78 lines
2.8 KiB
PHP
78 lines
2.8 KiB
PHP
<?php ?>
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<ul>
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<li \>The <i>CONCAT</i> function returns a string that is a concatenation of its arguments. In the example above we
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map the concatenation of users firstname and lastname to a value called name
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<br \><br \><?php
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renderCode("<?php
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\$q = new Doctrine_Query();
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\$users = \$q->select('CONCAT(u.firstname, u.lastname) name')->from('User u')->execute();
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foreach(\$users as \$user) {
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// here 'name' is not a property of \$user,
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// its a mapped function value
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print \$user->name;
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}
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?>");
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?>
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<br \><br \>
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<li \>The second and third arguments of the <i>SUBSTRING</i> function denote the starting position and length of
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the substring to be returned. These arguments are integers. The first position of a string is denoted by 1.
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The <i>SUBSTRING</i> function returns a string.
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<br \><br \><?php
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renderCode("<?php
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\$q = new Doctrine_Query();
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\$users = \$q->select('u.name')->from('User u')->where(\"SUBSTRING(u.name, 0, 1) = 'z'\")->execute();
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foreach(\$users as \$user) {
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print \$user->name;
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}
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?>");
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?>
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<br \><br \>
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<li \>The <i>TRIM</i> function trims the specified character from a string. If the character to be trimmed is not
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specified, it is assumed to be space (or blank). The optional trim_character is a single-character string
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literal or a character-valued input parameter (i.e., char or Character)[30]. If a trim specification is
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not provided, BOTH is assumed. The <i>TRIM</i> function returns the trimmed string.
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<br \><br \><?php
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renderCode("<?php
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\$q = new Doctrine_Query();
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\$users = \$q->select('u.name')->from('User u')->where(\"TRIM(u.name) = 'Someone'\")->execute();
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foreach(\$users as \$user) {
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print \$user->name;
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}
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?>");
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?> <br \><br \>
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<li \>The <i>LOWER</i> and <i>UPPER</i> functions convert a string to lower and upper case, respectively. They return a
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string. <br \><br \>
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<?php
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renderCode("<?php
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\$q = new Doctrine_Query();
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\$users = \$q->select('u.name')->from('User u')->where(\"LOWER(u.name) = 'someone'\")->execute();
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foreach(\$users as \$user) {
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print \$user->name;
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}
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?>");
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?> <br \><br \>
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<li \>
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The <i>LOCATE</i> function returns the position of a given string within a string, starting the search at a specified
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position. It returns the first position at which the string was found as an integer. The first argument
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is the string to be located; the second argument is the string to be searched; the optional third argument
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is an integer that represents the string position at which the search is started (by default, the beginning of
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the string to be searched). The first position in a string is denoted by 1. If the string is not found, 0 is
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returned.
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<br \><br \>
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<li \>The <i>LENGTH</i> function returns the length of the string in characters as an integer.
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</ul>
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