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<hr><p align="left"><small>发信人: Zeemon (塞下秋), 信区: Visual <br>
标 题: Delphi(8) <br>
发信站: BBS 水木清华站 (Tue Nov 11 20:03:36 1997) <br>
<br>
下文由idol (沉默的人)在浙大BBS西子浣纱城站发表 <br>
<br>
Database <br>
-------- <br>
The Database Desktop does not display automatically created <br>
aliases for ODBC datasources. Always use static, manually <br>
created aliases with the ODBC driver. <br>
<br>
Due to a known bug in Microsoft's ODBC 3.4, connecting to <br>
a database twice with this driver can cause Delphi to shut <br>
down. This problem is fixed in ODBC 3.5. <br>
<br>
The BDE no longer supports DbiUseIdleTime. Use <br>
DbiSaveChanges instead. <br>
<br>
Local SQL queries require a table qualifier or alias name <br>
if the field name is in quotation marks. Examples: <br>
<br>
(BAD) select name AS "First Name" from customer <br>
(OK) select name AS customer."First Name" from customer <br>
(OK) select name AS c."First Name" from customer c <br>
<br>
When you use cached updates, changes made to indexed table <br>
fields are not reflected until the updates are applied. <br>
<br>
If you use cached updates with master/detail tables, TQuery will <br>
re-execute the detail query each time the master record moves. <br>
<br>
Constraint properties for a TField object on a client <br>
dataset are ignored. <br>
<br>
The floating-point format required for custom constraints is <br>
inconsistent with international Windows settings. Always use <br>
periods (.) for decimals in custom constraints. <br>
<br>
Output BLOB parameters are not supported in stored procedures. <br>
<br>
Drag-and-drop copying of tables in the Database Explorer copies <br>
only metadata. Data copying will be supported in future releases. <br>
<br>
Date-grouping on TClientDataSet is not supported in this version. <br>
Date-grouping on TClientDataSet is not supported in this version. <br>
<br>
If an exception occurs inside the FormCreate event of a <br>
remote data module, the excpetion is displayed interactively. <br>
We recommend including a "try ... except" clause to handle <br>
exceptions in these events. <br>
<br>
Save table-level constraints in the Dictionary in the Database <br>
Explorer, then read them from Delphi. (Use UpdateDataSet in <br>
DRIntF.INT.) Saving constraints from Delphi will be supported <br>
in future releases. <br>
<br>
The Database Explorer does not support DB2 on the MVS <br>
or AS/400 platform. <br>
<br>
When setting the BLOB SIZE parameter in the BDE configuration <br>
for the Oracle SQL Links driver, add one to the size to prevent <br>
data loss. For example, to retrieve 32k of data, set BLOB SIZE <br>
to 33 instead of 32. <br>
<br>
Informix users should have the latest client DLLs <br>
(e.g. ISQLT07C.DLL) from Informix. Otherwise you <br>
may get occasional access violations when using <br>
the SQL Explorer. <br>
<br>
If you open a BLOB field on an Informix 7.2 server, <br>
using the Next method to move to another record causes <br>
the server to crash. This is a known problem with the <br>
Informix 7.2 software. <br>
<br>
The CT-Lib driver works with Sybase version 10.0.4 EBF7033 <br>
or higher. <br>
<br>
If you use Sybase drivers with cached updates or client <br>
data sets, and you use a NUMERIC or DECIMAL field, make <br>
sure ENABLE BCD is set to True in the BDE Administrator. <br>
<br>
If you use the Sybase CT-Lib driver, you can't use the <br>
pbBlank parameter to check whether a text field is blank; <br>
the parameter always returns False. Also, blank BLOBs are <br>
always shown as not blank. <br>
<br>
To see Oracle Sequences with the Database Explorer, set <br>
ENABLE BCD to False in the BDE Administrator. <br>
<br>
<br>
Decision Support Components <br>
--------------------------- <br>
If you use the Decision Query editor to access tables that <br>
are not owned by the login user, the generated SQL statements <br>
may by syntactically incorrect. Specifically, you may see <br>
<br>
"OwnerName.TableName" <br>
<br>
where the correct syntax is <br>
<br>
"OwnerName"."TableName" <br>
<br>
If this happens, use the String List editor to edit the dialect <br>
part of the query manually in the TDecisionQuery.SQL property. <br>
(If you open the Decision Cube editor again, however, your edited <br>
query will be overwritten with the incorrect one.) <br>
<br>
The same syntax problem causes the Decision Query to display <br>
an error message when you run the Decision Cube. The message <br>
tells you that the query fields cannot be automatically mapped <br>
to dimensions and summaries. If you get this error message, run <br>
the Decision Cube editor and provide the necessary field name, <br>
grouping, and dimension type manually. <br>
<br>
For more information about using these components, see the <br>
Documentation Updates section above. <br>
<br>
A bug in Intersolve's ODBC-Oracle driver causes it to interpret <br>
"--" as a comment to the end of the file (rather than to the end <br>
of the line). If you are using the Intersolve driver, move lines <br>
that start with "--" to the bottom of the query. Do not remove the <br>
lines altogether, since the Decision Query component uses them. <br>
<br>
<br>
-- <br>
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