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Explicatio quattuor methodorum MyBatis ad penitus datorum

2024-07-12

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Articuli directorium

Praefatio

In Iava evolutione, MyBatis, quasi egregium iacens compage pervicacia, late in variis inceptis cum simplicibus suis conformationibus et potentiis functionibus adhibetur. Hic articulus quattuor modos scribendi SQL in tabula geographica in MyBatis singillatim introducet, et singillatim explicabit per exsecutionem notarum, exemplum usoris tabulae sumens.

1. Introductio ad MyBatis

1. Introductio ad MyBatis

MyBatis est compages semi-ORM quae in XML lima vel in annotationibus mappis SQL, operationes datorum simpliciores. Morem SQL sustentat, rationes reposuit, et destinata provectus est.

2. Directory compages

Exemplum est talis structurae simplicis projecti innixa veris Tabernis et MyBatis;

springboot-template-mybatis
│  pom.xml
│
├─src
│  └─main
│      ├─java
│      │  └─com
│      │      └─zcs
│      │          │  Application.java
│      │          │
│      │          ├─common
│      │          │      Result.java
│      │          │
│      │          ├─controller
│      │          │      UserControllerByAnnotation.java
│      │          │      UserControllerByMap.java
│      │          │      UserControllerByProvider.java
│      │          │      UserControllerByXml.java
│      │          │
│      │          ├─entity
│      │          │      UserEntity.java
│      │          │
│      │          ├─mapper
│      │          │  │  UserMapperByAnnotation.java
│      │          │  │  UserMapperByMap.java
│      │          │  │  UserMapperByProvider.java
│      │          │  │  UserMapperByXml.java
│      │          │  │
│      │          │  └─provider
│      │          │          UserProvider.java
│      │          │
│      │          └─service
│      │                  UserService.java
│      │                  UserServiceByMap.java
│      │
│      └─resources
│          │  application.yml
│          │  log4j.properties
│          │
│          └─com
│              └─zcs
│                  └─mapper
│                          UserMapperByXml.xml

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3. crea user mensam et correspondentes entitatis genus

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(50) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci

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import lombok.Data;

@Data
public class UserEntity {
    private Integer id;
    private String name;
    private Integer age;
}

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2. Scribe SQL per XML files

1. UserMapperByXml.java

import com.zcs.entity.UserEntity;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;

@Mapper
public interface UserMapperByXml {
    List<UserEntity> selectAllUsersByXml();

    boolean insertUserByXml(UserEntity user);

    boolean updateUserByXml(UserEntity user);

    boolean deleteUserByXml(Integer id);
}

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2. UserMapperByXml.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.zcs.mapper.UserMapperByXml">
    <!-- 查询所有用户 -->
    <select id="selectAllUsersByXml">
        SELECT *
        FROM user
    </select>

    <!-- 插入用户 -->
    <insert id="insertUserByXml">
        INSERT INTO user (id, name, age)
        VALUES (#{id}, #{name}, #{age})
    </insert>

    <!-- 更新用户 -->
    <update id="updateUserByXml">
        UPDATE user
        SET name = #{name},
            age  = #{age}
        WHERE id = #{id}
    </update>

    <!-- 删除用户 -->
    <delete id="deleteUserByXml">
        DELETE
        FROM user
        WHERE id = #{id}
    </delete>
</mapper>

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3. UserControllerByXml.java

import com.zcs.common.Result;
import com.zcs.entity.UserEntity;
import com.zcs.mapper.UserMapperByXml;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/usersByXml")
public class UserControllerByXml {

    @Resource
    private UserMapperByXml userMapperByXml;
    
    @GetMapping
    public Result<List<UserEntity>> selectAllUsersByAnnotation() {
        List<UserEntity> userEntities = userMapperByXml.selectAllUsersByXml();
        return Result.success("successfully", userEntities);
    }

    @PostMapping
    public Result<String> insertUserByAnnotation(@RequestBody UserEntity user) {
        boolean b = userMapperByXml.insertUserByXml(user);
        if (b) {
            return Result.success("successfully", "数据插入成功");
        }
        return Result.error(500, "数据插入失败");
    }

    @PutMapping
    public Result<String> updateUserByAnnotation(@RequestBody UserEntity user) {
        boolean b = userMapperByXml.updateUserByXml(user);
        if (b) {
            return Result.success("successfully", "数据更新成功");
        }
        return Result.error(500, "数据更新失败");
    }

    @DeleteMapping
    public Result<String> deleteUserByAnnotation(@RequestParam Integer id) {
        boolean b = userMapperByXml.deleteUserByXml(id);
        if (b) {
            return Result.success("successfully", "数据删除成功");
        }
        return Result.error(500, "数据删除失败");
    }

}

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3. Scribe SQL utens annotationibus

