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dao file

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master
Vie 5 years ago
parent b2c17bcc07
commit 634cd11b18
4 changed files with 1119 additions and 0 deletions
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224
dao文件/AdminDao.java
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package com.dao;
import com.db.DBHelper;
import com.bean.AdminBean;
import java.util.*;
import java.sql.*;
public class AdminDao {
//验证登录
public String CheckLogin(String username, String password){
System.out.println("user"+username+"password"+password);
String id = null;
String sql="select * from Admin where Admin_Username='"+username+"' and Admin_Password='"+password+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
id = rs.getString("Admin_ID");
}
}
catch(SQLException ex){}
return id;
}
//验证密码
public boolean CheckPassword(String id, String password){
boolean ps = false;
String sql="select * from Admin where Admin_ID='"+id+"' and Admin_Password='"+password+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
ps=true;
}
}
catch(SQLException ex){}
return ps;
}
//获取列表
public List<AdminBean> GetList(String strwhere,String strorder){
String sql="select * from Admin";
if(!(isInvalid(strwhere)))
{
sql+=" where "+strwhere;
}
if(!(isInvalid(strorder)))
{
sql+=" order by "+strorder;
}
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
List<AdminBean> list=new ArrayList<AdminBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
AdminBean cnbean=new AdminBean();
cnbean.setAdmin_ID(rs.getInt("Admin_ID"));
cnbean.setAdmin_Username(rs.getString("Admin_Username"));
cnbean.setAdmin_Password(rs.getString("Admin_Password"));
cnbean.setAdmin_Name(rs.getString("Admin_Name"));
cnbean.setAdmin_Sex(rs.getString("Admin_Sex"));
cnbean.setAdmin_Tel(rs.getString("Admin_Tel"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
//获取指定ID的实体Bean
public AdminBean GetBean(int id){
String sql="select * from Admin where Admin_ID="+id;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
AdminBean cnbean=new AdminBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
cnbean.setAdmin_ID(rs.getInt("Admin_ID"));
cnbean.setAdmin_Username(rs.getString("Admin_Username"));
cnbean.setAdmin_Password(rs.getString("Admin_Password"));
cnbean.setAdmin_Name(rs.getString("Admin_Name"));
cnbean.setAdmin_Sex(rs.getString("Admin_Sex"));
cnbean.setAdmin_Tel(rs.getString("Admin_Tel"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//添加
public void Add(AdminBean cnbean){
String sql="insert into Admin (";
sql+="Admin_Username,Admin_Password,Admin_Name,Admin_Sex,Admin_Tel";
sql+=") values(";
sql+="'"+cnbean.getAdmin_Username()+"','"+cnbean.getAdmin_Password()+"','"+cnbean.getAdmin_Name()+"','"+cnbean.getAdmin_Sex()+"','"+cnbean.getAdmin_Tel()+"'";
sql+=")";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//修改
public void Update(AdminBean cnbean){
String sql="update Admin set ";
sql+="Admin_Username='"+cnbean.getAdmin_Username()+"',";
sql+="Admin_Password='"+cnbean.getAdmin_Password()+"',";
sql+="Admin_Name='"+cnbean.getAdmin_Name()+"',";
sql+="Admin_Sex='"+cnbean.getAdmin_Sex()+"',";
sql+="Admin_Tel='"+cnbean.getAdmin_Tel()+"'";
sql+=" where Admin_ID='"+cnbean.getAdmin_ID()+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//删除
public void Delete(String strwhere){
String sql="delete Admin where ";
sql+=strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//判断是否空值
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
//测试
public static void main(String[] args) {
System.out.println("");
}
}

202
dao文件/RepairDao.java
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package com.dao;
import com.bean.Repair_addBean;
import com.db.DBHelper;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class RepairDao {
//获取列表
public List<Repair_addBean> GetList(String strwhere, String strorder){
String sql="select * from repair ";
if(!(isInvalid(strwhere)))
{
sql+=" where "+strwhere;
}
if(!(isInvalid(strorder)))
{
sql+=" order by "+strorder;
}
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
List<Repair_addBean> list=new ArrayList<Repair_addBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
Repair_addBean cnbean=new Repair_addBean();
// cnbean.setRepair_time((rs.getInt("Repair_time")));
cnbean.setRepair_id(rs.getInt("repair_id"));
cnbean.setRepair_info(rs.getString("repair_info"));
cnbean.setRepair_address(rs.getString("repair_address"));
//cnbean.setRepair_info(rs.getString("repair_info;"));
