This function cannot be used to insert a record with only default values - i.e. with an assoc_array of array()
(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
pg_insert — 将数组插入到表中
$connection
, string $table_name
, array $assoc_array
, int $options = PGSQL_DML_EXEC
) : mixed
pg_insert() 将 assoc_array 数组中的值插入到由
table_name 指定的表中。
如果给出了参数
options ，则函数 pg_convert()
会按照给定选项被作用到 assoc_array 上
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。
connectionPostgreSQL database connection resource.
table_name
Name of the table into which to insert rows. table_name
中的列必须至少要有 assoc_array
中的单元那么多。
assoc_array
table_name
中的字段名以及字段值必须和 array 参数
中的键名及值匹配。
options
Any number of PGSQL_CONV_OPTS,
PGSQL_DML_NO_CONV,
PGSQL_DML_EXEC,
PGSQL_DML_ASYNC or
PGSQL_DML_STRING combined. If PGSQL_DML_STRING is part of the
options then query string is returned.
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.
Example #1 pg_insert() example
<?php
$dbconn = pg_connect('dbname=foo');
// This is safe, since $_POST is converted automatically
$res = pg_insert($dbconn, 'post_log', $_POST);
if ($res) {
echo "POST data is successfully logged\n";
} else {
echo "User must have sent wrong inputs\n";
}
?>
This function cannot be used to insert a record with only default values - i.e. with an assoc_array of array()
it seems to fail silently if you try to insert somehting with a mis-named column
If you need schema support, this function will do something similar to pg_insert:
function pg_insert_with_schema($connection, $table, $updates)
{
$schema = 'public';
if (strpos($table, '.') !== false)
list($schema, $table) = explode('.', $table);
if (count($updates) == 0) {
$sql = "INSERT INTO $schema.\"$table\" DEFAULT VALUES";
return pg_query($sql);
} else {
$sql = "INSERT INTO $schema.\"$table\" ";
$sql .= '("';
$sql .= join('", "', array_keys($updates));
$sql .= '")';
$sql .= ' values (';
for($i = 0; $i < count($updates); $i++)
$sql .= ($i != 0? ', ':'').'$'.($i+1);
$sql .= ')';
return pg_query_params($connection, $sql, array_values($updates));
}
}
Today at work I isolated a problem I was having with this function to how I was formatting the date. I was assigning the date in my code as follows:
$today = date( "Ymd" ); // ISO 8601
This format is acceptable to PostgreSQL, as verified by their documentation and buy tests using psql. However, to make it work in my code, I had to make the following change:
$today = date( "Y-m-d" ); // also ISO 8601 format
Had a few issues while trying to run this in PHP 4.4.0:
- I could not get it to work with column names that are SQL reserved words (example: desc, order). I was forced to change the column names in order to use the function. I could not put the column names in quotes, because that caused pg_convert() to fail.
- Function was returning false until I passed the PGSQL_DML_EXEC option.
Beware of the following: pg_insert() and pg_update() are adding slashes to all character-like fields they work with. This makes them SQL injection super-safe, but there are unwanted consequences, as follows:
If you have a regular setup with magic_quotes_gcp=On, and you use pg_insert() or pg_update(), you will end up with fields that look as if you used addslashes() twice. To solve this, you can use stripslashes() on the data just before using it with pg_insert() or pg_update().
There's another alternative, which seems better to me. Why make yourself crazy all over the code, adding slashes, stripping slashes, worrying whether magic_quotes_gpc is on or off and so on and so forth? Why do this, when the only place you actually need those slashes is right when you push the data into the database?
So why not get rid of your addslashes() and stripslashes() from all over your code, and turn magic_quotes_gcp off. As long as you always use pg_insert() and pg_update() to do your DB work, you're SQL-injection safe AND slash-headache free.
Next version :) My version checks whether value is bool, null, string or numeric and if one of the values is not function returns false if not. null values are inserted as NULL, bool as true or false and strings are add-shlashed before adding to query string. Note, that this function is not safe. SQL injection is possible with column names if you use $_POST or something similar as a $array.
<?php
function db_build_insert($table, $array) {
if (count($array)===0) return false;
$columns = array_keys($array);
$values = array_values($array);
unset($array);
for ($i = 0, $c = count($values); $i$c; ++$i) {
if (is_bool($values[$i])) {
$values[$i] = $values[$i]?'true':'false';
} elseif (is_null($values[$i])) {
$values[$i] = 'NULL';
} elseif (is_string($values[$i])) {
$values[$i] = "'" . addslashes($values[$i]) . "'";
} elseif (!is_numeric($values[$i])) {
return false;
}
}
return "INSERT INTO $table ($column_quote" . implode(', ', $columns) .
") VALUES (" . implode(', ', $values) . ")";
}
?>
Returns SQL statement, slight improvement on the code from 'rorezende at hotmail dot com'. This version adds bool values correctly.It also checks to make sure there is actually a value in the array before including it in the sql statement. (ie: null values or empty strings won't be added to the sql statement)
<?PHP
function db_build_insert($table,$array)
{
$str = "insert into $table ";
$strn = "(";
$strv = " VALUES (";
while(list($name,$value) = each($array)) {
if(is_bool($value)) {
$strn .= "$name,";
$strv .= ($value ? "true":"false") . ",";
continue;
};
if(is_string($value)) {
$strn .= "$name,";
$strv .= "'$value',";
continue;
}
if (!is_null($value) and ($value != "")) {
$strn .= "$name,";
$strv .= "$value,";
continue;
}
}
$strn[strlen($strn)-1] = ')';
$strv[strlen($strv)-1] = ')';
$str .= $strn . $strv;
return $str;
}
?>
Time is money, then I write a function similar to pg_insert in PHP (only output sql statement) :
function db_mount_insert($table,$array) {
$str = "insert into $table (";
while(list($name,$value) = each($array)) {
$str .= "$name,";
}
$str[strlen($str)-1] = ')';
$str .= " values (";
reset($array);
while(list($name,$value) = each($array)) {
if(is_string($value))
$str .= "'$value',";
else
$str .= "$value,";
}
$str[strlen($str)-1] = ')';
$str .= ";" ;
return $str;
}