PHP 8.3.4 Released!

pg_copy_from

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_copy_from 将数组中的记录插入到表

说明

pg_copy_from(
    PgSql\Connection $connection,
    string $table_name,
    array $rows,
    string $separator = "\t",
    string $null_as = "\\\\N"
): bool

pg_copy_from()rows 插入记录到表中。在内部发出 COPY FROM 命令以插入记录。

参数

connection

PgSql\Connection 实例。

table_name

复制 rows 到其中的表名。

rows

要复制 array 中的数据到 table_namerows 中的每个值都成为 table_name 中的一行。rows 中的每个值都应该用字符串分割以插入到每个字段。值应该换行终止。

separator

rows 的每个元素分割为每个字段的值的标记。默认为 \t

null_as

SQL NULL 值在 rows 中的表示方式。默认为 \\N"\\\\N")。

返回值

成功时返回 true, 或者在失败时返回 false

更新日志

版本 说明
8.1.0 现在 connection 参数接受 PgSql\Connection 实例,之前接受 resource

示例

示例 #1 pg_copy_from() 示例

<?php
$db
= pg_connect("dbname=publisher") or die("Could not connect");

$rows = pg_copy_to($db, $table_name);

pg_query($db, "DELETE FROM $table_name");

pg_copy_from($db, $table_name, $rows);
?>

参见

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User Contributed Notes 10 notes

up
7
karlo dot petravic at hotmail dot com
4 years ago
As table name you can also specify columns you want imported.

Will import all columns:
<?php
pg_copy_from
($db, 'cpm.ics', $rows);
?>

Will import only specified columns:
<?php
pg_copy_from
($db, 'cpm.ics (type, product, date, count, amount)', $rows);
?>
up
1
Rainer Perske
1 year ago
To solve the problem of how many backslashes to use for the parameters $separator and $null_as: The backslashes are interpreted twice, first by PHP and then by PostgreSQL. So write four backslashes to indicate one backslash in the input data. So both '\\\\N' and as "\\\\N" become NULL AS E'\\N' meaning the same as NULL AS '\N' in the internally used SQL statement.

The loaded input data must be backslash-escaped. According to the PostgreSQL documentation, you can use the following escape sequences:

\\ = Backslash (ASCII 92)
\b = Backspace (ASCII 8)
\t = Tab (ASCII 9)
\n = Newline (ASCII 10)
\v = Vertical tab (ASCII 11)
\f = Form feed (ASCII 12)
\r = Carriage return (ASCII 13)
\000 (Backslash followed by one to three octal digits) = the byte with that numeric code
\x00 (Backslash x followed by one or two hex digits) = the byte with that numeric code

With the default setting, a data field containing only \N (one non-escaped backslash and an N) indicates a NULL value. This default value \N has been chosen because it does not collide with properly encoded data.
up
1
smcbride at msn dot com
3 years ago
When using this function, don't get bit by the double quote (") vs. single quote (') differences. It is a small thing, but the error messaging is misleading. If you use a single quote, you will see the \t separated values all try to be inserted into the first field.

Small consideration, but will save someone who is working late and can't get these functions to work.
up
1
Anonymous
14 years ago
see also: pg_put_line for a solution that does not require buffering of all the data to be copied,
up
0
Dave
10 years ago
Default is "\\\N" not "\\N" at least in php 5.4

pg_copy_from($db, $table_name, "\t", "\\\N")
up
0
vlad at php dot net
20 years ago
By default NULL values are a backslash followed with capital N ("\\N").

Also, you can't insert entries with OIDs (I've added it to my TODO list though)
up
-1
Dave
12 years ago
As of postgresql 9.1 "standard_conforming_strings" is set to on

This will not work anymore
<?php
$copy_message
= "1\t\\N\t300";
pg_copy_from($db, "message", $copy_message);
?>
result will be a "N" in that field. if the field allow text that is else it will fail to insert the post.

simple fix
<?php
$copy_message
= "1\t\\NULL\t300";
pg_copy_from($db, "message", $copy_message, "\t","\\NULL");
?>
up
-1
kapouer_php at melix dot org
16 years ago
pg syntax is :
COPY test (cola, colb, colc) FROM stdin;
...

this function doesn't let you in which order the columns are !
up
-1
carl at thep.lu.se
21 years ago
Something needs to be said about the format of the array.
Judging by what I've seen, it's pretty much what you get
from loading a tab-separated file with file(). That is, the
lines are linefeed-terminated and there's no need to have
an extra line with "\.". On the other hand, when I try using this
command the connection to the server ends up in some odd
state and is then lost:
PHP Warning: U?S?o() query failed: server closed the connection unexpectedly

I think it might be safer to use the lower-level function
pg_put_line() for now.
up
-9
Dave
13 years ago
Fix for "Copy command failed: ERROR: literal carriage return
found in data" or
"Copy command failed: ERROR: missing data for column
"message" CONTEXT: COPY message, line 1:"

<?php
$message
= "HEJ\rHEJ\nHEJ\r\nHEJ\n\rHEJ\tHELLO\\";

$message = addslashes($message);

$message = str_replace(
array(
"\n","\r","\t"),
array(
"\\n","\\r","\\t"),
$message);

$copy_message = "1\t". $message ."\t300";

pg_copy_from($db, "message", $copy_message);
?>
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