Android编程5：数据库Sql编程

本文博客链接:http://blog.youkuaiyun.com/jdh99,作者:jdh,转载请注明.

Android中安装轻量级数据库Sqlite,现在测试数据库基本操作。

参考hosterZhu的博客，链接：http://blog.youkuaiyun.com/hosterZhu/article/details/6133927

数据库基本操作：创建表，插入，删除可以用execSQL();读取可以用rawQuery();这两个函数都可以标准SQL语句进行操作.

源代码：

package com.test.sql; import android.app.Activity; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQLiteOpenHelper; import android.os.Bundle; import android.util.Log; public class test_sql extends Activity { DatabaseHelper mOpenHelper; private static final String DATABASE_NAME = "test.db"; private static final int DATABASE_VERSION = 1; private static class DatabaseHelper extends SQLiteOpenHelper { DatabaseHelper(Context context) { super(context, DATABASE_NAME, null, DATABASE_VERSION); } @Override public void onCreate(SQLiteDatabase db) { //新建一个用户表 //共有5项：Id Pwd Name OnLineTime Level db.execSQL("CREATE TABLE User_Table ('Id' INT,'Pwd' VARCHAR,'Name' VARCHAR,'OnLineTime' INT,'Level' INT)"); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { } } /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mOpenHelper = new DatabaseHelper(this); SQLiteDatabase db = mOpenHelper.getWritableDatabase(); //清空数据 db.execSQL("DELETE FROM User_Table"); //插入数据10000 123456 "jdh" 0 0 //插入数据10001 123456 "jim" 0 0 db.execSQL("INSERT INTO User_Table VALUES (?,?,?,?,?)", new Object[]{10000,"123456","jdh",0,0}); db.execSQL("INSERT INTO User_Table VALUES (?,?,?,?,?)", new Object[]{10001,"123456","jim",0,0}); //读取数据 Cursor cursor = db.rawQuery("SELECT * FROM User_Table WHERE Name = ?",new String[]{"jdh"}); while (cursor.moveToNext()) { String str = cursor.getInt(0) + cursor.getString(1) + cursor.getString(2) + cursor.getInt(3) + cursor.getInt(4); Log.i("str:", str); } } }