SQLiteDatabase DROP TABLE IF EXISTS not working
Situation
I need to delete all entries of a specific Table in the database so i figured i would just drop it.
DROP TABLE IF EXISTS LogEntry
I tried running the sql using SQLiteDatabase#execSql(String) and SQLiteDatabase#rawQuery(String, String). I start a transaction before execution it and end it after executing it using SQLiteDatabase#beginTransaction() and SQLiteDatabase#endTransaction().
Problem
In both cases the SQL executed without throwing an Exception but the table still exists. I ran a SELECT Statement right after the drop to see if it worked and it had the same results as before the drop.
android database sqlite asked Nov 21 at 10:15
Basti
423317
|
show 2 more comments
Situation
I need to delete all entries of a specific Table in the database so i figured i would just drop it.
DROP TABLE IF EXISTS LogEntry
I tried running the sql using SQLiteDatabase#execSql(String) and SQLiteDatabase#rawQuery(String, String). I start a transaction before execution it and end it after executing it using SQLiteDatabase#beginTransaction() and SQLiteDatabase#endTransaction().
Problem
In both cases the SQL executed without throwing an Exception but the table still exists. I ran a SELECT Statement right after the drop to see if it worked and it had the same results as before the drop.
android database sqlite asked Nov 21 at 10:15
Basti
423317
1
Why not justdelete from LogEntry. Then you don't need to recreate it
– juergen d
Nov 21 at 10:17
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
beginTransaction()has to be called BEFORE executing your SQL commands.rawQuery()is only used to run queries, not commands. It's actuallyexecSql(), notexecuteSql()
– Fantômas
Nov 21 at 10:53
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -SQLiteOpenHelperlifecycle callbacks are already run inside a transaction.
– laalto
Nov 21 at 11:20
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48
|
show 2 more comments
Situation
I need to delete all entries of a specific Table in the database so i figured i would just drop it.
DROP TABLE IF EXISTS LogEntry
I tried running the sql using SQLiteDatabase#execSql(String) and SQLiteDatabase#rawQuery(String, String). I start a transaction before execution it and end it after executing it using SQLiteDatabase#beginTransaction() and SQLiteDatabase#endTransaction().
Problem
In both cases the SQL executed without throwing an Exception but the table still exists. I ran a SELECT Statement right after the drop to see if it worked and it had the same results as before the drop.
android database sqlite asked Nov 21 at 10:15
Basti
423317
Situation
I need to delete all entries of a specific Table in the database so i figured i would just drop it.
DROP TABLE IF EXISTS LogEntry
I tried running the sql using SQLiteDatabase#execSql(String) and SQLiteDatabase#rawQuery(String, String). I start a transaction before execution it and end it after executing it using SQLiteDatabase#beginTransaction() and SQLiteDatabase#endTransaction().
Problem
In both cases the SQL executed without throwing an Exception but the table still exists. I ran a SELECT Statement right after the drop to see if it worked and it had the same results as before the drop.
android database sqlite android database sqlite asked Nov 21 at 10:15
Basti
423317
asked Nov 21 at 10:15
Basti
423317
edited Nov 22 at 7:09
asked Nov 21 at 10:15
Basti
423317
asked Nov 21 at 10:15
Basti
423317
asked Nov 21 at 10:15
Basti
423317
423317
1
Why not justdelete from LogEntry. Then you don't need to recreate it
– juergen d
Nov 21 at 10:17
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
beginTransaction()has to be called BEFORE executing your SQL commands.rawQuery()is only used to run queries, not commands. It's actuallyexecSql(), notexecuteSql()
– Fantômas
Nov 21 at 10:53
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -SQLiteOpenHelperlifecycle callbacks are already run inside a transaction.
– laalto
Nov 21 at 11:20
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48
|
show 2 more comments
1
Why not justdelete from LogEntry. Then you don't need to recreate it
– juergen d
Nov 21 at 10:17
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
beginTransaction()has to be called BEFORE executing your SQL commands.rawQuery()is only used to run queries, not commands. It's actuallyexecSql(), notexecuteSql()
– Fantômas
Nov 21 at 10:53
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -SQLiteOpenHelperlifecycle callbacks are already run inside a transaction.
