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https://github.com/sigmasternchen/php-doc-en
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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@180481 c90b9560-bf6c-de11-be94-00142212c4b1
396 lines
11 KiB
XML
396 lines
11 KiB
XML
<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.10 $ -->
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<section id="ifx.configuration">
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&reftitle.runtime;
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&extension.runtime;
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<note>
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<para>
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Make sure that the Informix environment variables INFORMIXDIR and
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INFORMIXSERVER are available to the PHP ifx driver, and that the
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INFORMIX bin directory is in the PATH. Check this by running a
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script that contains a call to <function>phpinfo</function>
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before you start testing. The <function>phpinfo</function>
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output should list these environment variables. This is true for
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both CGI php and Apache mod_php. You may have to set these
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environment variables in your Apache startup script.
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</para>
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<para>
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The Informix shared libraries should also be available to the
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loader (check LD_LIBRARY_PATH or ld.so.conf/ldconfig).
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</para>
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</note>
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<note>
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<title>
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Some notes on the use of BLOBs (TEXT and BYTE columns)
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</title>
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<para>
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BLOBs are normally addressed by BLOB identifiers. Select queries
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return a "blob id" for every BYTE and TEXT column. You can get
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at the contents with "string_var = ifx_get_blob($blob_id);" if
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you choose to get the BLOBs in memory (with:
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"ifx_blobinfile(0);"). If you prefer to receive the content of
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BLOB columns in a file, use "ifx_blobinfile(1);", and
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"ifx_get_blob($blob_id);" will get you the filename. Use normal
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file I/O to get at the blob contents.
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</para>
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<para>
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For insert/update queries you must create these "blob id's"
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yourself with "<function>ifx_create_blob</function>;". You then
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plug the blob id's into an array, and replace the blob columns
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with a question mark (?) in the query string. For
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updates/inserts, you are responsible for setting the blob
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contents with <function>ifx_update_blob</function>.
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</para>
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<para>
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The behaviour of BLOB columns can be altered by configuration
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variables that also can be set at runtime:
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</para>
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<para>
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configuration variable: ifx.textasvarchar
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</para>
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<para>
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configuration variable: ifx.byteasvarchar
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</para>
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<para>
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runtime functions:
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</para>
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<para>
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ifx_textasvarchar(0): use blob id's for select queries with TEXT
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columns
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</para>
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<para>
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ifx_byteasvarchar(0): use blob id's for select queries with BYTE
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columns
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</para>
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<para>
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ifx_textasvarchar(1): return TEXT columns as if they were
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VARCHAR columns, so that you don't need to use blob id's for
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select queries.
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</para>
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<para>
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ifx_byteasvarchar(1): return BYTE columns as if they were
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VARCHAR columns, so that you don't need to use blob id's for
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select queries.
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</para>
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<para>
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configuration variable: ifx.blobinfile
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</para>
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<para>
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runtime function:
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</para>
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<para>
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ifx_blobinfile_mode(0): return BYTE columns in memory, the blob
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id lets you get at the contents.
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</para>
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<para>
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ifx_blobinfile_mode(1): return BYTE columns in a file, the blob
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id lets you get at the file name.
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</para>
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<para>
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If you set ifx_text/byteasvarchar to 1, you can use TEXT and BYTE
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columns in select queries just like normal (but rather long)
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VARCHAR fields. Since all strings are "counted" in PHP, this
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remains "binary safe". It is up to you to handle this
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correctly. The returned data can contain anything, you are
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responsible for the contents.
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</para>
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<para>
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If you set ifx_blobinfile to 1, use the file name returned by
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ifx_get_blob(..) to get at the blob contents. Note that in this
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case YOU ARE RESPONSIBLE FOR DELETING THE TEMPORARY FILES CREATED
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BY INFORMIX when fetching the row. Every new row fetched will
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create new temporary files for every BYTE column.
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</para>
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<para>
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The location of the temporary files can be influenced by the
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environment variable "blobdir", default is "." (the current
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directory). Something like: putenv(blobdir=tmpblob"); will ease
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the cleaning up of temp files accidentally left behind (their
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names all start with "blb").
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</para>
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</note>
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<note>
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<title>Automatically trimming "char" (SQLCHAR and SQLNCHAR) data</title>
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<para>
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This can be set with the configuration variable
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</para>
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<para>
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ifx.charasvarchar: if set to 1 trailing spaces will be
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automatically trimmed, to save you some "chopping".
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</para>
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</note>
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<note>
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<title>&null; values</title>
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<para>
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The configuration variable ifx.nullformat (and the runtime
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function <function>ifx_nullformat</function>) when set to &true;
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will return &null; columns as the string "&null;", when set to &false;
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they return the empty string. This allows you to discriminate
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between &null; columns and empty columns.
