1、sqldrop 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; }}
以上就是mysql怎么实现scott数据映射的详细内容。