javaweb01
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底层DBManager的数据封装
1. 创建db.properties文件driver=oracle.jdbc.driver.OracleDriverurl=jdbc:oracle:thin:@localhost:1521:orclusername=scottuserpass=tiger 2. 创建带有数据库连接池的数据库配置文件主要负责找到数据库动（驱动串），连接数据库（连接字符串），数据库连接池（List集合里放了一批数据库连接对象）package com.ruide.db;import java.beans.PropertyVetoException;import java.io.IOException;import java.io.InputStream;import java.util.Properties;import com.mchange.v2.c3p0.ComboPooledDataSource;public class DBHelper { public static ComboPooledDataSource ds; static{ ds=new ComboPooledDataSource(); InputStream in=DBHelper.class.getClassLoader().getResourceAsStream("db.properties"); Properties pro=new Properties(); try { pro.load(in); } catch (IOException e) { e.printStackTrace(); } String driver=pro.getProperty("driver"); String url=pro.getProperty("url"); String username=pro.getProperty("username"); String userpass=pro.getProperty("userpass"); try { ds.setDriverClass(driver); } catch (PropertyVetoException e) { e.printStackTrace(); } ds.setJdbcUrl(url); ds.setUser(username); ds.setPassword(userpass); }}2．DBManager数据库管理类，主要负责获取连接对象，封装结果集，基本按照5大步骤做（1）建连接（2）建预处理通道（3）sql语句绑定数据（4）得到结果集rs（5）封装结果集package com.ruide.db;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.SQLException;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import com.ruide.mapper.IMapper;public class DBManager{ Connection conn=null; PreparedStatement pstm=null; ResultSet rs=null; public Connection getconn()throws SQLException{ //返回连接池对象 return DBHelper.ds.getConnection(); } //1增删改函数 public int executeUpdate(String sql,Object[]params)throws SQLException{ //建连接 try { conn=this.getconn(); //建预处理通道 pstm=conn.prepareStatement(sql); if(params!=null){ for (int i = 0; i < params.length; i++) { pstm.setObject(i+1, params[i]); } } //执行sql int result=pstm.executeUpdate(); return result; } catch (SQLException e) { e.printStackTrace(); throw e; }finally{ try { pstm.close(); conn.close(); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } //2对象查询函数 public List executeQueryObjectList(String sql,Object[]params,IMapper map)throws SQLException{ try { //建连接 conn=this.getconn(); //建通道 pstm=conn.prepareStatement(sql); //sql语句绑定数据 if(params!=null){ for(int i=0;i<params.length;i++){ pstm.setObject(i+1, params[i]); } } //得到结果集 rs=pstm.executeQuery(); //封装结果集 List list=map.mapper(rs); return list; } catch (SQLException e) { e.printStackTrace(); throw e; }finally{ try { rs.close(); pstm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } } //3总条数查询 public int executeTotal(String sql,Object[]params)throws SQLException{ try { //建连接 conn=this.getconn(); //建预处理通道 pstm=conn.prepareStatement(sql); //sql语句绑定数据 if(params!=null){ for (int i = 0; i < params.length; i++) { pstm.setObject(i+1, params[i]); } } //得到结果集 rs=pstm.executeQuery(); //处理结果集 rs.next(); int total=rs.getInt(1); return total; } catch (SQLException e) { e.printStackTrace(); throw e; }finally{ try { rs.close(); pstm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } } //4.List集合的 数组方式封装结果集 public List<Object[]> executeQueryArrayList(String sql,Object[] params)throws SQLException{ try { conn=this.getconn(); pstm=conn.prepareStatement(sql); if(params!=null){ for (int i = 0; i < params.length; i++) { pstm.setObject(i+1, params[i]); } } rs=pstm.executeQuery(); ResultSetMetaData rsmd=rs.getMetaData(); int count=rsmd.getColumnCount(); List<Object[]> list=new ArrayList<Object[]>(); while(rs.next()){ Object[] obj=new Object[count]; for (int i = 0; i < obj.length; i++) { obj[i]=rs.getObject(i+1); } list.add(obj); } return list; } catch (SQLException e) { e.printStackTrace(); throw e; }finally{ try { rs.close(); pstm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } } //5.List集合的 HashMap方式封装结果集 public List<Map<String,Object>> executeQueryMapList(String sql,Object []params)throws SQLException{ try { conn=this.getconn(); pstm=conn.prepareStatement(sql); if(params!