Scott 数据映射 MySQL

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;
}
}
原文链接：https://blog.csdn.net/lianghecai52171314/article/details/101469279

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