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Overview
Comment:Update the TCL binding documentation to describe the newly added ability to specify TCL variable names in the body of an SQL statement. (CVS 1904)
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SHA1: b3b9e58103dd6c65c55caf9a25bc1c257b37df88
User & Date: drh 2004-08-26 01:12:14.000
Context
2004-08-28
01:12
Add sqlite_temp_directory to the windows driver. (CVS 1905) (check-in: f5b0e5b0b2 user: drh tags: trunk)
2004-08-26
01:12
Update the TCL binding documentation to describe the newly added ability to specify TCL variable names in the body of an SQL statement. (CVS 1904) (check-in: b3b9e58103 user: drh tags: trunk)
00:56
Protect Tcl_Obj pointers from change using Tcl_IncrRefCount() while executing SQL statements in the TCL bindings. (CVS 1903) (check-in: 6199f2f243 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to www/tclsqlite.tcl. 
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#
# Run this Tcl script to generate the tclsqlite.html file.
#
set rcsid {$Id: tclsqlite.tcl,v 1.10 2004/07/21 14:54:50 drh Exp $}
source common.tcl
header {The Tcl interface to the SQLite library}
proc METHOD {name text} {
  puts "<a name=\"$name\">\n<h3>The \"$name\" method</h3>\n"
  puts $text
}
puts {
<h2>The Tcl interface to the SQLite library</h2>

<p>The SQLite library is designed to be very easy to use from
a Tcl or Tcl/Tk script.  This document gives an overview of the Tcl
programming interface.</p>

<h3>The API</h3>

<p>The interface to the SQLite library consists of single
tcl command named <b>sqlite</b> (version 2.8) or <b>sqlite3</b>
(version 3.0).  Because there is only this
one interface command, the interface is not placed in a separate
namespace.</p>

<p>The <b>sqlite3</b> command is used as follows:</p>

<blockquote>
<b>sqlite3</b>&nbsp;&nbsp;<i>dbcmd&nbsp;&nbsp;database-name</i>
</blockquote>




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#
# Run this Tcl script to generate the tclsqlite.html file.
#
set rcsid {$Id: tclsqlite.tcl,v 1.11 2004/08/26 01:12:14 drh Exp $}
source common.tcl
header {The Tcl interface to the SQLite library}
proc METHOD {name text} {
  puts "<a name=\"$name\">\n<h3>The \"$name\" method</h3>\n"
  puts $text
}
puts {
<h2>The Tcl interface to the SQLite library</h2>

<p>The SQLite library is designed to be very easy to use from
a Tcl or Tcl/Tk script.  This document gives an overview of the Tcl
programming interface.</p>

<h3>The API</h3>

<p>The interface to the SQLite library consists of single
tcl command named <b>sqlite</b> (version 2.8) or <b>sqlite3</b>
(version 3.0).  Because there is only this
one command, the interface is not placed in a separate
namespace.</p>

<p>The <b>sqlite3</b> command is used as follows:</p>

<blockquote>
<b>sqlite3</b>&nbsp;&nbsp;<i>dbcmd&nbsp;&nbsp;database-name</i>
</blockquote>
︙︙
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<p>
The most useful <i>dbcmd</i> method is "eval".  The eval method is used
to execute SQL on the database.  The syntax of the eval method looks
like this:</p>

<blockquote>
<i>dbcmd</i>&nbsp;&nbsp;<b>eval</b>&nbsp;&nbsp;<i>sql</i>
&nbsp;&nbsp;&nbsp;&nbsp;?<i>array-name&nbsp;&nbsp;script</i>?
</blockquote>

<p>
The job of the eval method is to execute the SQL statement or statements
given in the second argument.  For example, to create a new table in
a database, you can do this:</p>









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<p>
The most useful <i>dbcmd</i> method is "eval".  The eval method is used
to execute SQL on the database.  The syntax of the eval method looks
like this:</p>

<blockquote>
<i>dbcmd</i>&nbsp;&nbsp;<b>eval</b>&nbsp;&nbsp;<i>sql</i>
&nbsp;&nbsp;&nbsp;&nbsp;?<i>array-name&nbsp;</i>?&nbsp;?<i>script</i>?
</blockquote>

<p>
The job of the eval method is to execute the SQL statement or statements
given in the second argument.  For example, to create a new table in
a database, you can do this:</p>
︙︙
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For each column in a row of the result, the name of that column
is used as an index in to array.  The value of the column is stored
in the corresponding array entry.  The special array index * is
used to store a list of column names in the order that they appear.
</p>

<p>
If the array variable name is the empty string, then the value of
each column is stored in a variable with the same name as the column
itself.  For example:
</p>

<blockquote>
<b>db1 eval {SELECT * FROM t1 ORDER BY a} {} {<br>
&nbsp;&nbsp;&nbsp;&nbsp;puts "a=$a b=$b"<br>
}</b>
</blockquote>

<p>
From this we get the following output
</p>

<blockquote><b>
a=1 b=hello<br>
a=2 b=goodbye<br>
a=3 b=howdy!</b>
</blockquote>



















}

##############################################################################
METHOD complete {

<p>
The "complete" method takes a string of supposed SQL as its only argument.








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For each column in a row of the result, the name of that column
is used as an index in to array.  The value of the column is stored
in the corresponding array entry.  The special array index * is
used to store a list of column names in the order that they appear.
</p>

<p>
If the array variable name is omitted or is the empty string, then the value of
each column is stored in a variable with the same name as the column
itself.  For example:
</p>

<blockquote>
<b>db1 eval {SELECT * FROM t1 ORDER BY a} {<br>
&nbsp;&nbsp;&nbsp;&nbsp;puts "a=$a b=$b"<br>
}</b>
</blockquote>

<p>
From this we get the following output
</p>

<blockquote><b>
a=1 b=hello<br>
a=2 b=goodbye<br>
a=3 b=howdy!</b>
</blockquote>

<p>
Tcl variable names can appear in the SQL statement of the second argument
in any position where it is legal to put a string or number literal.  The
value of the variable is substituted for the variable name.  If the
variable does not exist a NULL values is used.  For example:
</p>

<blockquote><b>
db1 eval {INSERT INTO t1 VALUES(5,$bigblob)}
</b></blockquote>

<p>
Note that it is not necessary to quote the $bigblob value.  That happens
automatically.  If $bigblob is a large string or binary object, this
technique is not only easier to write, it is also much more efficient
since it avoids making a copy of the content of $bigblob.
</p>

}

##############################################################################
METHOD complete {

<p>
The "complete" method takes a string of supposed SQL as its only argument.
︙︙