1,創建SqLitDBHelper類，繼承android.database.sqlite.SQLiteOpenHelper，重載onCreate()
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package tools;import android.content.Context;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteDatabase.CursorFactory;import android.database.sqlite.SQLiteOpenHelper;public class SqLitDBHelper extends SQLiteOpenHelper { public SqLitDBHelper(Context context, String name, CursorFactory factory, int version) { super(context, name, factory, version); // TODO Auto-generated constructor stub } @Override public void onCreate(SQLiteDatabase arg0) {//Called when the database is created for the first time // TODO Auto-generated method stub arg0.execSQL("create table userinfo(userId long,userName varchar(25))"); } @Override public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) { // TODO Auto-generated method stub }} |
2,對數據庫進行操作，
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package test.activity.sqlite;import tools.BackgroundMusicPlay;import tools.SqLitDBHelper;import android.app.Activity;import android.content.ContentValues;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.Toast;import com.sl.androidgametest.R;public class MySqliteTest extends Activity implements OnClickListener { private Button btn_sqlCreat;// 創建數據庫 private Button btn_sqlInsert;// 插入數據 private Button btn_sqlUpdate;// 更新數據 private Button btn_sqlQuerry;// 查詢數據 SqLitDBHelper dbh;//聲明SqLitDBHelper @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_next); //創建數據庫：tsetDb1 dbh= new SqLitDBHelper(MySqliteTest.this, "tsetDb1",null, 1); btn_sqlCreat = (Button) findViewById(R.id.sqlCreate); btn_sqlInsert = (Button) findViewById(R.id.sqlInsert); btn_sqlUpdate = (Button) findViewById(R.id.sqlUpdate); btn_sqlQuerry = (Button) findViewById(R.id.sqlQuerry); btn_sqlCreat.setOnClickListener(this); btn_sqlInsert.setOnClickListener(this); btn_sqlUpdate.setOnClickListener(this); btn_sqlQuerry.setOnClickListener(this); } @Override public void onClick(View arg0) { switch (arg0.getId()) { case R.id.sqlCreate://Create and/or open a database that will be used for reading and writing. SQLiteDatabase sqldb = dbh.getWritableDatabase();// System.out.println("create or open database success!"); break; case R.id.sqlInsert: ContentValues ctv = new ContentValues(); // 得到ContentValues對象 ctv.put("userId", 1); // 放入鍵值對，鍵要與列名一致，值要與列的數據類型一致 ctv.put("userName", "小名"); // 放入鍵值對，鍵要與列名一致，值要與列的數據類型一致 SQLiteDatabase sqldb1 = dbh.getWritableDatabase();// 得到一個SQLiteDatabase對象，用於操控數據庫 sqldb1.insert("userinfo", null, ctv);// 增加數據庫記錄 System.out.println("success insert a new content!"); break; case R.id.sqlUpdate: ContentValues ctv1 = new ContentValues(); ctv1.put("userName", "小明"); SQLiteDatabase sqldb2 = dbh.getWritableDatabase();// 得到一個SQLiteDatabase對象，用於操控數據庫 try { sqldb2.update("userinfo", ctv1, "userId=?", new String[] { "1" });// 更新數據庫記錄 } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("success updata the content!"); break; case R.id.sqlQuerry: SQLiteDatabase sqldb3 = dbh.getWritableDatabase();// 得到一個SQLiteDatabase對象，用於操控數據庫 Cursor cursor; try { cursor = sqldb3.query("userinfo", new String[] { "userId", "userName" }, "userId=?", new String[] { "1" }, null, null, null); while (cursor.moveToNext()) { // 打印輸出 String name = cursor.getString(cursor .getColumnIndex("userName")); System.out.println("query result:-->neme=" + name); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } }} |
3，關於SQLiteOpenHelper的其他方法可查看api文檔http://tool.oschina.net/apidocs/apidoc?api=android/reference