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Overview
| Comment: | Add documentation for the Tcl command "db function" -returntype option. |
|---|---|
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
2f154421cf36d22902764ee9df3da353 |
| User & Date: | dan 2019-02-27 16:51:20 |
Context
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2019-02-28
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| 17:29 | Documentation on the bind_falback method of the TCL interface. check-in: fb20146338 user: drh tags: trunk | |
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2019-02-27
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| 16:51 | Add documentation for the Tcl command "db function" -returntype option. check-in: 2f154421cf user: dan tags: trunk | |
| 13:46 | Updates to the althttpd.md documentation. check-in: 9ea89e32bf user: drh tags: trunk | |
Changes
Changes to pages/tclsqlite.in.
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<dt><b>-deterministic</b>
<dd><p>
This option indicates that the function will always return the same
answer given the same argument values. The SQLite query optimizer
uses this information to cache answers from function calls with
constant inputs and reuse the result rather than invoke the function
repeatedly.
</dl>
</blockquote>
}
##############################################################################
METHOD nullvalue {
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<dt><b>-deterministic</b> <dd><p> This option indicates that the function will always return the same answer given the same argument values. The SQLite query optimizer uses this information to cache answers from function calls with constant inputs and reuse the result rather than invoke the function repeatedly. </dl> <dt><b>-returntype integer|real|text|blob|any</b> <dd><p> This option is used to configure the type of the result returned by the function. If this option is set to "any" (the default), SQLite attempts to determine the type of each value returned by the function implementation based on the Tcl value's internal type. Or, if it is set to "text" or "blob", the returned value is always a text or blob value, respectively. If this option is set to "integer", SQLite attempts to coerce the value returned by the function to an integer. If this is not possible without data loss, it attempts to coerce it to a real value, and finally falls back to text. If this option is set to "real", an attempt is made to return a real value, falling back to text if this is not possible. </dl> </blockquote> } ############################################################################## METHOD nullvalue { |