android - Kotlin/Android : android. database.sqlite.SQLiteException : no such table: Table_xx (code 1 SQLITE_ERROR): , 编译时:select * from Table_xx

Question

我在访问我的表时遇到问题，但无法知道问题出在哪里。该表在 SQL select * from Table_xx 中存在良好。

不知道no such table的错误信息是不是真的是缺表的问题...

class DBLocal(context: Context, name: String?, factory: SQLiteDatabase.CursorFactory?, version: Int) : SQLiteOpenHelper(context, DATABASE_NAME, factory, DATABASE_VERSION)
{

    override fun onCreate(db: SQLiteDatabase)
    {
        print(DATABASE_NAME)
    }

    override fun onUpgrade(db: SQLiteDatabase, oldVersion: Int, newVersion: Int)
    {
    }
    fun methodToSelectData(strQuery: String)/*, completion: @escaping (_ result:*/
    {
         print("test")

        val list = ArrayList<String>()
        val db = this.readableDatabase


        val c = db.rawQuery(strQuery, null)

        if (c.moveToFirst()) {
            do {
                list.add(c.getString(c.getColumnIndexOrThrow("lng")))
            } while (c.moveToNext())
        }
        c.close()
        db.close()
    }

    fun methodToInsertUpdateDeleteData(strQuery: String)/*, completion: @escaping (_ result: Bool) -> Void)*/
    {

    }
    companion object {
        private val DATABASE_VERSION = 1
        private val DATABASE_NAME = "Local.db"
    }

提前致谢。

Answer 1

最好创建自己的数据库并从 Assets 中导入: https://medium.com/@johann.pardanaud/ship-an-android-app-with-a-pre-populated-database-cd2b3aa3311f