SQLite基本操作加数据库分页查询

    

先进行简单的数据操作.然后在数据库上面做分页查询的操作,也就是listview分页.看代码

MySQLiteOpenHelper类,继承SQLiteOpenHelper类,是android中操作数据库的辅助类

package zuoyeSQLlite.hall;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class MySQLiteOpenHelper extends SQLiteOpenHelper {
     private static final int dataversion=1;
     private  String TableName="";
     /**
      * context当前的上下问,DataName数据库名称
      *factory游标工厂,version数据库版本,TableName 要创建的表名
      */
  public MySQLiteOpenHelper(Context context, String DataName,
   CursorFactory factory, int version,String TableName)
  {
  super(context, DataName, factory, version);
  this.TableName=TableName;
  }
 public MySQLiteOpenHelper(Context context,String DataName,int version,String TableName)
 {
   this(context, DataName, null, version,TableName);
  // TODO Auto-generated constructor stub
 }
 public MySQLiteOpenHelper(Context context,String DataName,String TableName)
 {
   this(context, DataName, dataversion,TableName);
  // TODO Auto-generated constructor stub
 }

//onCreate方法只有在数据库被创建的时候触发
 @Override
 public void onCreate(SQLiteDatabase db) {
  // TODO Auto-generated method stub
  String sql="create table "+TableName+"(_id integer primary key,id text,name text,age text);";
  db.execSQL(sql);
  System.out.println("数据库被创建");
 }

//数据库被打开的时候触发
 @Override
 public void onOpen(SQLiteDatabase db) {
  // TODO Auto-generated method stub 
  super.onOpen(db);
  System.out.println("数据库被打开");
 }

 //数据库本版更新的时候触发

 @Override
 public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
  // TODO Auto-generated method stub
  System.out.println("数据库被更新");
 }

zuoyeSQLlite 类,是一个activity类

        //注意.当助手类被new出来的时候,并不会触发其oncreat或者onopen方法,
        //只有当取得数据库对象的时候才会触发oncreat或者onopen方法
        //如mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
        //如果数据库存在,则打开数据库触发onopen(),如果数据库不存在,则创建数据库,触发onCreate()

   // 数据库操作中几个参数的意思:distinct="如果多个相同值,只去一个", table="表命", columns="要查询的列名",

selection="查询 条件",
      //    selectionArgs="条件中用了占位符的参数", groupBy="数据分组", having="分组后的条件",

orderBy="排序方式", limit="分页查询");

具体请看代码:

package zuoyeSQLlite.hall;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

public class zuoyeSQLlite extends Activity {
 private TextView text_pageNo;//显示页码的textview
 private Button button_next, button_last;
 private ListView listview = null;
 private ListAdapter adapter;
 private MySQLiteOpenHelper mMySQLiteOpenHelper=null;//助手类
 private SQLiteDatabase mSqLiteDatabase=null;//数据库对象
 private EditText edit_id,edit_name,edit_age;
 private Button button_add,button_update,button_delete,button_query;
 private String text_id="",text_name="",text_age="";
 private int limit=5;//显示5行数据
 private int pageNo=1;//页码
 private int pageCount=0;//页面总数
 private boolean isfirst=false;
 public static final  String TableName="userinfo1";
 public static final String DataName="myData";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mMySQLiteOpenHelper =new MySQLiteOpenHelper(this, DataName, TableName);
        findView();// 获得控件对象
        isfirst=true;
    }
    //获取每个控件
    private void findView(){
     edit_id=(EditText)findViewById(R.id.edit_id);
     edit_age=(EditText)findViewById(R.id.edit_age);
     edit_name=(EditText)findViewById(R.id.edit_name);
     button_add=(Button)findViewById(R.id.button_add);
     button_add.setOnClickListener(new MyButtonListener());
     button_delete=(Button)findViewById(R.id.button_delete);
     button_delete.setOnClickListener(new MyButtonListener());
     button_update=(Button)findViewById(R.id.button_update);
     button_update.setOnClickListener(new MyButtonListener());
     button_query=(Button)findViewById(R.id.button_query);
     button_query.setOnClickListener(new MyButtonListener());
  button_last = (Button) findViewById(R.id.button_last);
  button_last.setOnClickListener(new MyButtonListener());
  button_next = (Button) findViewById(R.id.button_next);
  button_next.setOnClickListener(new MyButtonListener());
  listview = (ListView) findViewById(android.R.id.list);
  text_pageNo=(TextView)findViewById(R.id.text_page);
    }
    //button的监听类
    class MyButtonListener implements android.view.View.OnClickListener{

