[android]代码库(1)Dao类

package org.gdufs.dao;

import java.sql.*;

import java.util.ArrayList;

import java.util.List;

import org.gdufs.entity.Student;

import org.gdufs.util.DBHelper;

import org.gdufs.util.DBHelper2;

public class StudentDao {

public Student findStudentById(String studentId) {

Student student = null;

Connection con = null;

PreparedStatement stat = null;

con = DBHelper2.connect();

String sql1 = "select * from student where studentId=?";// and password=?";

try {

stat = con.prepareStatement(sql1);

stat.setString(1, studentId);

ResultSet rs = stat.executeQuery();

if (rs.next()) {

student = new Student();

student.setStudentId(studentId);

student.setStudentName(rs.getString("studentName"));

student.setPassword(rs.getString("password"));

student.setClassName(rs.getString("className"));

student.setEmail(rs.getString("email"));

student.setPhoto(rs.getString("photo"));

student.setTelephone(rs.getString("telephone"));

student.setSex(rs.getString("sex"));

student.setSchool(rs.getString("school"));

}

} catch (SQLException ex) {

System.out.println("dao异常"+ex.toString());

} finally {

DBHelper2.closePreparedStatement(stat);

DBHelper2.closeConneciton(con);

}

return student;

}

public List getStudents() {

List students = new ArrayList();

Student student = null;

Connection con = null;

PreparedStatement stat = null;

con = DBHelper2.connect();

String sql1 = "select * from student ";// and password=?";

try {

stat = con.prepareStatement(sql1);

ResultSet rs = stat.executeQuery();

while (rs.next()) {

student = new Student();

student.setStudentId(rs.getString("studentId"));

student.setStudentName(rs.getString("studentName"));

student.setPassword(rs.getString("password"));

student.setClassName(rs.getString("className"));

student.setEmail(rs.getString("email"));

student.setPhoto(rs.getString("photo"));

student.setTelephone(rs.getString("telephone"));

student.setSex(rs.getString("sex"));

student.setSchool(rs.getString("school"));

students.add(student);

}

} catch (SQLException ex) {

System.out.println("dao异常" + ex.toString());

} finally {

DBHelper2.closePreparedStatement(stat);

DBHelper2.closeConneciton(con);

}

return students;

}

}

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