1、SQL
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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
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/** * 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
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/** * 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
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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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原文链接:https://blog.csdn.net/lianghecai52171314/article/details/101469279