  @Override
  public void onClick(View v) {
   // TODO Auto-generated method stub
   switch(v.getId()){
   case R.id.button_add:
    insert();
    break;
   case R.id.button_delete:
    delete();
    break;
   case R.id.button_update:
    update();
    break;
   case R.id.button_query:
    query(pageNo);
    break;
           case R.id.button_next:
            pageNo++;
            if(pageNo>pageCount){
             pageNo=1;
            }
            query(pageNo);
            break;
           case R.id.button_last:
            pageNo--;
            if(pageNo<1){
             pageNo=pageCount;
            }
            query(pageNo);
            break;
   }
  }
  
    }
    //设置显示的页码
    private void setpageNo(int pageNo){
     String text=null;
     text=pageNo+"/"+pageCount;
     text_pageNo.setText(text);
    }
    //删除数据
    private void delete(){
     text_id=edit_id.getText().toString().trim();
     String sql="id="+text_id;
     try{
      mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
      mSqLiteDatabase.delete(TableName, sql, null);
     }catch(Exception e){
   e.getMessage();
   System.out.println("修改出错");
  }
    }
    //修改数据
    private void update(){
     text_id=edit_id.getText().toString().trim();
     text_age=edit_age.getText().toString().trim();
     text_name=edit_name.getText().toString().trim();
     String where="id="+text_id;
        ContentValues values=new ContentValues();
        values.put("id", text_id);
        values.put("age", text_age);
        values.put("name", text_name);
     try{
      mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
      mSqLiteDatabase.update(TableName, values, where, null);
     }catch(Exception e){
   e.getMessage();
   System.out.println("修改出错");
  }
    }
    //添加数据
    private void insert(){
     text_id=edit_id.getText().toString().trim();
     text_age=edit_age.getText().toString().trim();
     text_name=edit_name.getText().toString().trim();
     mSqLiteDatabase=mMySQLiteOpenHelper.getWritableDatabase();
        ContentValues values=new ContentValues();
        values.put("id", text_id);
        values.put("age", text_age);
        values.put("name", text_name);
        try{
     mSqLiteDatabase.insert(TableName, null, values);
        }catch(Exception e){
   e.getMessage();
   System.out.println("插入出错");
  }      
   
    }
    private void setAdapter(Cursor cur){
        /*Cursor cur=null;
        cur=getDate();*/
        if(cur!=null){
        adapter=new SimpleCursorAdapter(zuoyeSQLlite.this, R.layout.user, cur,
          new String[]{"_id","id","name","age"}, new int[]{R.id._id,R.id.userid,R.id.username,R.id.userage});
        listview.setAdapter(adapter);
        }
 }
    //查询数据
    private void query(int pageNo){
     mSqLiteDatabase=mMySQLiteOpenHelper.getReadableDatabase();
     Cursor cursor=null;
     if(isfirst){
      cursor= mSqLiteDatabase.query(TableName, null, null,
       null,null, null, null, null);
      pageCount=cursor.getCount()/limit+1;
      isfirst=false;
     }
      cursor= mSqLiteDatabase.query(TableName, null, null,
            null,null, null, null, limit*(pageNo-1)+","+limit);//"5,9",标志从第下标为5的行开始,返回9行数据
       System.out.println(limit*(pageNo-1)+"--=--"+limit*pageNo);
     s
     setpageNo(pageNo);
     setAdapter(cursor);
  
    }
}