android_SQLite.rar_android_android sql

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); 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); 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; 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.i("haiyang:sql2=", 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(); setTitle(Integer.toString(num) + " 条记录"); } }