Scott 数据 映射 MySQL代码实现分享

1、sql

drop table if exists `tb_dept`;
create table `tb_dept`  (
  `deptno` tinyint(2) unsigned not null  comment '部门编号',
  `dname` varchar(14) character set utf8 collate utf8_general_ci null default null comment '部门名称',
  `loc` varchar(13) character set utf8 collate utf8_general_ci null default null comment '部门地址',
  primary key (`deptno`) using btree
) engine = innodb  character set = utf8 collate = utf8_general_ci row_format = dynamic;

insert into `tb_dept` values (10, 'accounting', 'new york');
insert into `tb_dept` values (20, 'research', 'dallas');
insert into `tb_dept` values (30, 'sales', 'chicago');
insert into `tb_dept` values (40, 'operations', 'boston');

-------------------------------------------------------------------
drop table if exists `tb_emp`;
create table `tb_emp`  (
  `empno` int(4) unsigned not null,
  `ename` varchar(10) character set utf8 collate utf8_general_ci null default null,
  `job` varchar(9) character set utf8 collate utf8_general_ci null default null,
  `mgr` int(4) unsigned  null default null,
  `hiredate` date null default null,
  `sal` decimal(7, 2) null default null,
  `comm` decimal(7, 2) null default null,
  `deptno` tinyint(2) unsigned null default null,
  primary key (`empno`) using btree,
  index `deptno`(`deptno`) using btree,
  constraint `tb_emp_ibfk_1` foreign key (`deptno`) references `tb_dept` (`deptno`) on delete restrict on update restrict
) engine = innodb character set = utf8 collate = utf8_general_ci row_format = dynamic;

insert into `tb_emp` values (7369, 'smith', 'clerk', 7902, '1980-12-17', 800.00, null, 20);
insert into `tb_emp` values (7499, 'allen', 'salesman', 7698, '1981-02-20', 1600.00, 300.00, 30);
insert into `tb_emp` values (7521, 'ward', 'salesman', 7698, '1981-02-22', 1250.00, 500.00, 30);
insert into `tb_emp` values (7566, 'jones', 'manager', 7839, '1981-04-02', 2975.00, null, 20);
insert into `tb_emp` values (7654, 'martin', 'salesman', 7698, '1981-09-28', 1250.00, 1400.00, 30);
insert into `tb_emp` values (7698, 'blake', 'manager', 7839, '1981-05-01', 2850.00, null, 30);
insert into `tb_emp` values (7782, 'clark', 'manager', 7839, '1981-06-09', 2450.00, null, 10);
insert into `tb_emp` values (7788, 'scott', 'analyst', 7566, '1987-04-19', 3000.00, null, 20);
insert into `tb_emp` values (7839, 'king', 'president', null, '1981-11-17', 5000.00, null, 10);
insert into `tb_emp` values (7844, 'turner', 'salesman', 7698, '1981-09-08', 1500.00, 0.00, 30);
insert into `tb_emp` values (7876, 'adams', 'clerk', 7788, '1987-05-23', 1100.00, null, 20);
insert into `tb_emp` values (7900, 'james', 'clerk', 7698, '1981-12-03', 950.00, null, 30);
insert into `tb_emp` values (7902, 'ford', 'analyst', 7566, '1981-12-03', 3000.00, null, 20);
insert into `tb_emp` values (7934, 'miller', 'clerk', 7782, '1982-01-23', 1300.00, null, 10);

2、实体类

2.1、dept.java

/**
 * 部门
 * @author hc
 *
 */
public class dept {
    /**
     * 部门编号
     */
    private integer deptno;
    /**
     * 部门名称
     */
    private string dname;
    /**
     * 部门地址
     */
    private string loc;

    public dept() {
    }

    public dept(integer deptno, string dname, string loc) {
        this.deptno = deptno;
        this.dname = dname;
        this.loc = loc;
    }

    public integer getdeptno() {
        return deptno;
    }

    public void setdeptno(integer deptno) {
        this.deptno = deptno;
    }

    public string getdname() {
        return dname;
    }

    public void setdname(string dname) {
        this.dname = dname;
    }

    public string getloc() {
        return loc;
    }

    public void setloc(string loc) {
        this.loc = loc;
    }

    @override
    public string tostring() {
        return "dept{" +
                "deptno=" + deptno +
                ", dname='" + dname + '\'' +
                ", loc='" + loc + '\'' +
                '}';
    }
}

