引起：android.database.sqlite.SQLiteException：沒有這樣的列：TITLE（代碼1）：，編譯時：SELECT TITLE，STORY FROM MY_TABLE

Question

我正在研究一個簡單的應用程序，其中包含短篇故事，我試圖用一個數據庫，但我得到了一個錯誤：

Caused by: android.database.sqlite.SQLiteException: no such column: TITLE (code 1): , while compiling: SELECT TITLE, STORY FROM MY_TABLE

SQLiteActivity.java

package com.scriptos.testsqlit; 
import android.content.ContentValues; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.database.sqlite.SQLiteOpenHelper; 

public class SQLiteActivity { 
    private static String DBNAME = "Sqlite_simple.db"; 
    private static String TABLE = "MY_TABLE"; 
    private static String COLUMN_1 = "TITLE"; 
    private static String COLUMN_2 = "STORY"; 


    private SQLiteDatabase database; 
    private SQLiteOpenHelper helper_database; 

    private Context context; 

    public SQLiteActivity(Context c){ 
     context = c; 
    } 

    public SQLiteActivity Read() throws android.database.SQLException { 
     helper_database = new SQLiteHelper(context, DBNAME, null, 1); 
     database = helper_database.getReadableDatabase(); 
     return this; 
    } 

    public SQLiteActivity Write() throws android.database.SQLException { 
     helper_database = new SQLiteHelper(context, DBNAME, null, 1); 
     database = helper_database.getWritableDatabase(); 
     return this; 
    } 

    public void close(){ 
     helper_database.close(); 
    } 

    public long insert(String title, String story){ 
     ContentValues contentValues = new ContentValues(); 
     contentValues.put(COLUMN_1, title); 
     contentValues.put(COLUMN_2, story); 

     return database.insert(TABLE, null, contentValues); 
    } 

    public int deleteAll(){ 
     return database.delete(TABLE, null, null); 
    } 

    public String[] getAll(){ 
     String[] columns = new String[]{COLUMN_1,COLUMN_2}; 
     Cursor cursor = database.query(TABLE, columns, 
       null, null, null, null, null); 

     String [] result = new String[cursor.getCount()]; 
     int title = cursor.getColumnIndex(COLUMN_1); 
     int story = cursor.getColumnIndex(COLUMN_2); 

     int a = 0; 
     for(cursor.moveToFirst(); !(cursor.isAfterLast()); cursor.moveToNext()){ 
      result [a] = 
        cursor.getString(title) + " " + 
        cursor.getString(story) ; 
      a++; 
     } 

     return result; 
    } 

    public class SQLiteHelper extends SQLiteOpenHelper { 

     public SQLiteHelper(Context context, String name, 
          SQLiteDatabase.CursorFactory factory, int version) { 
      super(context, name, factory, version); 
     } 

     @Override 
     public void onCreate(SQLiteDatabase db) { 
      // TODO Auto-generated method stub 
      db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE + " (ID INTEGER KEY, "+COLUMN_1+ "TEXT, "+COLUMN_2 +"TEXT);"); 
     } 

     @Override 
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
      // TODO Auto-generated method stub 
     } 
    } 
} 

MainActivity.java

package com.scriptos.testsqlit; 

import android.app.Activity; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.ArrayAdapter; 
import android.widget.ListView; 

public class MainActivity extends Activity { 
    ListView listView; 
    SQLiteActivity db; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.content_main); 

     listView = (ListView) findViewById(R.id.list); 
     String[] adapter = new String[] { "a", "b", "c",}; 

     ArrayAdapter<String> i = new ArrayAdapter<String>(this, 
       android.R.layout.simple_list_item_1, adapter); 

     listView.setAdapter(i); 

     listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
            int position, long id) { 
       if (position == 0) { 
        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("http://andrody.com/")); 
        startActivity(i); 
       } 
       if (position == 1) { 
        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("https://m.facebook.com/andrody2015")); 
        startActivity(i); 
       } 
       if (position == 2) { 
        Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse("https://m.youtube.com/channel/UCAGUgnnL47fU3TMRhKhkQwQ")); 
        startActivity(i); 
       } 
      } 
     }); 


     db = new SQLiteActivity(this); 
     db.Write(); 
     db.deleteAll(); 
     db.insert("title1", "story1"); 
     db.insert("title2","story2"); 
     db.insert("title3","story3"); 
     db.close(); 


     SHOW(); 
    } 

    public void SHOW() { 
     db.Read(); 
     String [] x = db.getAll(); 
     db.close(); 
    } 
} 

content_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
android:orientation="vertical"> 

    <ScrollView 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:background="#fff5ffcf"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="fill_parent" 
      android:orientation="vertical"> 

      <ListView 
       android:id="@+id/list" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 
      </ListView> 
     </LinearLayout> 
    </ScrollView> 
</LinearLayout> 

我該怎麼做才能糾正這個問題？

Answer 1

您創建表格行;

db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE + 
    " (ID INTEGER KEY, "+COLUMN_1+ "TEXT, "+COLUMN_2 +"TEXT);"); 

...生成SQL ...

CREATE TABLE IF NOT EXISTS MY_TABLE (ID INTEGER KEY, TITLETEXT, STORYTEXT); 

...其中，由於缺少空格不是有效的SQL，並不會創建表。

將缺少的空格添加到您的創建表中，並且它應該會更好。

db.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE + 
    " (ID INTEGER KEY, "+COLUMN_1+ " TEXT, "+COLUMN_2 +" TEXT);"); 

CREATE TABLE IF NOT EXISTS MY_TABLE (ID INTEGER KEY, TITLE TEXT, STORY TEXT); 

Answer 2

我覺得沒有空間存在在你創建表

CREATE TABLE IF NOT EXISTS " + TABLE + " (ID INTEGER KEY, "+COLUMN_1+"   
    TEXT, "+COLUMN_2 +" TEXT);"); 

它可能是更好