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Overview
| Comment: | Break a big testable statement in lang_expr.html into several smaller blocks. |
|---|---|
| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
61d45eaf94f2457f87ed9e97621d862e |
| User & Date: | dan 2010-08-14 12:25:02.000 |
Context
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2010-08-21
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| 19:11 | Preparations for the 3.7.1 release. (check-in: fb2b8b097b user: drh tags: trunk) | |
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2010-08-14
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| 12:25 | Break a big testable statement in lang_expr.html into several smaller blocks. (check-in: 61d45eaf94 user: dan tags: trunk) | |
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2010-08-13
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| 17:44 | Enhancements to the description of how the COLLATE operator works. (check-in: 17093bc7d6 user: drh tags: trunk) | |
Changes
Changes to pages/lang.in.
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^A literal value can also be the token "NULL".
</p>
<tcl>hd_fragment varparam parameter parameters {bound parameter} {bound parameters}</tcl>
<h3>Parameters</h3>
<p>
A "variable" or "parameter" token
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^A literal value can also be the token "NULL".
</p>
<tcl>hd_fragment varparam parameter parameters {bound parameter} {bound parameters}</tcl>
<h3>Parameters</h3>
<p>
A "variable" or "parameter" token
specifies a placeholder in the expression for a
value that is filled in at runtime using the
[sqlite3_bind_blob() | sqlite3_bind()] family of C/C++ interfaces.
Parameters can take several forms:
</p>
<blockquote>
<table>
<tr>
<td align="right" valign="top"><b>?</b><i>NNN</i></td><td width="20"></td>
<td>^(A question mark followed by a number <i>NNN</i> holds a spot for the
NNN-th parameter. NNN must be between 1 and [SQLITE_MAX_VARIABLE_NUMBER].)^
</td>
</tr>
<tr>
<td align="right" valign="top"><b>?</b></td><td width="20"></td>
<td>^A question mark that is not followed by a number creates a parameter
with a number one greater than the largest parameter number already assigned.
^If this means the parameter number is greater than
[SQLITE_MAX_VARIABLE_NUMBER], it is an error.
</td>
</tr>
<tr>
<td align="right" valign="top"><b>:</b><i>AAAA</i></td><td width="20"></td>
<td>^A colon followed by an identifier name holds a spot for a
[sqlite3_bind_parameter_name|named parameter] with the name :AAAA.
^(Named parameters are also numbered. The number assigned is one greater than
the largest parameter number already assigned.)^ ^If this means the parameter
would be assigned a number greater than [SQLITE_MAX_VARIABLE_NUMBER], it is
an error. To avoid confusion, it is best to avoid mixing named and numbered
parameters.</td>
</tr>
<tr>
<td align="right" valign="top"><b>@</b><i>AAAA</i></td><td width="20"></td>
<td>^An "at" sign works exactly like a colon, except that the name of
the parameter created is @AAAA.</td>
</tr>
<tr>
<td align="right" valign="top"><b>$</b><i>AAAA</i></td><td width="20"></td>
<td>^A dollar-sign followed by an identifier name also holds a spot for a named
parameter with the name $AAAA. ^(The identifier name in this case can include
one or more occurrences of "::" and a suffix enclosed in "(...)" containing
any text at all.)^ This syntax is the form of a variable name in the
[http://www.tcl.tk/ | Tcl programming language]. The presence
of this syntax results from the fact that SQLite is really a
[Tcl extension] that has escaped into the wild.</td>
</tr>
</table>
</blockquote>
<p>^Parameters that are not assigned values using
[sqlite3_bind_blob() | sqlite3_bind()] are treated
as NULL.</p>
<tcl>hd_fragment like LIKE ESCAPE</tcl>
<h3>The LIKE and GLOB operators</h3>
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