=null){ for (int i = 0; i < params.length; i++) { pstm.setObject(i+1, params[i]); } } rs=pstm.executeQuery(); ResultSetMetaData rsmd=rs.getMetaData(); int count=rsmd.getColumnCount(); List<Map<String,Object>> list=new ArrayList<Map<String,Object>>(); while(rs.next()){ Map<String,Object> map=new HashMap<String,Object>(); for (int i = 0; i < count; i++) { String name=rsmd.getColumnName(i+1); Object values=rs.getObject(name); map.put(name,values); } list.add(map); } return list; } catch (SQLException e) { e.printStackTrace(); throw e; }finally{ try { rs.close(); pstm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); } } } //6.二维数组方式封装数据 public Object[][] executeQueryArray(String sql,Object []params)throws SQLException{ try { List<Object[]> list=this.executeQueryArrayList(sql, params); Object[][] obj=new Object[list.size()][]; for(int i=0;i<obj.length;i++){ obj[i] =list.get(i); } return obj; } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); throw e; }finally{ try { rs.close(); pstm.close(); conn.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }2. VO包中主要是提取出的对象属性，里面有getXXX方法和setXXX方法package com.ruide.vo;public class Dept { private int deptno; private String dname; private String loc; public int getDeptno() { return deptno; } public void setDeptno(int 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; } }package com.ruide.vo;public class Emp { private int empno; private String ename; private String job; private int mgr; private String hiredate; private double sal; private double comm; private int deptno; public int getEmpno() { return empno; } public void setEmpno(int 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 int getMgr() { return mgr; } public void setMgr(int mgr) { this.mgr = mgr; } public String getHiredate() { return hiredate; } public void setHiredate(String 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 int getDeptno() { return deptno; } public void setDeptno(int deptno) { this.deptno = deptno; }}3. mapper包中主要负责封装结果集，供List集合的对象方式调用package com.ruide.mapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;public interface IMapper { public List mapper(ResultSet rs)throws SQLException;}package com.ruide.mapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import com.ruide.vo.Dept;public class DeptMapper implements IMapper{ public List mapper(ResultSet rs)throws SQLException{ List<Dept> list=new ArrayList<Dept>(); while(rs.next()){ int deptno=rs.getInt(1); String dname=rs.getString(2); String loc=rs.getString(3); Dept d=new Dept(); d.setDeptno(deptno); d.setDname(dname); d.setLoc(loc); list.add(d); } return list; }}package com.ruide.mapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List;import com.ruide.vo.Emp;public class EmpMapper implements IMapper{ public List mapper(ResultSet rs)throws SQLException{ List<Emp> list=new ArrayList(); while(rs.next()){ int empno=rs.getInt(1); String ename=rs.getString(2); String job=rs.getString(3); int mgr=rs.getInt(4); //String hiredate=rs.getString(5); java.sql.Date d=rs.getDate(5); //java.sql.Date 是 java.util.Date子类 SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); String hiredate=sdf.format(d); double sal=rs.getDouble(6); double comm=rs.getDouble(7); int deptno=rs.getInt(8); Emp e=new Emp(); e.setEmpno(empno); e.setEname(ename); e.setJob(job); e.setMgr(mgr); e.setHiredate(hiredate); e.setSal(sal); e.setComm(comm); e.setDeptno(deptno); list.add(e); } return list; }}4. DAO模式的包主要负责具体的SQL语句，和参数变量，通过调用DBManager中的方法，来得到封装好的结果集，供用户调用。