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</para>
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</note>
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<para>
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<table>
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<title>Informix configuration options</title>
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<tgroup cols="4">
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<thead>
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<row>
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<entry>Name</entry>
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<entry>Default</entry>
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<entry>Changeable</entry>
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<entry>Changelog</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry>ifx.allow_persistent</entry>
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<entry>"1"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.max_persistent</entry>
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<entry>"-1"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.max_links</entry>
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<entry>"-1"</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.default_host</entry>
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<entry>NULL</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.default_user</entry>
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<entry>NULL</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.default_password</entry>
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<entry>NULL</entry>
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<entry>PHP_INI_SYSTEM</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.blobinfile</entry>
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<entry>"1"</entry>
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<entry>PHP_INI_ALL</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.textasvarchar</entry>
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<entry>"0"</entry>
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<entry>PHP_INI_ALL</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.byteasvarchar</entry>
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<entry>"0"</entry>
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<entry>PHP_INI_ALL</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.charasvarchar</entry>
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<entry>"0"</entry>
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<entry>PHP_INI_ALL</entry>
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<entry></entry>
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</row>
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<row>
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<entry>ifx.nullformat</entry>
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<entry>"0"</entry>
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<entry>PHP_INI_ALL</entry>
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<entry></entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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&ini.php.constants;
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</para>
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&ini.descriptions.title;
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<para>
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<variablelist>
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<varlistentry id="ini.ifx.allow-persistent">
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<term>
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<parameter>ifx.allow_persistent</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Whether to allow persistent Informix connections.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.max-persistent">
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<term>
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<parameter>ifx.max_persistent</parameter>
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<type>integer</type>
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</term>
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<listitem>
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<para>
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The maximum number of persistent Informix connections per
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process.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.max-links">
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<term>
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<parameter>ifx.max_links</parameter>
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<type>integer</type>
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</term>
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<listitem>
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<para>
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The maximum number of Informix connections per process, including
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persistent connections.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.default-host">
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<term>
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<parameter>ifx.default_host</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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The default host to connect to when no host is specified
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in <function>ifx_connect</function> or
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<function>ifx_pconnect</function>. Doesn't apply in
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&safemode;.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.default-user">
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<term>
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<parameter>ifx.default_user</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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The default user id to use when none is specified
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in <function>ifx_connect</function> or
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<function>ifx_pconnect</function>. Doesn't apply in
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&safemode;.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.default-password">
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<term>
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<parameter>ifx.default_password</parameter>
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<type>string</type>
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</term>
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<listitem>
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<para>
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The default password to use when none is specified
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in <function>ifx_connect</function> or
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<function>ifx_pconnect</function>. Doesn't apply in
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&safemode;.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.blobinfile">
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<term>
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<parameter>ifx.blobinfile</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Set to &true; if you want to return blob columns
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in a file, &false; if you want them in memory. You can
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override the setting at runtime
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with <function>ifx_blobinfile_mode</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.textasvarchar">
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<term>
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<parameter>ifx.textasvarchar</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Set to &true; if you want to return TEXT columns
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as normal strings in select statements,
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&false; if you want to use blob id parameters. You can
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override the setting at runtime with
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<function>ifx_textasvarchar</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.byteasvarchar">
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<term>
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<parameter>ifx.byteasvarchar</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Set to &true; if you want to return BYTE columns
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as normal strings in select queries,
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&false; if you want to use blob id parameters. You can
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override the setting at runtime with
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<function>ifx_textasvarchar</function>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.charasvarchar">
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<term>
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<parameter>ifx.charasvarchar</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Set to &true; if you want to trim trailing spaces
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from CHAR columns when fetching them.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry id="ini.ifx.nullformat">
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<term>
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<parameter>ifx.nullformat</parameter>
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<type>boolean</type>
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</term>
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<listitem>
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<para>
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Set to &true; if you want to return &null; columns
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as the literal string "&null;", &false; if you want
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them returned as the empty string "". You can
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override this setting at runtime with
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<function>ifx_nullformat</function>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</para>
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</section>
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<!-- Keep this comment at the end of the file
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Local variables:
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mode: sgml
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sgml-omittag:t
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sgml-shorttag:t
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sgml-minimize-attributes:nil
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sgml-always-quote-attributes:t
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sgml-indent-step:1
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sgml-indent-data:t
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indent-tabs-mode:nil
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sgml-parent-document:nil
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sgml-default-dtd-file:"../../../manual.ced"
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sgml-exposed-tags:nil
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sgml-local-catalogs:nil
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sgml-local-ecat-files:nil
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End:
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vim600: syn=xml fen fdm=syntax fdl=2 si
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vim: et tw=78 syn=sgml
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vi: ts=1 sw=1
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-->
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