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[英]Converting from mysql_query's to prepared statements (mysqli/PDO)? Necessary?
[英]mysql_query to PDO and prepared statements
我在CMS中有這個功能,它將字段和值的變量列表插入到兩個不同的表中; 一個是靜態索引表,一個是動態的。 這是功能:
function insertFields($fields)
{
$stdfields = array();
$extfields = array();
/* Separate the fields based on if the fields is standard or extra. $this->fields is a csv list of the defined extra fields */
foreach($fields as $field => $value)
{
$fields[mysql_real_escape_string($field)] = mysql_real_escape_string($value);
if(strstr($this->fields, $field))
$extfields[$field] = $value;
else
$stdfields[$field] = $value;
}
//Build the 2 queries -- Maybe there is a better way to do this?
$extfieldcount = count($extfields);
$stdfieldcount = count($stdfields);
$stditers = 0;
$extiters = 0;
foreach($extfields as $field => $value)
{
if($extiters != $extfieldcount)
{
$extfields.= $field.", ";
$extvalues.= "'".$value."', ";
}
else
{
$extfields.= $field." ";
$extvalues.= "'".$value."' ";
}
$extiters++;
}
foreach($stdfields as $field => $value)
{
if($stditers != $stdfieldcount)
{
$newfields.= $field.", ";
$newvalues.= "'".$value."', ";
}
else
{
$newfields.= $field." ";
$newvalues.= "'".$value."' ";
}
$stditers++;
}
//Inset the standard fields
$stdquery = "INSERT INTO masteridx (".$newfields.") VALUES (".$newvalues.")";
$this->dbQuery($stdquery);
/* not perfect. I need a better way to find the id that was inserted, so I can combine three queries into at least two */
$findlastquery = "SELECT `id` FROM `masteridx` WHERE `slug`='".$fields['slug']."' LIMIT 1";
$result = $this->dbQuery($findlastquery);
$result = mysql_fetch_assoc($result);
$tempfield = "id, ";
$tempvalue = "'".$result['id']."', ";
//Insert the extra fields
$extquery = "INSERT INTO ".$this->type." (".$tempfield.$extfields.") VALUES (".$tempvalue.$extvalues.")";
$this->dbQuery($extquery);
}
所以對於准備好的聲明,我不能綁定字段,只是綁定值,對吧? 如果我做了類似的事情,我仍然要逃離田地:
for ($i = 0; $i <= $stdfieldcount; $i++)
{
if($i < $stdfieldcount)
$qs.= '?, ';
else
$qs.= '? ';
}
$sth = $dbh->prepare("INSERT INTO masteridx ({$stdfields}) VALUES ({$qs})");
$sth->execute($array_of_stdfield_values);
如果我還要逃離田野,這里有什么意義呢? 此函數最終將采用多個文章及其字段的數組。 字段本身每次都會有所不同。我想當我第一次看到預處理語句時,我可以只提供一個字段數組和一組值,但我想情況並非如此。
我的問題是,你們將如何實現這一目標? 我想開始與數據庫無關,而PDO看起來是一個很好的方法。
PHP提供了許多便利功能,可以完成你手工完成的很多工作。
join()
函數對於構建以逗號分隔的列表非常有用。 示例(未測試):
function insertFields($fields) {
$columns = join(",", array_map(
function($col) { return "`".preg_replace("/`/gu","``",$col)."`"},
array_keys($fields)));
$params = join(",", array_map(
function($col) { return ":".preg_replace("/[`\s]/gu","",$col)},
array_keys($fields)));
$stdquery = "INSERT INTO masteridx ({$columns}) VALUES ({$params})";
$stmt = $pdo->prepare($stdQuery);
$stmt->execute($fields);
}
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