该包中共有9个方法3个增（save）删（delete）改（merge）和6个查询方法书写步骤：（1）写SQL语句（2）初始化数组（3）创建DBManager对象（4）调用方法package com.ruide.dao;import java.sql.SQLException;import java.util.List;import java.util.Map;import com.ruide.db.DBManager;import com.ruide.mapper.DeptMapper;import com.ruide.mapper.IMapper;import com.ruide.vo.Dept;public class DeptDAO { //增加 public int save(Dept d)throws SQLException{ String sql=" insert into dept values(?,?,?) "; Object []params={d.getDeptno(),d.getDname(),d.getLoc()}; DBManager db=new DBManager(); int hang=db.executeUpdate(sql, params); return hang; } //修改 public int merge(Dept d)throws SQLException{ String sql="update dept set dname=?,loc=? where deptno=?"; Object []params={d.getDname(),d.getLoc(),d.getDeptno()}; DBManager db=new DBManager(); return db.executeUpdate(sql, params); } //删除 public int delete(int deptno)throws SQLException{ String sql=" delete from dept where deptno=? "; Object []params={deptno}; DBManager db=new DBManager(); return db.executeUpdate(sql, params); } //对象查询语句 public List queryObjectList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.deptno,A.dname,A.loc from "; sql+=" (select d.*,rownum rn from dept d) A "; sql+=" where rn>? and rownum<=? "; Object[] params={(pagenow-1)*pagesize,pagesize}; IMapper mapper=new DeptMapper(); DBManager db=new DBManager(); List list=db.executeQueryObjectList(sql,params, mapper); return list; } //总条数查询 public int querytotal()throws SQLException{ String sql="select count(*) from dept "; DBManager db=new DBManager(); int total=db.executeTotal(sql, null); return total; } //list 数组查询 public List<Object[]> queryObjectArrayList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.* from "; sql+=" (select d.*,rownum rn from dept d) A "; sql+=" where rn>? and rownum<=? "; Object []params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); return db.executeQueryArrayList(sql, params); } //list HashMap查询 public List<Map<String,Object>> queryMapList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+="select A.* from "; sql+=" (select d.*,rownum rn from dept d) A "; sql+=" where rn>? and rownum<=? "; Object[] params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); return db.executeQueryMapList(sql, params); } //二维数组查询 public Object[][] queryObjectArray(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+="select A.* from "; sql+=" (select d.*,rownum rn from dept d) A "; sql+=" where rn>? and rownum<=? "; Object[]params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); return db.executeQueryArray(sql, params); } //特定对象查询（根据主键） public Dept queryById(int deptno)throws SQLException{ String sql="select * from dept where deptno=? "; Object[] params={deptno}; IMapper mapper=new DeptMapper(); DBManager db=new DBManager(); List<Dept> list=db.executeQueryObjectList(sql, params, mapper); Dept d=list.get(0); return d; } public List queryAll()throws SQLException{ String sql="select *from dept"; IMapper mapper=new DeptMapper(); DBManager db=new DBManager(); List<Dept> list=db.executeQueryObjectList(sql, null, mapper); return list; }}package com.ruide.dao;import java.sql.SQLException;import java.util.List;import java.util.Map;import com.ruide.db.DBManager;import com.ruide.mapper.EmpMapper;import com.ruide.mapper.IMapper;import com.ruide.vo.Emp;public class EmpDAO { //1.增加 public int save(Emp e)throws SQLException{ String sql=" insert into emp values(?,?,?,?,to_date(?,'yyyy-MM-dd'),?,?,?) "; Object[]params={e.getEmpno(),e.getEname(),e.getJob(),e.getMgr(),e.getHiredate(),e.getSal(),e.getComm(),e.getDeptno()}; DBManager db=new DBManager(); return db.executeUpdate(sql, params); } //2.