Home » U++ Library support » U++ SQL » Access to S_* Structure of TABLE crash Application.
| Re: PROPOSAL: Access to S_* Structure of TABLE crash Application. [message #36306 is a reply to message #36305] |
Sat, 19 May 2012 03:12   |
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Messages: 301
Registered: November 2008
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Senior Member |
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| sergeynikitin wrote on Sat, 19 May 2012 02:02 |
Talk about that (even in SQLite) you can execute the query
SELECT PLANT.NAME FROM PLANT
and it will be correctly understood by the SQL driver.
(By the way, - try make DUMP of NAME.Of(PLANT))
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SQL * Select(PLANT(NAME)).From(PLANT);
LOG(SQL.ToString());
while (SQL.Fetch()) {
DUMP(SQL.GetColumnInfo(0).name); // returns "NAME"
DUMP(NAME.Of(PLANT)); // returns PLANT\nNAME
DUMP(SQL[NAME]); // returns correct value, associated with "NAME" column
DUMP(SQL[0]); // returns previous value
DUMP(SQL[NAME.Of(PLANT)]); // "Assertion failed" here
}
With following output:
select PLANT.NAME from PLANT
SQL.GetColumnInfo(0).name = NAME
NAME.Of(PLANT) = PLANT
NAME
SQL[NAME] = First Plant
SQL[0] = First Plant
Assertion failed in C:\upp\uppsrc\Sql\Sql.cpp, line 339
0
| sergeynikitin wrote on Sat, 19 May 2012 02:02 |
I do not understand how the subject is connected with the function of sqlite3_column_name
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The subject is connected with incorrect using of S_* structure, which throws "Assertion failed", because of requested empty column. The sqlite3_column_name function is related to SQLite database and how U++ wrapper uses it to get result set. Therefore, I said, that it is dependent from concrete database.
I think, you are free to propose your changes, if you want. So, U++ developers, which responsible to SQL parts of U++, might analyse it and return the answer to you.
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