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测试数据m = 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测试数据m = 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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