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.
pg_select
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
pg_select — 选择记录
说明
pg_select(
PgSql\Connection
string
array
int
int
): array|string|false
PgSql\Connection
$connection,string
$table_name,array
$conditions,int
$flags = PGSQL_DML_EXEC,int
$mode = PGSQL_ASSOC): array|string|false
pg_select() 根据 conditions 数组中的 field=>value 值来选择记录。成功的查询返回和 conditions
指定的条件相匹配的包括记录和字段的数组。
如果设置了 flags，pg_convert() 会按照指定 flag 作用于 conditions 上。
如果设置了 mode，返回值将以数组形式返回，其中使用 PGSQL_NUM
表示索引数组，使用 PGSQL_ASSOC 表示关联数组（默认），或者同时使用 PGSQL_BOTH 表示两者。
默认情况下 pg_select() 传递原始值。值必须转义或指定 PGSQL_DML_ESCAPE。PGSQL_DML_ESCAPE 引用并转义参数/标识符。因此，表/列名称变得区分大小写。
注意转义和预处理查询都不能保护 LIKE 查询、JSON、Array、Regex 等，这些参数要根据上下文来处理。即转义/验证值。
参数
-
connection -
PgSql\Connection 实例。
-
table_name -
要选择记录的表名。
-
conditions -
array，其键是表
table_name中的字段名称，其值是检索记录必须满足的条件。 -
flags -
任意数量的
PGSQL_CONV_FORCE_NULL、PGSQL_DML_NO_CONV、PGSQL_DML_ESCAPE、PGSQL_DML_EXEC、PGSQL_DML_ASYNC或PGSQL_DML_STRING的组合。当PGSQL_DML_STRING是flags的一部分，然后将返回查询字符串。当设置了PGSQL_DML_NO_CONV或PGSQL_DML_ESCAPE时，不会在内部调用 pg_convert()。 -
mode -
PGSQL_ASSOC、PGSQL_NUM或PGSQL_BOTH中的一个。 如果设置了PGSQL_ASSOC，返回值将是关联 array；如果设置了PGSQL_NUM，返回值将是索引 array；如果设置了PGSQL_BOTH，返回值将是同时包含关联和索引的 array。
示例
示例 #1 pg_select() 示例
<?php
$db = pg_connect('dbname=foo');
// 在某种程度上安全，因为所有值都转义了。
// 然而 PostgreSQL 支持 JSON/Array。无论是
// 转义还是预处理都不安全。
$rec = pg_select($db, 'post_log', $_POST, PG_DML_ESCAPE);
if ($rec) {
echo "Records selected\n";
var_dump($rec);
} else {
echo "User must have sent wrong inputs\n";
}
?>
add a note
User Contributed Notes 2 notes
david dot tulloh at infaze dot com dot au ¶
19 years ago
wietse at cj2 dot nl ¶
18 years ago
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] =>
)
)
