我学习ophone里使用sqlite3

写得很辛苦，大家觉得好的话请多多回帖支持我，有时间会发布第二篇

演示环境

Windows xp

Eclipse 3.4.2

Ophone SDK 1.0

 

一、 创建工程

在Eclipse里

File->new->Android project->输入工程名sqlite_demo等等如下图:->点击完成

 

 

二、建立数据库连接类

在src下oms.sqlite_demo下新建DBHelper类

写代码如下

 

/*class DBHelper code start*/
package oms.sqlite_demo;

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

/**
 * 数据库连接类
 *
 * @author yifangyou 2010-01-15
 *
 */
public class DBHelper extends SQLiteOpenHelper {
    private static SQLiteDatabase db = null;
    /**
     * 连接数据库，数据库不存在则创建
     *
     * @param Context context, 内容上限文
     * @param String dbname, 数据库名字
     * @param CursorFactory factory, 数据库游标
     * @param int version, 数据库版本
     * @return SQLiteDatabase 返回数据库操作类
     */
    public DBHelper(Context context, String dbname, CursorFactory factory,
            int version) {
        super(context, dbname, factory, version);
    }
    /**
     * 连接数据库，数据库不存在则创建
     *
     * @return SQLiteDatabase 返回数据库操作类
     */
    public SQLiteDatabase getconnect() {
        if (db == null) {
            db = this.getWritableDatabase();
        }
        return db;
    }
    /**
     * 断开数据库连接
     *
     * @return void
     */
    public void close() {
        if (db != null) {
            db.close();
        }
    }

    @Override
    public void onCreate(SQLiteDatabase arg0) {

    }

    @Override
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {

    }
}
/* class DBHelper code end */

三、操作数据库

在sqlite_demo.java里的代码如下

 

package oms.sqlite_demo;

import android.app.Activity;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;


public class sqlite_demo extends Activity {
    private final String DB_NAME = "testdb";
    private final String TABLE_NAME = "student";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        DBHelper dbh=new DBHelper(this.getBaseContext(),DB_NAME, null,1);
        SQLiteDatabase db= dbh.getconnect();
        createTable(db);
        queryTable(db);
        dbh.close();
    }


public void createTable( SQLiteDatabase db){
        db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_NAME + " ("
                + "stud_no" + " TEXT,"
                + "stud_name" + " TEXT"
                + ");");

        String sql_1 = "insert into "+ TABLE_NAME +" (stud_no, stud_name) values('S777', 'Lily Chang');";
        String sql_2 = "insert into " + TABLE_NAME +" (stud_no, stud_name) values('S888', 'Linda Lin');";
        String sql_3 = "insert into " + TABLE_NAME +" (stud_no, stud_name) values('S999', 'Bruce Wang');";
        db.execSQL(sql_1); db.execSQL(sql_2); db.execSQL(sql_3);
    }
    public void queryTable(SQLiteDatabase db){
        String str="select * from "+TABLE_NAME;
        Cursor c =db.rawQuery(str,null);

        Log.v("loginactive","查询记录");
        Log.v("loginactive",String.valueOf(c.getCount()) );
        if(c!=null){
            c.moveToFirst();
            while(!c.isLast()){
                Log.v("loginactive","outp.");
                String stud_no=c.getString(0);
                String stud_name=c.getString(1);
                System.out.println(stud_no+"---------------"+stud_name);
                Log.v("loginactive",stud_no+"---------------"+stud_name);
                c.moveToNext();
            }
        }

    }
}

四、启动DDMS

在eclipse里

Window->New Perspective->DDMS

 

五、运行

选择">"里的run configure->如下图填完后->apply->run

 

六、查看结果

点击run后马上点击右上角的DDMS就能在log里看到结果

七、命令行下查看数据库

Cd $OPHONE_HOME/tools

adb pull /data/data/oms.sqlite_dmoe/databases/testdb test.db

sqlite3 test.db