package com.szy.sqlite.dao;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import com.szy.sqlite.model.Student;
/**
* @author coolszy
* @blog http://blog.csdn.net/coolszy
*/
public class StudentDAO
{
private DBOpenHelper helper;
private SQLiteDatabase db;
public StudentDAO(Context context)
{
helper = new DBOpenHelper(context);
}
/**
* 添加新的学生信息
*
* @param student
*/
public void add(Student student)
{
db = helper.getWritableDatabase();
db.execSQL("insert into t_student (sid,name,age) values (?,?,?)", new Object[]
{ student.getSid(), student.getName(), student.getAge() });
}
/**
* 更新学生信息
*
* @param student
*/
public void update(Student student)
{
db = helper.getWritableDatabase();
db.execSQL("update t_student set name = ?,age = ? where sid = ?", new Object[]
{ student.getName(), student.getAge(), student.getSid() });
}
/**
* 查找学生信息
*
* @param sid
* @return
*/
public Student find(int sid)
{
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select sid,name,age from t_student where sid = ?", new String[]
{ String.valueOf(sid) });
if (cursor.moveToNext())
{
return new Student(cursor.getInt(cursor.getColumnIndex("sid")), cursor.getString(cursor.getColumnIndex("name")), cursor.getShort(cursor.getColumnIndex("age")));
}
return null;
}
/**
* 刪除学生信息
*
* @param sids
*/
public void detele(Integer... sids)
{
if (sids.length > 0)
{
StringBuffer sb = new StringBuffer();
for (int i = 0; i < sids.length; i++)
{
sb.append('?').append(',');
}
sb.deleteCharAt(sb.length() - 1);
SQLiteDatabase database = helper.getWritableDatabase();
database.execSQL("delete from t_student where sid in (" + sb + ")", (Object[]) sids);
}
}
/**
* 获取学生信息
* @param start 其实位置
* @param count 学生数量
* @return
*/
public List<Student> getScrollData(int start, int count)
{
List<Student> students = new ArrayList<Student>();
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select * from t_student limit ?,?", new String[]{ String.valueOf(start), String.valueOf(count) });
while (cursor.moveToNext())
{
students.add(new Student(cursor.getInt(cursor.getColumnIndex("sid")), cursor.getString(cursor.getColumnIndex("name")), cursor.getShort(cursor.getColumnIndex("age"))));
}
return students;
}
/**
* 获取学生数量
* @return
*/
public long getCount()
{
db = helper.getWritableDatabase();
Cursor cursor = db.rawQuery("select count(sid) from t_student", null);
if (cursor.moveToNext())
{
return cursor.getLong(0);
}
return 0;
}
}
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