pg_select()
(PHP 4 >= 4.3.0, PHP 5, PHP 7)
选择记录
说明
pg_select(resource $connection,string $table_name,array $assoc_array[,int $options= PGSQL_DML_EXEC]): mixed
pg_select()根据assoc_array数组中的field=>value值来选择记录。成功的查询返回和assoc_array指定的条件相匹配的包括记录和字段的数组。
如果指定了options,pg_convert()会按照指定选项作用于assoc_array之上。
Warning此函数是实验性的。此函数的表象,包括名称及其相关文档都可能在未来的PHP 发布版本中未通知就被修改。使用本函数风险自担。
参数
- $connection
PostgreSQL 数据库连接资源。
- $table_name
Name of the table from which to select rows.
- $assoc_array
An array whose keys are field names in the table$table_name, and whose values are the conditions that a row must meet to be retrieved.
- $options
Any number of
PGSQL_CONV_FORCE_NULL
,PGSQL_DML_NO_CONV
,PGSQL_DML_EXEC
,PGSQL_DML_ASYNC
orPGSQL_DML_STRING
combined. IfPGSQL_DML_STRING
is part of the$optionsthen query string is returned.
返回值
成功时返回TRUE
,或者在失败时返回FALSE
。 Returns string if PGSQL_DML_STRING
is passed via$options.
范例
Example #1 pg_select() example
<?php $db = pg_connect('dbname=foo'); // This is safe, since $_POST is converted automatically $rec = pg_select($db, 'post_log', $_POST); if ($rec) { echo "Records selected\n"; var_dump($rec); } else { echo "User must have sent wrong inputs\n"; } ?>
参见
pg_convert()
将关联的数组值转换为适合 SQL 语句的格式。
Valid options are PGSQL_DML_NO_CONV, PGSQL_DML_EXEC, PGSQL_DMP_ASYNC, PGSQL_DML_STRING (pulled out of source code). This function does not support selecting from multiple tables. You can get around this by setting the PGSQL_DML_NO_CONV option. This prevents the error which occurs when the function tries to convert the condition array. I think it is also important to point out that the table_name field is not safe, particularily with the PGSQL_DML_NO_CONV option. The arguements array field is compulsory, as documented. What isn't so clear is that the array has to actually have some values in it, you can't do a select all. In summary, this function is good for a very small subset of basic queries. If you are after anything more complex you are better off with pg_query.
David mentioned that you can't do a Select all. However, when executing this script: <?php $conn_string = "dbname=mydb"; $db = pg_connect($conn_string); $selectfields = array("imgid" => ""); $records = pg_select($db,"mmsfiles",$selectfields); print_r($records); ?> ...I get this result: Array ( [0] => Array ( [imgid] => 1 [file] => /home/wietse/public_html/mms/images/1.gif [thumb] => ) [1] => Array ( [imgid] => 2 [file] => /home/wietse/public_html/mms/images/2.gif [thumb] => ) [2] => Array ( [imgid] => 3 [file] => /home/wietse/public_html/mms/images/3.gif [thumb] => ) [3] => Array ( [imgid] => 4 [file] => /home/wietse/public_html/mms/images/4.gif [thumb] => ) )