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SpringBoot使用JdbcTemplate

本文是对SpringBoot使用JdbcTemplate操作数据库的一个介绍，，提供一个小的Demo供大家参考。

操作数据库的方式有很多，本文介绍使用SpringBoot结合JdbcTemplate。

新建项目

新建一个项目。pom文件中加入Jdbc依赖，完整pom如下：

<?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>com.dalaoyang</groupId>
    <artifactId>springboot_jdbc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot_jdbc</name>
    <description>springboot_jdbc</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>
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配置文件如下：

##端口号
server.port=8888

##数据库配置
##数据库地址
spring.datasource.url=jdbc:mysql://localhost:3306/test?characterEncoding=utf8&useSSL=false
##数据库用户名
spring.datasource.username=root
##数据库密码
spring.datasource.password=123456
##数据库驱动
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
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新建一个实体类User，其中需要注意的是，User类实现了RowMapper类，重写了mapRow方法，完整代码如下：

package com.dalaoyang.entity;


import org.springframework.jdbc.core.RowMapper;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * @author dalaoyang
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email yangyang@dalaoyang.cn
 * @date 2018/7/25
 */
public class User implements RowMapper<User> {
    private int id;
    private String user_name;
    private String pass_word;

    public User(int id, String user_name, String pass_word) {
        this.id = id;
        this.user_name = user_name;
        this.pass_word = pass_word;
    }

    public User() {
    }

    public User(String user_name, String pass_word) {
        this.user_name = user_name;
        this.pass_word = pass_word;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getUser_name() {
        return user_name;
    }

    public void setUser_name(String user_name) {
        this.user_name = user_name;
    }

    public String getPass_word() {
        return pass_word;
    }

    public void setPass_word(String pass_word) {
        this.pass_word = pass_word;
    }

    @Override
    public User mapRow(ResultSet resultSet, int i) throws SQLException {
        User user = new User();
        user.setId(resultSet.getInt("id"));
        user.setUser_name(resultSet.getString("user_name"));
        user.setPass_word(resultSet.getString("pass_word"));
        return user;
    }
}
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常用CURD操作大致使用以下三个方法:
1.execute方法，用于直接执行SQL语句
2.update方法，用户新增修改删除操作
3.query方法，用于查询方法

本文和往常一样，用Controller进行测试，注入JdbcTemplate。完整代码如下，下面会对测试方法进行介绍：

package com.dalaoyang.controller;

import com.dalaoyang.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author dalaoyang
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email yangyang@dalaoyang.cn
 * @date 2018/7/25
 */
@RestController
public class UserController {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    //http://localhost:8888/createTable
    @GetMapping("createTable")
    public String createTable(){
        String sql = "CREATE TABLE `user` (/n" +
                "  `id` int(11) NOT NULL AUTO_INCREMENT,/n" +
                "  `user_name` varchar(255) DEFAULT NULL,/n" +
                "  `pass_word` varchar(255) DEFAULT NULL,/n" +
                "  PRIMARY KEY (`id`)/n" +
                ") ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;/n" +
                "/n";
        jdbcTemplate.execute(sql);
        return "创建User表成功";
    }

    //http://localhost:8888/saveUserSql
    @GetMapping("saveUserSql")
    public String saveUserSql(){
        String sql = "INSERT INTO USER (USER_NAME,PASS_WORD) VALUES ('dalaoyang','123')";
        int rows= jdbcTemplate.update(sql);
        return "执行成功，影响"+rows+"行";
    }

    //http://localhost:8888/saveUser?userName=lisi&passWord=111
    @GetMapping("saveUser")
    public String saveUser(String userName,String passWord){
        int rows= jdbcTemplate.update("INSERT INTO USER (USER_NAME,PASS_WORD) VALUES (?,?)",userName,passWord);
        return "执行成功，影响"+rows+"行";
    }

    //http://localhost:8888/updateUserPassword?id=1&passWord=111
    @GetMapping("updateUserPassword")
    public String updateUserPassword(int id,String passWord){
        int rows= jdbcTemplate.update("UPDATE USER SET PASS_WORD = ? WHERE ID = ?",passWord,id);
        return "执行成功，影响"+rows+"行";
    }

    //http://localhost:8888/deleteUserById?id=1
    @GetMapping("deleteUserById")
    public String deleteUserById(int id){
        int rows= jdbcTemplate.update("DELETE FROM  USER  WHERE ID = ?",id);
        return "执行成功，影响"+rows+"行";
    }


    //http://localhost:8888/batchSaveUserSql
    @GetMapping("batchSaveUserSql")
    public String batchSaveUserSql(){
        String sql =
                "INSERT INTO USER (USER_NAME,PASS_WORD) VALUES (?,?)" ;
        List<Object[]> paramList = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            String[] arr = new String[2];
            arr[0] = "zhangsan"+i;
            arr[1] = "password"+i;
            paramList.add(arr);
        }
        jdbcTemplate.batchUpdate(sql,paramList);
        return "执行成功";
    }

    //http://localhost:8888/getUserByUserName?userName=zhangsan0
    @GetMapping("getUserByUserName")
    public List getUserByUserName(String userName){
        String sql = "SELECT * FROM USER WHERE USER_NAME = ?";
        //写法很多种
        //下面列举两种写法，都可以实现
        //List<User> list= jdbcTemplate.query(sql,new Object[]{userName}, new BeanPropertyRowMapper(User.class));
        List<User> list= jdbcTemplate.query(sql,new User(),new Object[]{userName});
        return list;
    }

    //http://localhost:8888/getMapById?id=1
    @GetMapping("getMapById")
    public Map getMapById(Integer id){
        String sql = "SELECT * FROM USER WHERE ID = ?";
        Map map= jdbcTemplate.queryForMap(sql,id);
        return map;
    }

    //http://localhost:8888/getUserById?id=1
    @GetMapping("getUserById")
    public User getUserById(Integer id){
        String sql = "SELECT * FROM USER WHERE ID = ?";
        User user= jdbcTemplate.queryForObject(sql,new User(),new Object[]{id});
        return user;
    }

}
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