// cnbean.setRepair_cost(rs.getString("repair_cost"));
cnbean.setRepair_tel(rs.getString("repair_tel"));
cnbean.setRepair_status(rs.getString("repair_status"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
//获取指定ID的实体Bean
public Repair_addBean GetBean(int id){
String sql="select * from repair where repair_id="+id;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
Repair_addBean cnbean=new Repair_addBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
cnbean.setRepair_id(rs.getInt("repair_id"));
// cnbean.setRepair_info(rs.getString("repair_info"));
// cnbean.setRepair_address(rs.getString("repair_address"));
// cnbean.setRepair_tel(rs.getString("repair_tel"));
cnbean.setRepair_status(rs.getString("repair_status"));
// cnbean.setTeacher_Tel(rs.getString("Teacher_Tel"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//添加
public void Add(Repair_addBean cnbean){
Statement stat = null;
ResultSet rs = null;
String sql="insert into repair (";
sql+="repair_id,repair_info,repair_address,repair_tel";
sql+=") values(";
sql+="'"+cnbean.getRepair_id()+"','"+cnbean.getRepair_info()+"','"+cnbean.getRepair_address()+"','"+cnbean.getRepair_tel()+"'";
sql+=")";
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//修改
public void Update(Repair_addBean cnbean){
String sql="update repair set ";
// sql+="repair_id='"+cnbean.getRepair_id()+"',";
// sql+="repair_info='"+cnbean.getRepair_info()+"',";
//sql+="repair_address='"+cnbean.getRepair_address()+"',";
// sql+="repair_tel='"+cnbean.getRepair_tel()+"',";
sql+="repair_status='"+cnbean.getRepair_status()+"'";
sql+=" where repair_id='"+cnbean.getRepair_id()+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
System.out.println(sql);
System.out.println("修改状态成功");
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//删除
public void Delete(String strwhere){
String sql="delete repair where ";
sql+=strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//判断是否空值
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
//测试
public static void main(String[] args) {
System.out.println("");
}
}

462
dao文件/StudentDao.java
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package com.dao;
import com.bean.StudentBean;
import com.db.DBHelper;
import org.apache.struts2.ServletActionContext;
import javax.servlet.http.HttpSession;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class StudentDao {
//验证登录
public String CheckLogin(String username, String password){
String id = null;
String sql="select * from Student where Student_Username='"+username+"' and Student_Password='"+password+"' or Student_State='入住'";
Statement stat = null;
ResultSet rs = null;
System.out.println(sql);
Connection conn = new DBHelper().getConn();
System.out.println(conn);
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
id = rs.getString("Student_ID");
}
}
catch(SQLException ex){
System.out.println(ex);
}
return id;
}
//验证密码
public boolean CheckPassword(String id, String password){
boolean ps = false;
String sql="select * from Student where Student_ID='"+id+"' and Student_Password='"+password+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
ps=true;
}
}
catch(SQLException ex){}
return ps;
}
//获取所有列表
public List<StudentBean> GetAllList(String strwhere,String strorder){
String sql="select *from Student";
// String sql1="select count(*) from Student";
if(!(isInvalid(strwhere)))
{
sql+=" where "+strwhere;
}
if(!(isInvalid(strorder)))
{
sql+=" order by "+strorder;
}
System.out.println(sql);
Statement stat = null;
ResultSet rs = null;
// String count="";
Connection conn = new DBHelper().getConn();
List<StudentBean> list=new ArrayList<StudentBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
// count= String.valueOf(stat.executeQuery(sql1));
// System.out.println(count);
HttpSession session = ServletActionContext.getRequest().getSession();
// session.setAttribute("number", count);
while(rs.next()){
StudentBean cnbean=new StudentBean();
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
public List<StudentBean> GetAllList1(int a){
System.out.println(a);
a=a*16;
int b=16;
System.out.println("a"+a);
System.out.println("b"+b);
String sql="select *from Student LIMIT ";
sql+=a+","+b;
String sql1="select count(*) from Student";
System.out.println(sql);
Statement stat = null;
ResultSet rs = null;
String count="";
Connection conn = new DBHelper().getConn();
List<StudentBean> list=new ArrayList<StudentBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
