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Overview
Comment: | Clarification to the order of arguments in like() and glob(). |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | branch-3.25 |
Files: | files | file ages | folders |
SHA3-256: |
86e05fde50fbab3798dd2f4cec510f08 |
User & Date: | drh 2018-09-25 19:28:49.165 |
Context
2018-09-25
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19:32 | Version 3.25.2 (check-in: 8c31c0cd8c user: drh tags: release, version-3.25.2, branch-3.25) | |
19:28 | Clarification to the order of arguments in like() and glob(). (check-in: 86e05fde50 user: drh tags: branch-3.25) | |
19:28 | Update the sha3 sum for sqlite3.c for version 3.25.2. (check-in: 31377cc26a user: dan tags: branch-3.25) | |
Changes
Changes to pages/lang.in.
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2442 2443 2444 2445 2446 2447 2448 | 2 arguments. } funcdef {glob(X,Y)} {} { ^The glob(X,Y) function is equivalent to the expression "<b>Y GLOB X</b>". Note that the X and Y arguments are reversed in the glob() function | | > > > > > | | 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 | 2 arguments. } funcdef {glob(X,Y)} {} { ^The glob(X,Y) function is equivalent to the expression "<b>Y GLOB X</b>". Note that the X and Y arguments are reversed in the glob() function relative to the infix [GLOB] operator. Y is the string and X is the pattern. So, for example, the following expressions are equivalent: <blockquote><pre> name LIKE '*helium*' glob('*helium*',name) </pre></blockquote> <p>^If the [sqlite3_create_function()] interface is used to override the glob(X,Y) function with an alternative implementation then the [GLOB] operator will invoke the alternative implementation. } funcdef {ifnull(X,Y)} {} { ^The ifnull() function returns a copy of its first non-NULL argument, or NULL if both arguments are NULL. ^Ifnull() must have exactly 2 arguments. |
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2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 | funcdef {like(X,Y) like(X,Y,Z)} {} { ^The like() function is used to implement the "<b>Y LIKE X [ESCAPE Z]</b>" expression. ^If the optional ESCAPE clause is present, then the like() function is invoked with three arguments. ^Otherwise, it is invoked with two arguments only. Note that the X and Y parameters are reversed in the like() function relative to the infix [LIKE] operator. ^The [sqlite3_create_function()] interface can be used to override the like() function and thereby change the operation of the [LIKE] operator. When overriding the like() function, it may be important to override both the two and three argument versions of the like() function. Otherwise, different code may be called to implement the [LIKE] operator depending on whether or not an ESCAPE clause was specified. | > > > > > > | 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 | funcdef {like(X,Y) like(X,Y,Z)} {} { ^The like() function is used to implement the "<b>Y LIKE X [ESCAPE Z]</b>" expression. ^If the optional ESCAPE clause is present, then the like() function is invoked with three arguments. ^Otherwise, it is invoked with two arguments only. Note that the X and Y parameters are reversed in the like() function relative to the infix [LIKE] operator. X is the pattern and Y is the string to match against that pattern. Hence, the following expressions are equivalent: <blockquote><pre> name LIKE '%neon%' like('%neon%',name) </pre></blockquote> ^The [sqlite3_create_function()] interface can be used to override the like() function and thereby change the operation of the [LIKE] operator. When overriding the like() function, it may be important to override both the two and three argument versions of the like() function. Otherwise, different code may be called to implement the [LIKE] operator depending on whether or not an ESCAPE clause was specified. |
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