Quotes an identifier such as a table or field name.

Escapes an identifier value without adding the surrounding quotes.

Returns the raw version string of the database server.

Filters the custom data to log alongside a query.

Adds a placeholder escape string, to escape anything that resembles a printf() placeholder.

Removes the placeholder escape strings from a query.

Parses the DB_HOST setting to interpret it for mysqli_real_connect().

Generates and returns a placeholder escape string for use in queries returned by ::prepare().

Determines the best charset and collation to use given a charset and collation.

Closes the current database connection.

Retrieves the maximum string length allowed in a given column.

For string fields, records the maximum string length that field can safely save.

Strips any invalid characters from the string for a given table and column.

Finds the first table name referenced in a query.

Checks if a string is ASCII.

Checks if the query is accessing a collation considered safe.

Strips any invalid characters based on value/charset pairs.

Strips any invalid characters from the query.

Retrieves the character set for the given table.

Filters the table charset value before the DB is checked.

Retrieves the character set for the given column.

Filters the column charset value before the DB is checked.

Processes arrays of field/value pairs and field formats.

Prepares arrays of value/format pairs as passed to wpdb CRUD methods.

Adds field charsets to field/value/format arrays generated by wpdb::process_field_formats().

First half of escaping for `LIKE` special characters `%` and `_` before preparing for SQL.

Determines whether the database or WPDB supports a particular feature.

Retrieves a comma-separated list of the names of the functions that called wpdb.

Retrieves the database server version number.