将初始数据插入sql lite android

养成良好格式化代码的习惯。最后一个列定义没有逗号：

    String CREATE_USER_TABLE = "CREATE TABLE " + TABLE_USER  + "("  + KEY_ID      + " INTEGER PRIMARY KEY AUTOINCREMENT, "  + KEY_NAME    + " TEXT, " + KEY_EMAIL   + " TEXT, "  + KEY_PW      + " TEXT, " + KEY_SESSION + " INTEGER " + ")";    String CREATE_EXPENSE_TYPE_TABLE = "CREATE TABLE " + TABLE_EXPENSE_TYPE + "("  + KEY_EXPENSE_ID   + " INTEGER AUTOINCREMENT, " + KEY_EXPENSE_TYPE + " TEXT PRIMARY KEY " + ")";