The basic structure of inserting data using wpdb->insert() includes: 1. Use global $wpdb to obtain database objects; 2. Splice prefixed table names; 3. Call the insert() method to pass in table names, field values arrays and format arrays. Frequently asked questions and solutions: 1. If the table name is not prefixed, it will fail. You should use $wpdb->prefix splicing; 2. If the data type mismatch causes an exception, you need to ensure that the format character is consistent with the field type; 3. If you forget to call $wpdb globally, you should use a global declaration inside the function. In the example, the user input is cleaned up by sanitize_text_field() and sanitize_textarea_field(), and the timestamp is generated with current_time(), and finally the data is safely inserted into the messages table using the %s format.
In WordPress development, if you need to directly manipulate the database to insert data, the wpdb class is your most commonly used tool. It provides a safe and convenient way to execute SQL queries, where insert() method can be used to add new data to the database table.
Basic structure of inserting data using wpdb->insert()
WordPress's wpdb class encapsulates database operations, and using insert() is one of the recommended ways because it can automatically handle field values escaping and SQL injection protection.
The basic syntax is as follows:
global $wpdb;
$table_name = $wpdb->prefix . 'your_table'; // Note that prefix $wpdb->insert(
$table_name,
array(
'column1' => 'value1',
'column2' => 'value2',
),
array(
'%s', // Corresponding to string type '%d', // Corresponding to integer type)
);- The first parameter is the target table name.
- The second parameter is the associative array of field names and corresponding values.
- The third parameter is the formatting array, which specifies the data type for each value:
-
%drepresents an integer (integer) -
%frepresents a float -
%smeans string
-
If the third parameter is omitted, all values will be treated as strings by default, but for rigor, it is recommended to write the format explicitly.
Frequently Asked Questions and Solutions when Inserting Data
1. The table name is not prefixed, resulting in the insertion failure
WordPress will add $wpdb->prefix to each custom table by default, such as wp_ . If you create your own table, remember to splice the table name with this variable, otherwise you may insert the wrong table or report an error.
$wpdb->prefix . 'my_custom_table'
2. Unexpected results caused by mismatch in data types
For example, inserting a string into an integer field will not directly report an error, but it may cause the data to be wrongly stored as 0 or other outliers. So be sure to make sure the formatter and field types are consistent.
3. No global call to $wpdb
Don't forget to use global $wpdb; otherwise, it will prompt that the object cannot be found.
Example: Insert user-submitted information into a custom table
Suppose you are making a simple message plugin, and the front-end submits the username and message content, you can handle it like this:
if (isset($_POST['submit'])) {
global $wpdb;
$table_name = $wpdb->prefix . 'messages';
$name = sanitize_text_field($_POST['name']);
$message = sanitize_textarea_field($_POST['message']);
$wpdb->insert(
$table_name,
array(
'name' => $name,
'message' => $message,
'created_at' => current_time('mysql'),
),
array(
'%s',
'%s',
'%s',
)
);
}Here are a few helper functions:
-
sanitize_text_field(): Clean the input text -
sanitize_textarea_field(): Clean up multiple lines of text -
current_time('mysql'): Get the current time and format it into a time format acceptable to MySQL
Basically that's it. By mastering the usage of wpdb->insert() and combining with the appropriate checksum cleaning function, you can safely store the data into the database.
The above is the detailed content of How to insert data using wpdb. For more information, please follow other related articles on the PHP Chinese website!
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