error in sqlite "DROP TABLE IF EXISTS" android
Solution 1
The problem seems to be with this statement:
DROP TABLE IF EXISTS 122
where 122
, if it is really the name of the table to drop, is not delimited (with '
, for instance) and thus cannot be treated as a name. But the parser expects a name there. Just enclose the name in single or double quotes, and it should work:
db.execSQL("DROP TABLE IF EXISTS '" + DATABASE_TABLE + "'");
Solution 2
if the table name were all alpha characters, your original code would have worked. Since the table name isn't all alpha, it needs to be surrounded with single quotes.
eli
A little girl goes into a pet show and asks for a wabbit. The shop keeper looks down at her, smiles and says: "Would you like a lovely fluffy little white rabbit, or a cutesy wootesly little brown rabbit?" "Actually", says the little girl, "I don't think my python would notice."
Updated on September 01, 2020Comments
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eli over 3 years
so i have a problem in my DBAdapter class its just crushes when i try to open the database: from the LogCat i guess the problem is in the onUpgrade function:
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { Log.w("SingleDBAdapter", "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL("DROP TABLE IF EXISTS "+DATABASE_TABLE); onCreate(db); } }
here is the error:
07-28 11:32:49.443: E/Database(1244): Failure 1 (near "122": syntax error) on 0x2435b0 when preparing 'DROP TABLE IF EXISTS 122'. 07-28 11:32:49.463: D/AndroidRuntime(1244): Shutting down VM 07-28 11:32:49.463: W/dalvikvm(1244): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 07-28 11:32:49.473: E/AndroidRuntime(1244): FATAL EXCEPTION: main 07-28 11:32:49.473: E/AndroidRuntime(1244): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.shop.list/com.shop.list.main}: android.database.sqlite.SQLiteException: near "122": syntax error: **DROP TABLE IF EXISTS 122** 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread.access$2300(ActivityThread.java:125) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.os.Handler.dispatchMessage(Handler.java:99) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.os.Looper.loop(Looper.java:123) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread.main(ActivityThread.java:4627) 07-28 11:32:49.473: E/AndroidRuntime(1244): at java.lang.reflect.Method.invokeNative(Native Method) 07-28 11:32:49.473: E/AndroidRuntime(1244): at java.lang.reflect.Method.invoke(Method.java:521) 07-28 11:32:49.473: E/AndroidRuntime(1244): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 07-28 11:32:49.473: E/AndroidRuntime(1244): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 07-28 11:32:49.473: E/AndroidRuntime(1244): at dalvik.system.NativeStart.main(Native Method) 07-28 11:32:49.473: E/AndroidRuntime(1244): Caused by: android.database.sqlite.SQLiteException: near "122": syntax error: DROP TABLE IF EXISTS 122 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1727) 07-28 11:32:49.473: E/AndroidRuntime(1244): at com.shop.list.ListDBAdapter$DatabaseHelper.onUpgrade(ListDBAdapter.java:51) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:108) 07-28 11:32:49.473: E/AndroidRuntime(1244): at com.shop.list.ListDBAdapter.open(ListDBAdapter.java:60) 07-28 11:32:49.473: E/AndroidRuntime(1244): at com.shop.list.main.onCreate(main.java:60) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 07-28 11:32:49.473: E/AndroidRuntime(1244): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627) 07-28 11:32:49.473: E/AndroidRuntime(1244): ... 11 more
i highlighted the problem but i cant solve it :/