2.2、emp.java

/**
 * 员工
 * @author hc
 */
public class emp {
    /**
     * 员工编号
     */
    private integer empno;
    /**
     * 员工姓名
     */
    private string ename;
    /**
     * 工作
     */
    private string job;
    /**
     * 上级领导编号
     */
    private integer mgr;
    /**
     * 受雇日期
     */
    private localdate hiredate;
    /**
     * 薪资
     */
    private double sal;
    /**
     * 奖金
     */
    private double comm;
    /**
     * 部门编号
     */
    private integer deptno;

    public emp() {
    }

    public emp(integer empno, string ename, string job, integer mgr, localdate hiredate, double sal, double comm, integer deptno) {
        this.empno = empno;
        this.ename = ename;
        this.job = job;
        this.mgr = mgr;
        this.hiredate = hiredate;
        this.sal = sal;
        this.comm = comm;
        this.deptno = deptno;
    }

    public integer getempno() {
        return empno;
    }

    public void setempno(integer empno) {
        this.empno = empno;
    }

    public string getename() {
        return ename;
    }

    public void setename(string ename) {
        this.ename = ename;
    }

    public string getjob() {
        return job;
    }

    public void setjob(string job) {
        this.job = job;
    }

    public integer getmgr() {
        return mgr;
    }

    public void setmgr(integer mgr) {
        this.mgr = mgr;
    }

    public localdate gethiredate() {
        return hiredate;
    }

    public void sethiredate(localdate hiredate) {
        this.hiredate = hiredate;
    }

    public double getsal() {
        return sal;
    }

    public void setsal(double sal) {
        this.sal = sal;
    }

    public double getcomm() {
        return comm;
    }

    public void setcomm(double comm) {
        this.comm = comm;
    }

    public integer getdeptno() {
        return deptno;
    }

    public void setdeptno(integer deptno) {
        this.deptno = deptno;
    }

    @override
    public string tostring() {
        return "emp{" +
                "empno=" + empno +
                ", ename='" + ename + '\'' +
                ", job='" + job + '\'' +
                ", mgr=" + mgr +
                ", hiredate=" + hiredate +
                ", sal=" + sal +
                ", comm=" + comm +
                ", deptno=" + deptno +
                '}';
    }
}

3、数据库模拟代码

public class db {
    private static list<emp> emps = new arraylist<>();
    private static list<dept> depts = new arraylist<>();

    static {
        depts.add(new dept(10,"accounting","newyork"));
        depts.add(new dept(20,"research","dallas"));
        depts.add(new dept(30,"sales","chicago"));
        depts.add(new dept(40,"operations","boston"));

        emps.add(new emp(7369, "smith", "clerk", 7902,localdate.of(1980, 12, 17), 800d, null, 20));
        emps.add(new emp(7499, "allen", "salesman", 7698, localdate.of(1981, 2, 20), 1600d, 300d, 30));
        emps.add(new emp(7521, "ward", "salesman", 7698, localdate.of(1981, 2, 22), 1250d, 500d, 30));
        emps.add(new emp(7566, "jones", "manager", 7893, localdate.of(1981, 4, 2), 2975d, null, 20));
        emps.add(new emp(7654, "martin", "salesman", 7698, localdate.of(1981, 9, 28), 1250d, 1400d, 30));
        emps.add(new emp(7698, "blake", "manager", 7839, localdate.of(1981, 5, 1), 2850d, null, 30));
        emps.add(new emp(7782, "clark", "manager", 7839, localdate.of(1981, 6, 9), 2450d, 600d, 10));
        emps.add(new emp(7788, "scott", "analyst", 7566, localdate.of(1987, 4, 19), 3000d, null, 20));
        emps.add(new emp(7839, "king", "president", null, localdate.of(1981, 11, 17), 5000d, null, 10));
        emps.add(new emp(7844, "turner", "salesman", 7698, localdate.of(1981, 9, 8), 1500d, null, 30));
        emps.add(new emp(7876, "adams", "clerk", 7788, localdate.of(1987, 5, 23), 1100d, 350d, 20));
        emps.add(new emp(7900, "james", "clerk", 7698, localdate.of(1981, 12, 3), 950d, null, 30));
        emps.add(new emp(7902, "ford", "analyst", 7566, localdate.of(1981, 12, 3), 3000d, null, 20));
        emps.add(new emp(7934, "miller", "clerk", 7782, localdate.of(1982, 1, 23), 1300d, 400d, 10));
    }

    public static list<emp> getemps() {
        return emps;
    }

    public static list<dept> getdepts() {
        return depts;
    }
}

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