android之SQlite创建数据库操作

创建数据库

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DBOpenHelper extends SQLiteOpenHelper {
    private static final String DATABASENAME = "mydb.db"; //数据库名称
    private static final int DATABASEVERSION = 2;//数据库版本

    public DBOpenHelper(Context context) {
        super(context, DATABASENAME, null, DATABASEVERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE person (personid integer primary key autoincrement, name varchar(20), amount integer)");//执行有更改的sql语句
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS person");
        onCreate(db);
    }

}