android SQLite查询

1.package com.eoeAndroid.SQLite;   

import android.app.Activity;   
import android.content.Context;   
import android.database.Cursor;   
import android.database.SQLException;   
import android.database.sqlite.SQLiteDatabase;   
import android.database.sqlite.SQLiteOpenHelper;   
import android.os.Bundle;   
import android.util.Log;   
import android.view.View;   
import android.view.View.OnClickListener;   
import android.widget.Button;   

public class ActivityMain extends Activity {   
   OnClickListener listener1 = null;   
   OnClickListener listener2 = null;   
   OnClickListener listener3 = null;   
   OnClickListener listener4 = null;   
   OnClickListener listener5 = null;   

   Button button1;   
   Button button2;   
   Button button3;   
   Button button4;   
   Button button5;   

   DatabaseHelper mOpenHelper;   

   private static final String DATABASE_NAME = "dbForTest.db";   
   private static final int DATABASE_VERSION = 1;   
   private static final String TABLE_NAME = "diary";   
   private static final String TITLE = "title";   
   private static final String BODY = "body";   

   private static class DatabaseHelper extends SQLiteOpenHelper {   
       DatabaseHelper(Context context) {   
           super(context, DATABASE_NAME, null, DATABASE_VERSION);   
       }   

       @Override  
       public void onCreate(SQLiteDatabase db) {   

           String sql = "CREATE TABLE " + TABLE_NAME + " (" + TITLE   
                   + " text not null, " + BODY + " text not null " + ");";   
           Log.i("haiyang:createDB=", sql);   
           Log.v("lunzi", sql);   
           db.execSQL(sql);   

       }   

       @Override  
       public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {   
       }   
   }   

   @Override  
   public void onCreate(Bundle savedInstanceState) {   
       super.onCreate(savedInstanceState);   
       setContentView(R.layout.main);   
       prepareListener();   
       initLayout();   
       mOpenHelper = new DatabaseHelper(this);   

   }   

   private void initLayout() {   
       button1 = (Button) findViewById(R.id.button1);   
       button1.setOnClickListener(listener1);   

       button2 = (Button) findViewById(R.id.button2);   
       button2.setOnClickListener(listener2);   

       button3 = (Button) findViewById(R.id.button3);   
       button3.setOnClickListener(listener3);   
       button4 = (Button) findViewById(R.id.button4);   
       button4.setOnClickListener(listener4);   

       button5 = (Button) findViewById(R.id.button5);   
       button5.setOnClickListener(listener5);   

   }   

   private void prepareListener() {   
       listener1 = new OnClickListener() {   
           public void onClick(View v) {   
               CreateTable();   
           }   
       };   
       listener2 = new OnClickListener() {   
           public void onClick(View v) {   
               dropTable();   
           }   
       };   
       listener3 = new OnClickListener() {   
           public void onClick(View v) {   
               insertItem();   
           }   
       };   
        listener4 = new OnClickListener() {   
            public void onClick(View v) {   
                deleteItem();   
            }   
        };   
        listener5 = new OnClickListener() {   
            public void onClick(View v) {   
                showItems();   
            }   
        };   
    }   

    /*  
     * 重新建立数据表  
     */  
    private void CreateTable() {   
        SQLiteDatabase db = mOpenHelper.getWritableDatabase();   
        String sql = "CREATE TABLE " + TABLE_NAME + " (" + TITLE   
                + " text not null, " + BODY + " text not null " + ");";   
        Log.i("haiyang:createDB=", sql);   
        Log.v("lunzi", sql);   
        try {   
            db.execSQL("DROP TABLE IF EXISTS diary");   
            db.execSQL(sql);   
            setTitle("数据表成功重建");   
        } catch (SQLException e) {   
            setTitle("数据表重建错误");   
        }   
    }   

    /*  
     * 删除数据表  
     */  
    private void dropTable() {   
        SQLiteDatabase db = mOpenHelper.getWritableDatabase();   
        String sql = "drop table " + TABLE_NAME;   
        Log.v("lunzi", sql);   
        try {   
            db.execSQL(sql);   
            setTitle("数据表成功删除：" + sql);   
        } catch (SQLException e) {   
            setTitle("数据表删除错误");   
        }   
    }   

    /*  
     * 插入两条数据  
     */  
    private void insertItem() {   
        SQLiteDatabase db = mOpenHelper.getWritableDatabase();   
        String sql1 = "insert into " + TABLE_NAME + " (" + TITLE + ", " + BODY   
                + ") values('haiyang', 'android的发展真是迅速啊');";   
        String sql2 = "insert into " + TABLE_NAME + " (" + TITLE + ", " + BODY   
                + ") values('icesky', 'android的发展真是迅速啊');";   
        try {   
            Log.i("haiyang:sql1=", sql1);   
            Log.v("lunzi", sql1);   
            Log.i("haiyang:sql2=", sql2);   
            Log.v("lunzi", sql2);   

            db.execSQL(sql1);   
            db.execSQL(sql2);   
            setTitle("插入两条数据成功");   
        } catch (SQLException e) {   
            setTitle("插入两条数据失败");   
        }   
    }   

    /*  
     * 删除其中的一条数据  
     */  
    private void deleteItem() {   
        try {   
            SQLiteDatabase db = mOpenHelper.getWritableDatabase();   
            db.delete(TABLE_NAME, " title = 'haiyang'", null);   
            setTitle("删除title为haiyang的一条记录");   
        } catch (SQLException e) {   

        }   

    }   

    /*  
     * 在屏幕的title区域显示当前数据表当中的数据的条数。  
     */  
    private void showItems() {   

        SQLiteDatabase db = mOpenHelper.getReadableDatabase();   
        String col[] = { TITLE, BODY };   
        Cursor cur = db.query(TABLE_NAME, col, null, null, null, null, null);   
        Integer num = cur.getCount();   
        cur.moveToFirst();   
        while (!cur.isAfterLast()) {   
            Log.v("lunzi", "cols:"+cur.getString(0)+"-"+cur.getString(1));   
            System.out.println("cols:"+cur.getString(0)+"-"+cur.getString(1));   
            cur.moveToNext();   
        }   
        db.close();   
        /*for (int i=0;i<num;i++) {  
            Log.v("lunzi", cur.getString(i));  
        }*/  
        setTitle(Integer.toString(num) + " 条记录");   
    }   

}