SQLiteOpenHelper 测试

继承 SQLiteOpenHelper  类

public class MyDatabaseHelper extends SQLiteOpenHelper {
    final String createTable = 
            "create table mtb(" +
            "id integer primary key autoincrement," +
            "name varchar(20)," +
            "password varchar(20)" +
            ")";
    final String[] insertData = {
            "insert into mtb(name,password) values('n001','p001')",
            "insert into mtb(name,password) values('n002','p002')",
            "insert into mtb(name,password) values('n003','p003')"
            };

    //第一个使用数据库时候会调用
    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(createTable);
        for(String sql:insertData){db.execSQL(sql);}
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        System.out.println("oldVersion: "+oldVersion+"\n newVersion: "+newVersion);
    }
    
    //name 为数据库名字   用相对路径即可  。  如直接传入数据库名字 “mydb”
    public MyDatabaseHelper(Context context,String name,int version) {
        super(context, name, null,version);
    }
}

使用这个工具类

　　　　  MyDatabaseHelper dbHelp = new MyDatabaseHelper(this, "mydb", 1);
        SQLiteDatabase db = dbHelp.getReadableDatabase();
        db.execSQL("insert into mtb(name,password) values('n004','p004')");