SpringBoot调用mysql操作

IDEA配置SpringBoot项目

SpringBoot实现增删改查

记录功能很简单，创建Controller，然后调用Service中的SQL语句进行增删改查

用到的jar包

//Gson
implementation 'com.google.code.gson:gson:2.8.5'
//json解析
implementation 'org.json:json:20160810'

1. 创建实体类

public class TestBean {
    private long id;
    private String userName;
    private String password;
    private int age;
    private String phoneNumber;
    private String headPicture;
    private Date addDate;
    private Date updateDate;
    private int state;

    @Override
    public String toString() {
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject.put("id",id);
            jsonObject.put("userName",userName);
            jsonObject.put("password",password);
            jsonObject.put("age",age);
            jsonObject.put("phoneNumber",phoneNumber);
            jsonObject.put("headPicture",headPicture);
            jsonObject.put("addDate",addDate);
            jsonObject.put("updateDate",updateDate);
            jsonObject.put("state",state);
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return jsonObject.toString();
    }

    public long getId() {
        return id;
    }

    public String getUserName() {
        return userName;
    }

    public String getPassword() {
        return password;
    }

    public int getAge() {
        return age;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public String getHeadPicture() {
        return headPicture;
    }

    public Date getAddDate() {
        return addDate;
    }

    public Date getUpdateDate() {
        return updateDate;
    }

    public int getState() {
        return state;
    }

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

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public void setHeadPicture(String headPicture) {
        this.headPicture = headPicture;
    }

    public void setAddDate(Date addDate) {
        this.addDate = addDate;
    }

    public void setUpdateDate(Date updateDate) {
        this.updateDate = updateDate;
    }

    public void setState(int state) {
        this.state = state;
    }
}

2. 创建Service，负责连接数据库的增删改查操作(这里都列出来了)

/**
 * 数据接口协议
 * **/
@Mapper
public interface TestService {
    //判断表是否存在
    @Select("SELECT table_name FROM information_schema.TABLES WHERE table_name ='AppComment'")
    String isHaveTable();

    //创建
    @Insert("CREATE TABLE IF NOT EXISTS `runoob_bbb`(" +
            "`runoob_id` INT UNSIGNED AUTO_INCREMENT," +//定义自增长
            "`runoob_title` VARCHAR(100) NOT NULL," +//不为空
            "PRIMARY KEY(`runoob_id`)" +//定义主键值对
            ")ENGINE=InnoDB DEFAULT CHARSET=utf8")
    int createComment(TestBean bean);//成功返回0

    //插入数据
    @Insert("INSERT INTO `runoob_bbb`(" +
            "`runoob_title`" +
            ")VALUES(" +
            "'不错'" +//注意字符串单引号不同
            ")")
    int addComment(TestBean bean);

    //删除数据
    @Delete("DELETE FROM `bingo_comment` WHERE `app_id`=-1")
    int deleteComment(TestBean bean);

    //修改数据
    @Update("UPDATE `runoob_bbb` SET `runoob_title`='我不服' WHERE `runoob_id`=1")
    int updateComment(TestBean bean);

    //查询数据#{userName}
    @Select("SELECT * FROM `runoob_bbb` where `runoob_id`=5")
    TestBean selectComment(TestBean bean);


    //更改表结构添加字段
    @Update("ALTER TABLE `runoob_bbb` ADD COLUMN `runoob_test` INT NOT NULL DEFAULT 0 AFTER `runoob_title`")
    int updateTableColumn();

    //更改表结构删除字段
    @Delete("ALTER TABLE `runoob_bbb` DROP COLUMN `GATEWAYID`")
    int deleteTableColumn();

    //更改表结构调整字段顺序（只能用after）
    @Update("ALTER TABLE `runoob_bbb` CHANGE `runoob_title` `runoob_title` VARCHAR(100) NOT NULL  AFTER `runoob_test`")
    int updateTableColumnOrder();

    //更改表结构删除主键自增长（先删除自增长，再删除主键，再添加）
    @Update("Alter table `runoob_bbb` change `runoob_test` `runoob_test` int(10)")
    int updateTableDeleteKeyAuto();
    //更改表结构删除主键（先删除自增长，再删除主键，再添加）
    @Delete("alter table `runoob_bbb` drop primary key")
    int updateTableDeleteKey();
    //更改表结构修改主键（先删除自增长，再删除主键，再添加）
    @Update("ALTER TABLE `runoob_bbb` add primary key (runoob_id)")
    int updateTableUpdateKey();

    //更改键的类型
//    alter table t1 change b b bigint not null;
//    alter table infos change list list tinyint not null default ‘0′;
    @Update("alter table `bingo_reply` change `reply_time` `reply_time` VARCHAR(100) NOT NULL")
    int updateTableType();

    //修改字段名 -- 正常，能修改字段类型、类型长度、默认值、注释
    @Update("alter  table bingo_comment change conment_time comment_time int(10) DEFAULT 0 COMMENT '评论时间'")
    int renameComment();


    //删除表
    @Delete("DROP TABLE `runoob_aaa`")
    int deleteTable();
    //删除表
    @Delete("DROP TABLE `runoob_bbb`")
    int deleteTable1();
    //删除表
    @Delete("DROP TABLE `runoob_tbl`")
    int deleteTable2();
}

3. 创建Controller

/**
 * 前端控制层
 * **/
@RestController
@RequestMapping("/admin")
public class TestController {
    @Autowired
    private TestService service;
    //https://store-api.bingo.fun/files/public/14/icon/x50
    @RequestMapping("addComment")
    public int setComment(TestBean bean){

        try {
            int a = service.updateTableType();
            System.out.print(a);
            return a;
        }catch (Exception e){
            System.out.print(e.toString());
            return -123;
        }
    }
}