firebird 40 language reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38 3.4.2. TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 3.4.4. Session Time Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.4.5. Time Zone Format. . . . . . 2 3.4.6. Operations Using Date and Time Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 3.4.7. Supplemental Time Zone Features . . . . . . . . . . .0 码力 | 778 页 | 3.43 MB | 1 年前3
Firebird 2.5 Language Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 3.4.2. TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 3.4.4. Operations Using Date and Time Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344 8.4. Date and Time Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 码力 | 521 页 | 2.30 MB | 1 年前3
Firebird Internals: Inside a Firebird Databasepag_generation Four bytes, unsigned. Bytes 0x04 - 0x07. The page generation number. Increments each time the page is written back to disc. pag_scn Four bytes, unsigned. Bytes 0x08 - 0x0b. Originally used is permitted. hdr_creation_date Eight bytes, signed. Bytes 0x2c - 0x33 on the page. The date and time (in Firebird’s own internal format) that the database was either originally created/rewritten or always being page 1, just after the database header page. If more are required, the current PIP points to the next PIP by way of the very last bit on the page itself. The C code representation of the0 码力 | 63 页 | 261.00 KB | 1 年前3
Firebird 2 QuickStartlibraries are in System32, 32-bit libraries in SysWOW64. If you're not aware of this, you may have a hard time locating your 32-bit Firebird components on a 64-bit Windows system. (Incidentally, WOW stands for use the distributed release kit (.exe for Windows, .rpm for Linux), especially if this is the first time you install Firebird. The Windows installation executable, the Linux rpm program and the install.sh to execute two tasks: changing the SYSDBA password and adding a Firebird user. First though, some points of attention: Permission to run gsec With some Firebird installations, you can only run gsec if0 码力 | 40 页 | 218.42 KB | 1 年前3
firebird gfixshadow becomes unusable for some reason, the database will stop accepting new connections until such time as the DBA kills the faulty shadow and, ideally, creates a new shadow to replace the broken one. connect to the database. The command line prompts shows which of the two sessions we are using at the time. First, the initial session is connected to the database and can see that there are two shadow files can occur when an application is updating two (or more) databases at the same time, in the same transaction. At COMMIT time, Firebird will prepare each database for the COMMIT and then COMMIT each database0 码力 | 44 页 | 247.13 KB | 1 年前3
Firebird 2.1.5 Installationoutside the scope of the cursor loop was accepted by the PSQL parser, allowing the likelihood of run-time occurring as a result. Now, it will be rejected in the procedure or trigger definition. NULLS are STRING_ARGUMENT, index scanning is allowed because the conversion is deterministic. (V.2.1) Some date/time expressions in Dialect 1 can not benefit from available indices either, e.g., DATE_ FIELD > 'NOW' ISC_LONG*, short, const ISC_SCHAR*, ISC_EVENT_CALLBACK, void*); It may cause a compile-time incompatibility, as older event handling programs cannot be compiled if they use a bit different signature0 码力 | 46 页 | 217.89 KB | 1 年前3
firebird isql. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51 18.20. SET TIME. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . sql dialect toSET STATs -- toggle display of performance statistics SET TIME -- toggle display of timestamp with DATE values SET TERM -- change each client and database server. These SQL dialects are differentiated in the context of the date-time format, and the precision of a numerical data type. The dialects serve to instruct the Firebird server 0 码力 | 76 页 | 369.92 KB | 1 年前3
Firebird Null Guide: NULL behaviour and pitfalls in Firebird SQL. . . . . . . . . . . . . . . . . . . . . . 66 Table of Contents 3 Chapter 1. What is NULL? Time and again, support questions pop up on the Firebird mailing lists about “strange things” happening will render the entire expression NULL. This guide explores the behaviour of NULL in Firebird SQL, points out common pitfalls and shows you how to deal safely with expressions that contain NULL or may resolve many of us have found out to our chagrin, NULL is contagious: use it in a numerical, string or date/time operation, and the result will invariably be NULL. With boolean operators, the outcome depends on0 码力 | 69 页 | 479.63 KB | 1 年前3
Firebird 1.5 QuickStart Frenchmarche ................................................................................. 9 Autres points nécessaires .................................................................................... Server vs. Superserver Classic Server Superserver Très stable sous Linux; encore pour certains points experimental sous Windows. Très stable sous Windows et Linux. Un processus est créé pour chaque firebird.conf. Comme vous pouvez le constater, aucune des architectures surpasse l'autre sur tous les points. Ce n'est pas vraiment surprenant : Nous ne livrerions pas deux architectures si l'une était vraiment0 码力 | 29 页 | 192.46 KB | 1 年前3
firebird language reference 30 rus.............................................................................................. 35 TIME ................................................................................................. .................................................................................... 390 CURRENT_TIME ................................................................................................. фиксированной точкой (масштабируемые целые числа) в случае если точность числа меньше чем 9. Тип данных TIME доступен и используется для хранения значения только времени. Тип данных DATE хранит информацию о0 码力 | 719 页 | 3.98 MB | 1 年前3
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