修改 public int merge(Emp e)throws SQLException{ String sql="update emp set ename=?,job=?,mgr=?,hiredate=to_date(?,'yyyy-MM-dd'),sal=?,comm=?,deptno=? where empno=?"; Object[]params={e.getEname(),e.getJob(),e.getMgr(),e.getHiredate(),e.getSal(),e.getComm(),e.getDeptno(),e.getEmpno()}; DBManager db=new DBManager(); return db.executeUpdate(sql, params); } //3.删除 public int delete(int empno)throws SQLException{ String sql="delete from emp where empno=?"; Object[]params={empno}; DBManager db=new DBManager(); return db.executeUpdate(sql, params); } //4.总条数查询 public int queryTotal()throws SQLException{ String sql=" select count(*) from emp "; DBManager db=new DBManager(); int total=db.executeTotal(sql, null); return total; } //5.根据主键查询 public Emp queryById(int empno)throws SQLException{ String sql=" select *from emp where empno=? "; Object []params={empno}; IMapper mapper=new EmpMapper(); DBManager db=new DBManager(); List<Emp> list=db.executeQueryObjectList(sql, params, mapper); Emp e=list.get(0); return e; } //6.List 集合对象查询 public List queryObjectList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.empno,A.ename,A.job,A.mgr,A.hiredate,A.sal,A.comm,A.deptno from "; sql+=" (select rownum rn,e.* from emp e ) A "; sql+=" where rn>? and rownum<=? "; Object[] params={(pagenow-1)*pagesize,pagesize}; IMapper mapper=new EmpMapper(); DBManager db=new DBManager(); List<Emp> list=db.executeQueryObjectList(sql,params, mapper); return list; } //7.List 集合数组的查询 public List<Object[]> queryObjectArrayList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.* from "; sql+=" (select e.*,rownum rn from emp e ) A "; sql+=" where rn>? and rownum<=?"; Object []params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); return db.executeQueryArrayList(sql, params); } //8.List 集合Map方式查询 public List<Map<String,Object>> queryMapList(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.* from "; sql+=" (select e.*,rownum rn from emp e ) A "; sql+=" where rn>? and rownum<=? "; Object[]params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); return db.executeQueryMapList(sql, params); } //二维数组方式查询 public Object[][] queryObjectArray(int pagesize,int pagenow)throws SQLException{ String sql=""; sql+=" select A.* from "; sql+=" (select e.*,rownum rn from emp e ) A "; sql+=" where rn>? and rownum<=? "; Object[]params={(pagenow-1)*pagesize,pagesize}; DBManager db=new DBManager(); Object[][] obj=db.executeQueryArray(sql, params); return obj; } public List queryAll()throws SQLException{ String sql="select *from emp "; IMapper mapper=new EmpMapper(); DBManager db=new DBManager(); List<Emp> list=db.executeQueryObjectList(sql, null, mapper); return list; }}5.test包中主要是用户输入的数据，从来测试以上的方法package com.ruide.test;import java.sql.SQLException;import java.util.List;import java.util.Map;import java.util.Scanner;import com.ruide.dao.DeptDAO;import com.ruide.dao.EmpDAO;import com.ruide.vo.Dept;import com.ruide.vo.Emp;public class UserShuju { //dept增加 public void dinsert(){ System.out.println("对dept表的增加数据操作"); Scanner sca=new Scanner(System.in); System.out.println("请输入您要增加的部门编号"); int deptno=sca.nextInt(); System.out.println("请输入您要增加的部门名称"); String dname=sca.next(); System.out.println("请输入您要增加的部门地址"); String loc=sca.next(); Dept d=new Dept(); d.setDeptno(deptno); d.setDname(dname); d.setLoc(loc); DeptDAO dao=new DeptDAO(); try { int hang=dao.save(d); System.out.println("成功插入了"+hang+"条数据"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //dept 修改 public void dupdate() { System.out.println("对dept表的修改操作"); Scanner sca=new Scanner(System.in); System.out.println("请输入您要修改的部门编号"); int deptno=sca.nextInt(); System.out.println("请输入您要修改的部门名称"); String