– laalto
Nov 21 at 11:20
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48
1
1
Why not just
delete from LogEntry. Then you don't need to recreate it– juergen d
Nov 21 at 10:17
Why not just
delete from LogEntry. Then you don't need to recreate it– juergen d
Nov 21 at 10:17
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
beginTransaction() has to be called BEFORE executing your SQL commands. rawQuery() is only used to run queries, not commands. It's actually execSql(), not executeSql()– Fantômas
Nov 21 at 10:53
beginTransaction() has to be called BEFORE executing your SQL commands. rawQuery() is only used to run queries, not commands. It's actually execSql(), not executeSql()– Fantômas
Nov 21 at 10:53
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -
SQLiteOpenHelper lifecycle callbacks are already run inside a transaction.– laalto
Nov 21 at 11:20
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -
SQLiteOpenHelper lifecycle callbacks are already run inside a transaction.– laalto
Nov 21 at 11:20
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48
|
show 2 more comments
1 Answer
1
active
oldest
votes
I believe, assuimg #'s are .'s, the reason is that you have omitted the setTransactionSuccessful, without this endTransaction will rollback (undo everything done in the transaction).
As per :-
Transactions can be nested. When the outer transaction is ended all of
the work done in that transaction and all of the nested transactions
will be committed or rolled back. The changes will be rolled back if
any transaction is ended without being marked as clean (by calling
setTransactionSuccessful). Otherwise they will be committed.
beginTransaction
answered Nov 21 at 10:56
MikeT
14.8k102441
add a comment |
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1 Answer
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votes
I believe, assuimg #'s are .'s, the reason is that you have omitted the setTransactionSuccessful, without this endTransaction will rollback (undo everything done in the transaction).
As per :-
Transactions can be nested. When the outer transaction is ended all of
the work done in that transaction and all of the nested transactions
will be committed or rolled back. The changes will be rolled back if
any transaction is ended without being marked as clean (by calling
setTransactionSuccessful). Otherwise they will be committed.
beginTransaction
answered Nov 21 at 10:56
MikeT
14.8k102441
add a comment |
I believe, assuimg #'s are .'s, the reason is that you have omitted the setTransactionSuccessful, without this endTransaction will rollback (undo everything done in the transaction).
As per :-
Transactions can be nested. When the outer transaction is ended all of
the work done in that transaction and all of the nested transactions
will be committed or rolled back. The changes will be rolled back if
any transaction is ended without being marked as clean (by calling
setTransactionSuccessful). Otherwise they will be committed.
beginTransaction
answered Nov 21 at 10:56
MikeT
14.8k102441
add a comment |
I believe, assuimg #'s are .'s, the reason is that you have omitted the setTransactionSuccessful, without this endTransaction will rollback (undo everything done in the transaction).
As per :-
Transactions can be nested. When the outer transaction is ended all of
the work done in that transaction and all of the nested transactions
will be committed or rolled back. The changes will be rolled back if
any transaction is ended without being marked as clean (by calling
setTransactionSuccessful). Otherwise they will be committed.
beginTransaction
answered Nov 21 at 10:56
MikeT
14.8k102441
I believe, assuimg #'s are .'s, the reason is that you have omitted the setTransactionSuccessful, without this endTransaction will rollback (undo everything done in the transaction).
As per :-
Transactions can be nested. When the outer transaction is ended all of
the work done in that transaction and all of the nested transactions
will be committed or rolled back. The changes will be rolled back if
any transaction is ended without being marked as clean (by calling
setTransactionSuccessful). Otherwise they will be committed.
beginTransaction
answered Nov 21 at 10:56
MikeT
14.8k102441
answered Nov 21 at 10:56
MikeT
14.8k102441
answered Nov 21 at 10:56
MikeT
14.8k102441
answered Nov 21 at 10:56
MikeT
14.8k102441
14.8k102441
add a comment |
add a comment |
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1
Why not just
delete from LogEntry. Then you don't need to recreate it– juergen d
Nov 21 at 10:17
@juergend That would be a possible workaround, but i dont need the table once its empty. Im mostly interested in the reason why the drop statement executes but doesn't have any effect.
– Basti
Nov 21 at 10:36
beginTransaction()has to be called BEFORE executing your SQL commands.rawQuery()is only used to run queries, not commands. It's actuallyexecSql(), notexecuteSql()– Fantômas
Nov 21 at 10:53
Where exactly do you have the transaction? Note the blockquote in @MikeT's answer talking about nested transactions -
SQLiteOpenHelperlifecycle callbacks are already run inside a transaction.– laalto
Nov 21 at 11:20
@Basti You have change your database version ?
– Hardik Parmar
Nov 21 at 16:48