1. UserMapperByAnnotation.java

import com.zcs.entity.UserEntity;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserMapperByAnnotation {
    @Select("SELECT * FROM user")
    List<UserEntity> getAllUser();

    @Insert("INSERT INTO user (id, name, age) VALUES (#{id}, #{name}, #{age})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    boolean insertUser(UserEntity user);

    @Update("UPDATE user SET name = #{name}, age = #{age} WHERE id = #{id}")
    boolean updateUser(UserEntity user);

    @Delete("DELETE FROM user WHERE id = #{id}")
    boolean deleteUserById(Integer id);
}

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2. UserServiceByAnnotation.java

import com.zcs.entity.UserEntity;
import com.zcs.mapper.UserMapperByAnnotation;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

@Service
public class UserServiceByAnnotation {
    @Resource
    private UserMapperByAnnotation userMapperByAnnotation;

    public List<UserEntity> getAllUser() {
        return userMapperByAnnotation.getAllUser();
    }

    public boolean insertUser(UserEntity user) {
        return userMapperByAnnotation.insertUser(user);
    }

    public boolean updateUser(UserEntity user) {
        return userMapperByAnnotation.updateUser(user);
    }

    public boolean deleteUserById(Integer id) {
        return userMapperByAnnotation.deleteUserById(id);
    }
}

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3. UserControllerByAnnotation.java

import com.zcs.common.Result;
import com.zcs.entity.UserEntity;
import com.zcs.service.UserServiceByAnnotation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/usersByAnnotation")
public class UserControllerByAnnotation {

    @Resource
    private UserServiceByAnnotation userServiceByAnnotation;

    @GetMapping
    public Result<List<UserEntity>> getAllUser() {
        List<UserEntity> allUserM = userServiceByAnnotation.getAllUser();
        return Result.success("success", allUserM);
    }

    @PostMapping
    public Result<String> insertUser(@RequestBody UserEntity user) {
        boolean b = userServiceByAnnotation.insertUser(user);
        if (b) {
            return Result.success("success", "数据插入成功");
        }
        return Result.error(500, "数据插入失败");
    }

    @PutMapping
    public Result<String> updateUser(@RequestBody UserEntity user) {
        boolean b = userServiceByAnnotation.updateUser(user);
        if (b) {
            return Result.success("success", "数据更新成功");
        }
        return Result.error(500, "数据更新失败");
    }

    @DeleteMapping
    public Result<String> deleteUserById(@RequestParam Integer id) {
        boolean b = userServiceByAnnotation.deleteUserById(id);
        if (b) {
            return Result.success("success", "数据删除成功");
        }
        return Result.error(500, "数据删除失败");
    }

}

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4. scribe SQL usura provisum classes

1. UserProvider.java

import com.zcs.entity.UserEntity;
import org.apache.ibatis.jdbc.SQL;

public class UserProvider {
    public String selectAllUser() {
        SQL sql = new SQL();
        sql.SELECT("*");
        sql.FROM("user");

        return sql.toString();
    }

    public String insertUser(UserEntity userEntity) {
        SQL sql = new SQL();
        sql.INSERT_INTO("user");

        if (userEntity.getId() != null) {
            sql.VALUES("id", "#{id}");
        }
        if (userEntity.getName() != null) {
            sql.VALUES("name", "#{name}");
        }
        if (userEntity.getAge() != null) {
            sql.VALUES("age", "#{age}");
        }

        return sql.toString();
    }

    public String updateUser(UserEntity userEntity) {
        SQL sql = new SQL();
        sql.UPDATE("user");

        if (userEntity.getName() != null) {
            sql.SET("name = #{name}");
        }
        if (userEntity.getAge() != null) {
            sql.SET("age = #{age}");
        }

        sql.WHERE("id = #{id}");

        return sql.toString();
    }

    public String deleteUserById(Integer id) {
        SQL sql = new SQL();
        sql.DELETE_FROM("user");
        sql.WHERE("id = #{id}");

        return sql.toString();
    }
}

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2. UserMapperByProvider.java

import com.zcs.entity.UserEntity;
import com.zcs.mapper.provider.UserProvider;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface UserMapperByProvider {
    @SelectProvider(type = UserProvider.class, method = "selectAllUser")
    List<UserEntity> selectAllUser();

    @InsertProvider(type = UserProvider.class, method = "insertUser")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    boolean insertUser(UserEntity userEntity);

    @UpdateProvider(type = UserProvider.class, method = "updateUser")
    boolean updateUser(UserEntity userEntity);

    @DeleteProvider(type = UserProvider.class, method = "deleteUserById")
    boolean deleteUserById(Integer id);
}

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3. UserControllerByProvider.java

import com.zcs.common.Result;
import com.zcs.entity.UserEntity;
import com.zcs.mapper.UserMapperByProvider;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

@Slf4j
@RestController
@RequestMapping("/usersByProvider")
public class UserControllerByProvider {