dname=sca.next(); System.out.println("请输入您要修改的部门地址"); String loc=sca.next(); Dept d=new Dept(); d.setDeptno(deptno); d.setDname(dname); d.setLoc(loc); DeptDAO dao=new DeptDAO(); try { int hang=dao.merge(d); System.out.println("成功修改了"+hang+"条数据"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //dept 删除 public void ddelete(){ System.out.println("对dept表的删除操作"); Scanner sca=new Scanner(System.in); System.out.println("请您输入要删除的部门编号"); int deptno=sca.nextInt(); Dept d=new Dept(); d.setDeptno(deptno); DeptDAO dao=new DeptDAO(); try { int hang =dao.delete(d); System.out.println("成功删除了"+hang+"条数据"); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //1.dept list Object 查询 public void dObjectList(){ System.out.println("使用List的对象方式查询"); Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的当前页数"); int pagenow=sca.nextInt(); System.out.println("请您输入每页大小"); int pagesize=sca.nextInt(); try { DeptDAO dao=new DeptDAO(); int total=dao.querytotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页码"+pagenow); List<Dept> list=dao.queryObjectList(pagesize, pagenow); for(Dept d:list){ System.out.println(d.getDeptno()+" "+d.getDname()+" "+d.getLoc()); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //2.dept 主键方式查询 public void dByIdSelect(){ System.out.println("使用主键查询特定对象"); Scanner sca=new Scanner(System.in); System.out.println("请输入您要查询的部门编号"); int deptno=sca.nextInt(); Dept d=new Dept(); d.setDeptno(deptno); DeptDAO dao=new DeptDAO(); try { d=dao.queryById(deptno); System.out.println(d.getDeptno()+" "+d.getDname()+" "+d.getLoc()); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //3.List集合 ObjectArray方法查询 public void dObjectArrayList(){ System.out.println("使用List的数组方式查询"); Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的当前页码"); int pagenow=sca.nextInt(); System.out.println("请您输入每页大小"); int pagesize=sca.nextInt(); DeptDAO dao=new DeptDAO(); try { int total=dao.querytotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页码"+pagenow); List<Object[]> list=dao.queryObjectArrayList(pagesize, pagenow); for(int i=0;i<list.size();i++){ Object[] obj=list.get(i); for (int j = 0; j < obj.length; j++) { System.out.print(obj[j]+" "); } System.out.println(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //4.List集合 Map方式查询数据 public void dMapList(){ System.out.println("使用List的Map方式查询"); Scanner sca=new Scanner(System.in); System.out.println("请您输入每页大小"); int pagesize=sca.nextInt(); System.out.println("请您输入要查询的当前页码"); int pagenow=sca.nextInt(); try { DeptDAO dao=new DeptDAO(); int total=dao.querytotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页"+pagenow); List<Map<String,Object>> list=dao.queryMapList(pagesize, pagenow); for (int i = 0; i < list.size(); i++) { Map<String,Object> map=list.get(i); Object deptno=map.get("DEPTNO"); Object dname=map.get("DNAME"); Object loc=map.get("LOC"); System.out.println(deptno+" "+dname+" "+loc); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //5.二维数组方式查询 public void dObjectArray() { System.out.println("使用二维数组方式查询"); Scanner sca=new Scanner(System.in); System.out.println("请输入您要查询的当前页码"); int pagenow=sca.nextInt(); System.out.println("请输入每页大小"); int pagesize=sca.nextInt(); DeptDAO dao=new DeptDAO(); try { int total=dao.querytotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("数据总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页"+pagenow); Object[][]obj=dao.queryObjectArray(pagesize, pagenow); for (int i = 0; i < obj.length; i++) { Object[]arr=obj[i]; for(int j=0;j<arr.length;j++){ System.out.print(arr[j]+" "); } System.out.println(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } ///////////对Emp表的操作////////////// //1.