// count= String.valueOf(stat.executeQuery(sql1));
System.out.println(count);
// HttpSession session = ServletActionContext.getRequest().getSession();
//// session.setAttribute("number", count);
while(rs.next()){
StudentBean cnbean=new StudentBean();
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
//获取列表
public List<StudentBean> GetList(String strwhere,String strorder){
String sql="select * from Student,Domitory,Building where Student_DomitoryID=Domitory_ID and Domitory_BuildingID=Building_ID";
if(!(isInvalid(strwhere)))
{
sql+=" and "+strwhere;
}
if(!(isInvalid(strorder)))
{
sql+=" order by "+strorder;
}
// System.out.println(sql);
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
List<StudentBean> list=new ArrayList<StudentBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
StudentBean cnbean=new StudentBean();
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
cnbean.setDomitory_Name(rs.getString("Domitory_Name"));
cnbean.setBuilding_Name(rs.getString("Building_Name"));
cnbean.setDomitory_Type(rs.getString("Domitory_Type"));
cnbean.setDomitory_Number(rs.getString("Domitory_Number"));
cnbean.setDomitory_Tel(rs.getString("Domitory_Tel"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
//获取指定ID的实体Bean
public StudentBean GetAllFirstBean(String strwhere){
String sql="select * from Student where "+strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
StudentBean cnbean=new StudentBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
if(rs.next()){
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//获取指定ID的实体Bean
public StudentBean GetFirstBean(String strwhere){
String sql="select * from Student,Domitory,Building where Student_DomitoryID=Domitory_ID and Domitory_BuildingID=Building_ID and "+strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
StudentBean cnbean=new StudentBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
if(rs.next()){
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
cnbean.setDomitory_Name(rs.getString("Domitory_Name"));
cnbean.setDomitory_Number(rs.getString("Domitory_Number"));
cnbean.setBuilding_Name(rs.getString("Building_Name"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//获取指定ID的实体Bean
public StudentBean GetAllBean(int id){
String sql="select * from Student where Student_ID="+id;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
StudentBean cnbean=new StudentBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//获取指定ID的实体Bean
public StudentBean GetBean(int id){
String sql="select * from Student,Domitory,Building where Student_DomitoryID=Student_DomitoryID and where Building_ID=Building and where Student_ID="+id;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
StudentBean cnbean=new StudentBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
cnbean.setStudent_ID(rs.getInt("Student_ID"));
cnbean.setStudent_DomitoryID(rs.getInt("Student_DomitoryID"));
cnbean.setStudent_Username(rs.getString("Student_Username"));
cnbean.setStudent_Password(rs.getString("Student_Password"));
cnbean.setStudent_Name(rs.getString("Student_Name"));
cnbean.setStudent_Sex(rs.getString("Student_Sex"));
cnbean.setStudent_Class(rs.getString("Student_Class"));
cnbean.setStudent_State(rs.getString("Student_State"));
cnbean.setDomitory_Name(rs.getString("Domitory_Name"));
cnbean.setBuilding_Name(rs.getString("Building_Name"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//添加
public void Add(StudentBean cnbean){
String sql="insert into Student (";
sql+="Student_DomitoryID,Student_Username,Student_Password,Student_Name,Student_Sex,Student_Class,Student_State";
sql+=") values(";
sql+="'"+cnbean.getStudent_DomitoryID()+"','"+cnbean.getStudent_Username()+"','"+cnbean.getStudent_Password()+"','"+cnbean.getStudent_Name()+"','"+cnbean.getStudent_Sex()+"','"+cnbean.getStudent_Class()+"','"+cnbean.getStudent_State()+"'";
sql+=")";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//修改
public void Update(StudentBean cnbean){
String sql="update Student set ";
sql+="Student_DomitoryID='"+cnbean.getStudent_DomitoryID()+"',";
sql+="Student_Username='"+cnbean.getStudent_Username()+"',";
sql+="Student_Password='"+cnbean.getStudent_Password()+"',";
sql+="Student_Name='"+cnbean.getStudent_Name()+"',";
sql+="Student_Sex='"+cnbean.getStudent_Sex()+"',";
sql+="Student_Class='"+cnbean.getStudent_Class()+"',";
sql+="Student_State='"+cnbean.getStudent_State()+"'";
sql+=" where Student_ID='"+cnbean.getStudent_ID()+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//删除