    @Resource
    private UserMapperByProvider userMapper;

    @GetMapping
    public Result<List<UserEntity>> selectAllUsersByAnnotation() {
        List<UserEntity> userEntities = userMapper.selectAllUser();
        return Result.success("successfully", userEntities);
    }

    @PostMapping
    public Result<String> insertUserByAnnotation(@RequestBody UserEntity user) {
        boolean b = userMapper.insertUser(user);
        if (b) {
            return Result.success("success", "数据插入成功");
        }
        return Result.error(500, "数据插入失败");
    }

    @PutMapping
    public Result<String> updateUserByAnnotation(@RequestBody UserEntity user) {
        boolean b = userMapper.updateUser(user);
        if (b) {
            return Result.success("success", "数据更新成功");
        }
        return Result.error(500, "数据更新失败");
    }

    @DeleteMapping
    public Result<String> deleteUserByAnnotation(@RequestParam Integer id) {
        boolean b = userMapper.deleteUserById(id);
        if (b) {
            return Result.success("success", "数据删除成功");
        }
        return Result.error(500, "数据删除失败");
    }

}

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5. Transite SQL ut parametri

1. UserMapperByMap.java

import org.apache.ibatis.annotations.*;

import java.util.List;
import java.util.Map;

@Mapper
public interface UserMapperByMap {
    @Select("${sql}")
    List<Map<String, Object>> getAllUser(Map<String, Object> map);

    @Insert("${sql}")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    boolean insertUser(Map<String, Object> map);

    @Update("${sql}")
    boolean updateUser(Map<String, Object> map);

    @Delete("${sql}")
    boolean deleteUserById(Map<String, Object> map);
}

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2. UserServiceByMap.java

import com.zcs.mapper.UserMapperByMap;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;
import java.util.Map;

@Service
public class UserServiceByMap {
    @Resource
    private UserMapperByMap userMapperByMap;

    public List<Map<String, Object>> getAllUser(Map<String, Object> map) {
        String sql = "SELECT * FROM user";
        map.put("sql", sql);
        return userMapperByMap.getAllUser(map);
    }

    public boolean insertUser(Map<String, Object> map) {
        String sql = "INSERT INTO user (id, name, age) VALUES (#{id}, #{name}, #{age})";
        map.put("sql", sql);
        return userMapperByMap.insertUser(map);
    }

    public boolean updateUser(Map<String, Object> map) {
        String sql = "UPDATE user SET name = #{name}, age = #{age} WHERE id = #{id}";
        map.put("sql", sql);
        return userMapperByMap.updateUser(map);
    }

    public boolean deleteUserById(Map<String, Object> map) {
        String sql = "DELETE FROM user WHERE id = #{id}";
        map.put("sql", sql);
        return userMapperByMap.deleteUserById(map);
    }
}

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3. UserControllerByXml.java

import com.zcs.common.Result;
import com.zcs.service.UserServiceByMap;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Slf4j
@RestController
@RequestMapping("/usersByMap")
public class UserControllerByMap {

    @Resource
    private UserServiceByMap userServiceByMap;

    @GetMapping
    public Result<List<Map<String, Object>>> getAllUser() {
        HashMap<String, Object> map = new HashMap<>();
        List<Map<String, Object>> allUser = userServiceByMap.getAllUser(map);
        return Result.success("success", allUser);
    }

    @PostMapping
    public Result<String> insertUser(@RequestBody Map<String, Object> map) {
        boolean b = userServiceByMap.insertUser(map);
        if (b) {
            return Result.success("success", "数据插入成功");
        }
        return Result.error(500, "数据插入失败");
    }

    @PutMapping
    public Result<String> updateUserM(@RequestBody Map<String, Object> map) {
        boolean b = userServiceByMap.updateUser(map);
        if (b) {
            return Result.success("success", "数据更新成功");
        }
        return Result.error(500, "数据更新失败");
    }

    @DeleteMapping
    public Result<String> deleteUserByIdM(@RequestParam Map<String, Object> map) {
        boolean b = userServiceByMap.deleteUserById(map);
        if (b) {
            return Result.success("success", "数据删除成功");
        }
        return Result.error(500, "数据删除失败");
    }

}

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Summatim

Hic articulus singillatim inducit quattuor modos scribendi SQL in tabulato MyBatis, incluso XML lima utens, annotationes, classes et SQL ut parametros transmittens. Per codicem peculiarem exsecutionem, lectores melius possunt intelligere commoda et incommoda uniuscuiusque methodi et aptam methodum secundum ipsas necessitates eligere.

Personal profile

technologiae technologiae plus quam 30 annos operam dedit et in variis linguis proficit ut java, linux, javascript, php, css, etc. Multas contributiones in aperto fonte campo fecit elit documentorum statione ad communicandas quaestiones in technologia progressus ad futuram referentiam

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