MyBatis-Plus中静态工具Db的多种用法及实例分析

<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>最新版本号</version>
</dependency>

import com.baomidou.mybatisplus.core.toolkit.Db;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.toolkit.SqlHelper;

public class StudentService {

    public void insertStudent(Student student) {
        int rows = Db.insert("INSERT INTO student (name, age) VALUES (?, ?)", student.getName(), student.getAge());
        if (SqlHelper.retBool(rows)) {
            System.out.println("Insert successful");
        } else {
            System.out.println("Insert failed");
        }
    }
}

public class StudentService {

    public void updateStudent(Student student) {
        int rows = Db.update("UPDATE student SET name=?, age=? WHERE id=?", student.getName(), student.getAge(), student.getId());
        if(SqlHelper.retBool(rows)) {
            System.out.println("Update successful");
        } else {
            System.out.println("Update failed");
        }
    }
}

public class StudentService {

    public List<Student> getStudentsByAge(int age) {
        return Db.queryList("SELECT * FROM student WHERE age=?", Student.class, age);
    }
}

public class StudentService {

    public void deleteStudent(long id) {
        int rows = Db.delete("DELETE FROM student WHERE id=?", id);
        if(SqlHelper.retBool(rows)) {
            System.out.println("Delete successful");
        } else {
            System.out.println("Delete failed");
        }
    }
}