增加 public void empsave(){ Scanner sca=new Scanner(System.in); System.out.println("请输入要增加的员工编号"); int empno=sca.nextInt(); System.out.println("请输入要增加的员工姓名"); String ename=sca.next(); System.out.println("请输入要增加的员工工作"); String job=sca.next(); System.out.println("请输入要增加的经理编号"); int mgr=sca.nextInt(); System.out.println("请输入要增加的入职日期"); String hiredate=sca.next(); System.out.println("请输入要增加的工资"); double sal=sca.nextDouble(); System.out.println("请输入要增加的奖金"); double comm=sca.nextDouble(); System.out.println("请输入员工所属的部门编号"); int deptno=sca.nextInt(); Emp e=new Emp(); e.setEmpno(empno); e.setEname(ename); e.setJob(job); e.setMgr(mgr); e.setHiredate(hiredate); e.setSal(sal); e.setComm(comm); e.setDeptno(deptno); EmpDAO edao=new EmpDAO(); try { int hang=edao.save(e); System.out.println("成功增加了"+hang+"条数据"); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } //2.修改 public void empmerge() { Scanner sca=new Scanner(System.in); System.out.println("请输入您要修改的员工编号"); int empno=sca.nextInt(); System.out.println("请输入您要修改的员工名称"); String ename=sca.next(); System.out.println("请输入您要修改的员工工作"); String job=sca.next(); System.out.println("请输入您要修改的经理编号"); int mgr=sca.nextInt(); System.out.println("请输入您要修改的日期"); String hiredate=sca.next(); System.out.println("请输入您要修改的员工薪资"); double sal=sca.nextDouble(); System.out.println("请输入您要修改的员工奖金"); double comm=sca.nextDouble(); System.out.println("请输入您要修改的员工所属部门编号"); int deptno=sca.nextInt(); Emp e=new Emp(); e.setEmpno(empno); e.setEname(ename); e.setJob(job); e.setMgr(mgr); e.setHiredate(hiredate); e.setSal(sal); e.setComm(comm); e.setDeptno(deptno); EmpDAO edao=new EmpDAO(); try { int hang=edao.merge(e); System.out.println("成功修改了"+hang+"条数据"); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } //删除 public void empdelete() { Scanner sca=new Scanner(System.in); System.out.println("请输入您要删除的员工编号"); int empno=sca.nextInt(); Emp e=new Emp(); e.setEmpno(empno); EmpDAO edao=new EmpDAO(); try { int hang=edao.delete(e); System.out.println("成功删除了"+hang+"条数据"); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } //4.根据主键查询 public void empById() { Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的员工编号"); int empno=sca.nextInt(); Emp e=new Emp(); e.setEmpno(empno); EmpDAO edao=new EmpDAO(); try { e=edao.queryById(empno); System.out.println(e.getEmpno()+" "+e.getEname()+" "+e.getJob()+" "+e.getMgr()+" "+e.getHiredate()+" "+e.getSal()+" "+e.getComm()+" "+e.getDeptno()); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } //5.对象查询 public void empObjectList() { Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的页码"); int pagenow=sca.nextInt(); System.out.println("请您输入每页大小"); int pagesize=sca.nextInt(); EmpDAO edao=new EmpDAO(); try { int total=edao.queryTotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("数据总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页"+pagenow); List<Emp> list=edao.queryObjectList(pagesize, pagenow); for(int i=0;i<list.size();i++){ Emp e=list.get(i); int empno=e.getEmpno(); String ename=e.getEname(); String job=e.getJob(); int mgr=e.getMgr(); String hiredate=e.getHiredate(); double sal=e.getSal(); double comm=e.getComm(); int deptno=e.getDeptno(); System.out.println(empno+" "+ename+" "+job+" "+mgr+" "+hiredate+" "+sal+" "+comm+" "+deptno); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } //6.List集合的数组方式查询 public void empArrayList() { Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的页码"); int pagenow=sca.nextInt(); System.out.println("请您输入每页的大小"); int pagesize=sca.nextInt(); try { EmpDAO edao=new EmpDAO(); int total=edao.queryTotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页码"+pagenow); List<Object[]> list=edao.queryObjectArrayList(pagesize, pagenow); for (int i = 0; i < list.size(); i++) { Object[]obj=list.get(i); for (int j = 0; j < obj.length; j++) { System.out.print(obj[j]+" "); } System.out.println(); } } catch (SQLException e) { e.printStackTrace(); } } //7.List集合的Map方式查询 public void empMapList() { Scanner sca=new Scanner(System.in); System.out.println("请您输入要查询的页码"); int pagenow=sca.nextInt(); System.out.println("请您输入每页的大小"); int pagesize=sca.nextInt(); try { EmpDAO edao=new EmpDAO(); int total=edao.queryTotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页"+pagenow); List<Map<String,Object>> list=edao.queryMapList(pagesize, pagenow); for (int i = 0; i < list.size(); i++) { Map<String,Object> map=list.get(i); Object empno=map.get("EMPNO"); Object ename=map.get("ENAME"); Object job=map.get("JOB"); Object mgr=map.get("MGR"); Object hiredate=map.get("HIREDATE"); Object sal=map.get("SAL"); Object comm=map.get("COMM"); Object deptno=map.get("DEPTNO"); System.out.println(empno+" "+ename+" "+job+" "+mgr+" "+hiredate+" "+sal+" "+comm+" "+deptno); } } catch (SQLException e) { e.printStackTrace(); } } //8. 二维数组方式查询 public void empArray() { Scanner sca=new Scanner(System.in); System.out.println("请输入您要查询的页码"); int pagenow=sca.nextInt(); System.out.println("请您输入每页的大小"); int pagesize=sca.nextInt(); try { EmpDAO edao=new EmpDAO(); int total=edao.queryTotal(); int pagetotal=(total-1)/pagesize+1; System.out.println("总页数"+pagetotal); System.out.println("数据总条数"+total); System.out.println("每页大小"+pagesize); System.out.println("当前页码"+pagenow); Object [][] obj=edao.queryObjectArray(pagesize, pagenow); for (int i = 0; i < obj.length; i++) { Object[]arr=obj[i]; for (int j = 0; j < arr.length; j++) { System.out.print(arr[j]+" "); } System.out.println(); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}package com.ruide.test;import java.util.Scanner;public class UserXuanze { public void usercaidan(){ Scanner sca=new Scanner(System.in); System.out.println("请输入您要操作的对象 1.部门表 2.员工表 3.退出"); int b=sca.nextInt(); UserXuanze ux=new UserXuanze(); if(b==1){ ux.deptxuanze(); }else if(b==2){ ux.empxuanze(); }else{ System.exit(1); } } public void deptxuanze(){ Scanner sca=new Scanner(System.in); System.out.println("请您选择针对Dept表的操作：1.保存数据 2.修改数据 3.删除数据 4.List的对象查询 5.根据主键的查询 "); System.out.println("6.List的数组方式查询 7.List的Map方式查询 8.二维数组方式查询 9.返回上一个菜单 10.退出操作"); int d=sca.nextInt(); UserShuju us=new UserShuju(); if(d==1){ us.dinsert(); deptxuanze(); }else if(d==2){ us.dupdate(); deptxuanze(); }else if(d==3){ us.ddelete(); deptxuanze(); }else if(d==4){ us.dObjectList(); deptxuanze(); }else if(d==5){ us.dByIdSelect(); deptxuanze(); }else if(d==6){ us.dObjectArrayList(); deptxuanze(); }else if(d==7){ us.dMapList(); deptxuanze(); }else if(d==8){ us.dObjectArray(); deptxuanze(); }else if(d==9){ usercaidan(); }else{ System.exit(1); } } public void empxuanze(){ Scanner sca=new Scanner(System.in); System.out.println("请您选择针对Emp表的操作：1.保存数据 2.修改数据 3.删除数据 4.List的对象查询 5.根据主键的查询 "); System.out.println("6.List的数组方式查询 7.List的Map方式查询 8.二维数组方式查询9.返回上一个菜单 10.退出操作"); int e=sca.nextInt(); UserShuju sj=new UserShuju(); if(e==1){ sj.empsave(); empxuanze(); }else if(e==2){ sj.empmerge(); empxuanze(); }else if(e==3){ sj.empdelete(); empxuanze(); }else if(e==4){ sj.empObjectList(); empxuanze(); }else if(e==5){ sj.empById(); empxuanze(); }else if(e==6){ sj.empArrayList(); empxuanze(); }else if(e==7){ sj.empMapList(); empxuanze(); }else if(e==8){ sj.empArray(); empxuanze(); }else if(e==9){ usercaidan(); }else{ System.exit(1); } } }package com.ruide.test;import java.util.Scanner;public class Testmain { public static void main(String[] args) { UserXuanze us=new UserXuanze(); us.usercaidan(); }} 0 0
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