public void Delete(int id){
String sql="delete from student where Student_ID="+id;
//sql+=strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//判断是否空值
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
//测试
public static void main(String[] args) {
System.out.println("");
}
}

231
dao文件/TeacherDao.java
Unescape View File

@ -0,0 +1,231 @@
package com.dao;
import com.db.DBHelper;
import com.bean.TeacherBean;
import java.util.*;
import java.sql.*;
public class TeacherDao {
//验证登录
public String CheckLogin(String username, String password){
System.out.println("user"+username+"password"+password);
String id = null;
String sql="select * from Teacher where Teacher_Username='"+username+"' and Teacher_Password='"+password+"'";
System.out.println(sql);
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
System.out.println(conn);
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
id = rs.getString("Teacher_ID");
}
}
catch(SQLException ex){
System.out.println(ex);
}
return id;
}
//验证密码
public boolean CheckPassword(String id, String password){
boolean ps = false;
String sql="select * from Teacher where Teacher_ID='"+id+"' and Teacher_Password='"+password+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while (rs.next()) {
ps=true;
}
}
catch(SQLException ex){}
return ps;
}
//获取列表
public List<TeacherBean> GetList(String strwhere,String strorder){
String sql="select * from Teacher";
if(!(isInvalid(strwhere)))
{
sql+=" where "+strwhere;
}
if(!(isInvalid(strorder)))
{
sql+=" order by "+strorder;
}
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
List<TeacherBean> list=new ArrayList<TeacherBean>();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
TeacherBean cnbean=new TeacherBean();
cnbean.setTeacher_ID(rs.getInt("Teacher_ID"));
cnbean.setTeacher_Username(rs.getString("Teacher_Username"));
cnbean.setTeacher_Password(rs.getString("Teacher_Password"));
cnbean.setTeacher_Name(rs.getString("Teacher_Name"));
cnbean.setTeacher_Sex(rs.getString("Teacher_Sex"));
cnbean.setTeacher_Tel(rs.getString("Teacher_Tel"));
list.add(cnbean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return list;
}
//获取指定ID的实体Bean
public TeacherBean GetBean(int id){
String sql="select * from Teacher where Teacher_ID="+id;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
TeacherBean cnbean=new TeacherBean();
try{
stat = conn.createStatement();
rs = stat.executeQuery(sql);
while(rs.next()){
cnbean.setTeacher_ID(rs.getInt("Teacher_ID"));
cnbean.setTeacher_Username(rs.getString("Teacher_Username"));
cnbean.setTeacher_Password(rs.getString("Teacher_Password"));
cnbean.setTeacher_Name(rs.getString("Teacher_Name"));
cnbean.setTeacher_Sex(rs.getString("Teacher_Sex"));
cnbean.setTeacher_Tel(rs.getString("Teacher_Tel"));
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return cnbean;
}
//添加
public void Add(TeacherBean cnbean){
String sql="insert into Teacher (";
sql+="Teacher_Username,Teacher_Password,Teacher_Name,Teacher_Sex,Teacher_Tel";
sql+=") values(";
sql+="'"+cnbean.getTeacher_Username()+"','"+cnbean.getTeacher_Password()+"','"+cnbean.getTeacher_Name()+"','"+cnbean.getTeacher_Sex()+"','"+cnbean.getTeacher_Tel()+"'";
sql+=")";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//修改
public void Update(TeacherBean cnbean){
String sql="update Teacher set ";
sql+="Teacher_Username='"+cnbean.getTeacher_Username()+"',";
sql+="Teacher_Password='"+cnbean.getTeacher_Password()+"',";
sql+="Teacher_Name='"+cnbean.getTeacher_Name()+"',";
sql+="Teacher_Sex='"+cnbean.getTeacher_Sex()+"',";
sql+="Teacher_Tel='"+cnbean.getTeacher_Tel()+"'";
sql+=" where Teacher_ID='"+cnbean.getTeacher_ID()+"'";
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
System.out.println(sql);
System.out.println("修改状态成功");
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//删除
public void Delete(int id){
String sql="delete from teacher where Teacher_ID="+id;
//sql+=strwhere;
Statement stat = null;
ResultSet rs = null;
Connection conn = new DBHelper().getConn();
try{
stat = conn.createStatement();
stat.executeUpdate(sql);
} catch (SQLException e) {
e.printStackTrace();
} finally {
try {
if (conn != null)
conn.close();
if (stat != null)
stat.close();
if (rs != null)
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
//判断是否空值
private boolean isInvalid(String value) {
return (value == null || value.length() == 0);
}
//测试
public static void main(String[] args) {
System.out.println("");
}
}
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