标签：JAVAWEB 选课 系统 resultSet student sql import public String
按照网上的教程和素材制作，第一部分信息管理
源码
ackage com.ischoolbar.programmer.dao;
import java.sql.ResultSet;
import java.sql.SQLException;
import com.ischoolbar.programmer.model.Admin;
import com.ischoolbar.programmer.model.Clazz;
/**
*
* @author llq
*管理员数据库操作封装
*/
public class AdminDao extends BaseDao {
public Admin login(String name ,String password){
String sql = "select * from s_admin where name = '" + name + "' and password = '" + password + "'";
ResultSet resultSet = query(sql);
try {
if(resultSet.next()){
Admin admin = new Admin();
admin.setId(resultSet.getInt("id"));
admin.setName(resultSet.getString("name"));
admin.setPassword(resultSet.getString("password"));
admin.setStatus(resultSet.getInt("status"));
return admin;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
public boolean editPassword(Admin admin,String newPassword) {
// TODO Auto-generated method stub
String sql = "update s_admin set password = '"+newPassword+"' where id = " + admin.getId();
return update(sql);
}
}
package com.ischoolbar.programmer.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.ischoolbar.programmer.util.DbUtil;
/**
*
* @author llq
*基础dao，封装基本操作
*/
public class BaseDao {
private DbUtil dbUtil = new DbUtil();
/**
* 关闭数据库连接，释放资源
*/
public void closeCon(){
dbUtil.closeCon();
}
/**
* 基础查询,多条查询
*/
public ResultSet query(String sql){
try {
PreparedStatement prepareStatement = dbUtil.getConnection().prepareStatement(sql);
return prepareStatement.executeQuery();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
/**
*改变数据库内容操作
*/
public boolean update(String sql){
try {
return dbUtil.getConnection().prepareStatement(sql).executeUpdate() > 0;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return false;
}
public Connection getConnection(){
return dbUtil.getConnection();
}
}
package com.ischoolbar.programmer.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.ischoolbar.programmer.model.Admin;
import com.ischoolbar.programmer.model.Clazz;
import com.ischoolbar.programmer.model.Page;
import com.ischoolbar.programmer.model.Student;
import com.ischoolbar.programmer.util.StringUtil;
public class StudentDao extends BaseDao {
public boolean addStudent(Student student){
String sql = "insert into s_student values(null,'"+student.getSn()+"','"+student.getName()+"'";
sql += ",'" + student.getPassword() + "'," + student.getClazzId();
sql += ",'" + student.getSex() + "','" + student.getMobile() + "'";
sql += ",'" + student.getQq() + "',null)";
return update(sql);
}
public boolean editStudent(Student student) {
// TODO Auto-generated method stub
String sql = "update s_student set name = '"+student.getName()+"'";
sql += ",sex = '" + student.getSex() + "'";
sql += ",mobile = '" + student.getMobile() + "'";
sql += ",qq = '" + student.getQq() + "'";
sql += ",clazz_id = " + student.getClazzId();
sql += " where id = " + student.getId();
return update(sql);
}
public boolean setStudentPhoto(Student student) {
// TODO Auto-generated method stub
String sql = "update s_student set photo = ? where id = ?";
Connection connection = getConnection();
try {
PreparedStatement prepareStatement = connection.prepareStatement(sql);
prepareStatement.setBinaryStream(1, student.getPhoto());
prepareStatement.setInt(2, student.getId());
return prepareStatement.executeUpdate() > 0;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return update(sql);
}
public boolean deleteStudent(String ids) {
// TODO Auto-generated method stub
String sql = "delete from s_student where id in("+ids+")";
return update(sql);
}
public Student getStudent(int id){
String sql = "select * from s_student where id = " + id;
Student student = null;
ResultSet resultSet = query(sql);
try {
if(resultSet.next()){
student = new Student();
student.setId(resultSet.getInt("id"));
student.setClazzId(resultSet.getInt("clazz_id"));
student.setMobile(resultSet.getString("mobile"));
student.setName(resultSet.getString("name"));
student.setPassword(resultSet.getString("password"));
student.setPhoto(resultSet.getBinaryStream("photo"));
student.setQq(resultSet.getString("qq"));
student.setSex(resultSet.getString("sex"));
student.setSn(resultSet.getString("sn"));
return student;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return student;
}
public List<Student> getStudentList(Student student,Page page){
List<Student> ret = new ArrayList<Student>();
String sql = "select * from s_student ";
if(!StringUtil.isEmpty(student.getName())){
sql += "and name like '%" + student.getName() + "%'";
}
if(student.getClazzId() != 0){
sql += " and clazz_id = " + student.getClazzId();
}
if(student.getId() != 0){
sql += " and id = " + student.getId();
}
sql += " limit " + page.getStart() + "," + page.getPageSize();
ResultSet resultSet = query(sql.replaceFirst("and", "where"));
try {
while(resultSet.next()){
Student s = new Student();
s.setId(resultSet.getInt("id"));
s.setClazzId(resultSet.getInt("clazz_id"));
s.setMobile(resultSet.getString("mobile"));
s.setName(resultSet.getString("name"));
s.setPassword(resultSet.getString("password"));
s.setPhoto(resultSet.getBinaryStream("photo"));
s.setQq(resultSet.getString("qq"));
s.setSex(resultSet.getString("sex"));
s.setSn(resultSet.getString("sn"));
ret.add(s);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return ret;
}
public int getStudentListTotal(Student student){
int total = 0;
String sql = "select count(*)as total from s_student ";
if(!StringUtil.isEmpty(student.getName())){
sql += "and name like '%" + student.getName() + "%'";
}
if(student.getClazzId() != 0){
sql += " and clazz_id = " + student.getClazzId();
}
if(student.getId() != 0){
sql += " and id = " + student.getId();
}
ResultSet resultSet = query(sql.replaceFirst("and", "where"));
try {
while(resultSet.next()){
total = resultSet.getInt("total");
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return total;
}
package com.ischoolbar.programmer.util;
import java.sql.Connection;
import java.sql.Driver;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.management.loading.PrivateClassLoader;
/**
*
* @author llq
*数据库连util
*/
public class DbUtil {
private String dbUrl = "jdbc:mysql://localhost:3306/db_student_manager_web?useUnicode=true&characterEncoding=utf8";
private String dbUser = "root";
private String dbPassword = "";
private String jdbcName = "com.mysql.jdbc.Driver";
private Connection connection = null;
public Connection getConnection(){
try {
Class.forName(jdbcName);
connection = DriverManager.getConnection(dbUrl, dbUser, dbPassword);
System.out.println("数据库链接成功！");
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("数据库链接失败！");
e.printStackTrace();
}
return connection;
}
public void closeCon(){
if(connection != null)
try {
connection.close();
System.out.println("数据库链接已关闭！");
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
DbUtil dbUtil = new DbUtil();
dbUtil.getConnection();
}
}
标签：JAVAWEB,选课,系统,resultSet,student,sql,import,public,String 来源： https://www.cnblogs.com/ICDTAD/p/12152648.html
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