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问题:
I am having trouble inserting null values into date fields into a MySQL table.
Here is the insert query:
$query = 'INSERT INTO table (column_s1, column_s2, column_d1, column_d2)
VALUES ("'.$string1.'", "'.$string2.'", '.$date1.', '.$date2.')';
Columns s1 and s2 take string values and d1 and d2 take dates. When I run this query with only the string fields, there is no problem.
The date values can be either set or null, so I have not included the quotation marks in the query, but have instead added them to the variable earlier on. This is the php code I am using to set the date values:
if (empty($date1)){
$date1 = NULL;
}
else{
$date1part = explode("/",$date1);
$date1 = '"'.$date1part[2].'/'.$date1part[1].'/'.$date1part[0].'"';
}
When the date values are all set, the record is inserted correctly. However, when either of the dates is null, nothing is inserted.
Why can't I just insert null values into MySQL like this?
回答1:
Try this:
$query = "INSERT INTO table (column_s1, column_s2, column_d1, column_d2)
VALUES ('$string1', '$string2', " . ($date1==NULL ? "NULL" : "'$date1'") . ", " . ($date2==NULL ? "NULL" : "'$date2'") . ");";
so for example if you put this into query:
$string1 = "s1";
$string2 = "s2";
$date1 = NULL;
$date2 = NULL;
result should be:
INSERT INTO table (column_s1, column_s2, column_d1, column_d2) VALUES ('s1', 's2', NULL, NULL);
回答2:
You should convert the null variable into a NULL string first
Like this:
if(is_null($date1)){
$date1 = 'NULL';
}
If you are using a MySQL date column, you must also specify that it should hold null when creating it, like this:
CREATE TABLE `table` (
id INT NOT NULL AUTO_INCREMENT,
date DATE NULL DEFAULT NULL,
PRIMARY KEY(id)
)
It is also very important that you perform the query with bound parameters, for example using pdo
- http://www.php.net/manual/en/pdo.construct.php
- http://php.net/manual/en/pdo.prepared-statements.php
- How do I insert NULL values using PDO?
Something like this:
$query = 'INSERT INTO table (column_s1, column_s2, column_d1, column_d2)
VALUES (?, ?, ?, ?)';
$stmt = $db->prepare($query);
$stmt->execute(array($string1,$string2,$date1,$date2));
回答3:
Backslash N is another way to express NULL in MySQL.
Try putting the value (backslash N): \N
into one of the parameters like this:
$data1 = "\N";
$sql="insert into tablename set column_s1='" . $data1 .
"', column_s2='" . data2 .
"', column_s3='" . $data3 . "'";
Reference: http://dev.mysql.com/doc/refman/5.1/en/load-data.html
回答4:
In Derby, If you want to insert values except the ones you have declared Null (column_d1, column_d2), sql:
INSERT INTO DB.table (column_s1, column_s2) VALUES ('s1', 's2');
回答5:
Probably answer is unneeded at this moment, but I found solution exactly I have been searching. Use an Expression
to pass NULL
like this:
['some_date_to_update' => new Expression('NULL')]
Hence, MySQL will understand what you want, and save (NULL)
in DB instead of storing 0-dates. Hope this will help somebody.
回答6:
if NULL no work just pass date as "0000-00-00"
$chequeDate = "0000-00-00";
回答7:
In Mysql DATE
data type Default NULL
means
Some version set as 0000-00-00
Some version set as 1970-01-01