List<Object[]> batchArgs);
2.代码实例
实体层——Book实体类:
package com.dragon.jdbc.entity;
public class Book {
private String bookId;
private String bookname;
private String bstatus;
public String getBookId() {
return bookId;
}
public String getBookname() {
return bookname;
}
public String getBstatus() {
return bstatus;
}
public void setBookId(String bookId) {
this.bookId = bookId;
}
public void setBookname(String bookname) {
this.bookname = bookname;
}
public void setBstatus(String bstatus) {
this.bstatus = bstatus;
}
@Override
public String toString() {
return "Book{" +
"bookId='" + bookId + '\'' +
", bookname='" + bookname + '\'' +
", bstatus='" + bstatus + '\'' +
'}';
}
}
Dao层——BookDao类:
package com.dragon.jdbc.dao;
import com.dragon.jdbc.entity.Book;
import java.util.List;
public interface BookDao {
public void add(Book book);//添加
public void update(Book book);//修改更新
public void delete(String id);//删除
public int selectCount();//查找数量,返回int类型
public Book findBookInfo(String id);//根据id查找某本书,返回对象
public List<Book> findAllBook();//查找数据库内所有对象,返回集合
public void bathAddBook(List<Object[]> bathArgs);//批量添加
public void bathUpdateBook(List<Object[]> bathArgs);//批量修改
public void bathDeleteBook(List<Object[]> bathArgs);//批量删除
}
BookDao实现类BookDaoImpl:
package com.dragon.jdbc.dao;
import com.dragon.jdbc.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
import java.util.Arrays;
import java.util.List;
@Repository
public class BookDaoImpl implements BookDao{
@Autowired
private JdbcTemplate jdbcTemplate;
@Override
public void add(Book book) {
String sql="insert into t_book values(?,?,?)";
Object[] args={book.getBookId(),book.getBookname(),book.getBstatus()};
int update=jdbcTemplate.update(sql,args);
System.out.println(update);
}
@Override
public void update(Book book) {
String sql="update t_book set bookname=?,bstatus=? where book_id=?";
Object[] args={book.getBookname(),book.getBstatus(),book.getBookId()};
int update=jdbcTemplate.update(sql,args);
System.out.println(update);
}
@Override
public void delete(String id) {
String sql="delete from t_book where book_id=?";
int update=jdbcTemplate.update(sql,id);
System.out.println(update);
}
@Override
public int selectCount() {
String sql="select count(*) from t_book";
Integer count=jdbcTemplate.queryForObject(sql,Integer.class);
return count;
}
@Override
public Book findBookInfo(String id) {
String sql="select * from t_book where book_id=?";
Book book= jdbcTemplate.queryForObject(sql,new BeanPropertyRowMapper<Book>(Book.class),id);
return book;
}
@Override
public List<Book> findAllBook() {
String sql="select * from t_book";
List<Book> bookList=jdbcTemplate.query(sql,new BeanPropertyRowMapper<Book>(Book.class));
return bookList;
}
@Override
public void bathAddBook(List<Object[]> bathArgs) {
String sql="insert into t_book values(?,?,?)";
int[] ints=jdbcTemplate.batchUpdate(sql,bathArgs);
System.out.println(Arrays.toString(ints));
}
@Override
public void bathUpdateBook(List<Object[]> bathArgs) {
String sql="update t_book set bookname=?,bstatus=? where book_id=?";
int[] ints=jdbcTemplate.batchUpdate(sql,bathArgs);
System.out.println(Arrays.toString(ints));
}
@Override
public void bathDeleteBook(List<Object[]> bathArgs) {
String sql="delete from t_book where book_id=?";
int[] ints=jdbcTemplate.batchUpdate(sql,bathArgs);
System.out.println(Arrays.toString(ints));
}
}
service层——BookService:
package com.dragon.jdbc.service;
import com.dragon.jdbc.dao.BookDao;
import com.dragon.jdbc.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class BookService {
@Autowired
private BookDao bookDao;
public void addBook(Book book){
bookDao.add(book);
}
public void updateBook(Book book){
bookDao.update(book);
}
public void deleteBook(String id){
bookDao.delete(id);
}
public int findCount(){
return bookDao.selectCount();
}
public Book finOne(String id){
return bookDao.findBookInfo(id);
}
public List<Book> findAll(){
return bookDao.findAllBook();
}
public void bathAdd(List<Object[]> bathArgs){
bookDao.bathAddBook(bathArgs);
}
public void bathUpdate(List<Object[]> bathArgs){
bookDao.bathUpdateBook(bathArgs);
}
public void bathDelete(List<Object[]> bathArgs){
bookDao.bathDeleteBook(bathArgs);
}
}
数据库连接配置——Spring配置文件:
<?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: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/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:jdbc.properties"/>
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${pro.driverClass}"></property>
<property name="url" value="${pro.url}"></property>
<property name="username" value="${pro.username}"></property>
<property name="password" value="${pro.password}"></property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<context:component-scan base-package="com.dragon.jdbc"></context:component-scan>
</beans>
properties配置文件——jdbc.properties:
需要自行修改数据库名称(我的是user_db)
pro.driverClass=com.mysql.cj.jdbc.Driver
pro.url=jdbc:mysql://localhost:3306/user_db?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&useSSL=false
pro.username=root
pro.password=root
测试类:
package com.dragon.jdbc.test;
import com.dragon.jdbc.entity.Book;
import com.dragon.jdbc.service.BookService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import java.util.ArrayList;
import java.util.List;
public class test1 {
public static void main(String[] args) {
ApplicationContext context=new ClassPathXmlApplicationContext("bean8.xml");
BookService bookService=context.getBean("bookService",BookService.class);
// Book book=new Book();
// book.setBookId("1");
// book.setBookname("java");
// book.setBstatus("a");
// bookService.addBook(book);
// Book book=new Book();
// book.setBookId("1");
// book.setBookname("javaup");
// book.setBstatus("a");
// bookService.updateBook(book);
// bookService.deleteBook("1");
// System.out.println( bookService.findCount());
// Book book=bookService.finOne("1");
// System.out.println(book);
// System.out.println(bookService.findAll());
// List<Object[]> bathArgs=new ArrayList<>();
// Object[] o1={"3","java","j"};
// Object[] o2={"4","c++","c"};
// Object[] o3={"5","MySql","m"};
// bathArgs.add(o1);
// bathArgs.add(o2);
// bathArgs.add(o3);
// bookService.bathAdd(bathArgs);
// List<Object[]> bathArgs=new ArrayList<>();
// Object[] o1={"java001","j","3"};
// Object[] o2={"c++002","c","4"};
// Object[] o3={"MySql003","m","5"};
// bathArgs.add(o1);
// bathArgs.add(o2);
// bathArgs.add(o3);
// bookService.bathUpdate(bathArgs);
List<Object[]> bathArgs=new ArrayList<>();
Object[] o1={"3"};
Object[] o2={"4"};
bathArgs.add(o1);
bathArgs.add(o2);
bookService.bathDelete(bathArgs);
}
}
总结
这部分内容不需要多么详细讲解,你只要看一下封装好的那些方法是用来做什么操作的,返回值是什么,传入的参数是什么,然后就会使用了。
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