Rechercher dans le manuel MySQL

Displaying 281 to 290 of 548 total results
https://dev.mysql.com/mysql-cluster-ndbd-definition.html
Consider this table definition: CREATE TABLE example ( a INT NOT NULL, b INT NOT NULL, c INT NOT NULL, PRIMARY KEY(a), UNIQUE(b) ) ENGINE=NDBCLUSTER; For each record, there are 12 bytes of data plus 12 bytes overhead. The [ndbd] and [ndbd default] ...
https://dev.mysql.com/mysql-cluster-programs-ndb-import.html
--output-type=name Property Value Command-Line Format --output-type=name Type Enumeration Default Value ndb Valid Values null Set the output type. ndb_import imports CSV-formatted data, such as that produced by mysqldump --tab, directly into NDB ...
https://dev.mysql.com/mysql-cluster-programs-ndb-select-all.html
ndb_select_all prints all rows from an NDB table to stdout. Usage ndb_select_all -c connection_string tbl_name -d db_name [> file_name] The following table includes options that are specific to the NDB Cluster native backup restoration program ...
https://dev.mysql.com/mysql-fetch-field.html
For metadata-optional connections, this function returns NULL when the resultset_metadata system variable is set to NONE. NULL if no columns are left or the result set has no metadata. MYSQL_FIELD *mysql_fetch_field(MYSQL_RES *result) Returns the ...
https://dev.mysql.com/mysql-info.html
String format: Records: 3 Duplicates: 0 Warnings: 0 LOAD DATA String format: Records: 1 Deleted: 0 Skipped: 0 Warnings: 0 ALTER TABLE String format: Records: 3 Duplicates: 0 Warnings: 0 UPDATE String format: Rows matched: 40 Changed: 40 Warnings: 0 ... const char *mysql_info(MYSQL *mysql) Retrieves a string providing information about the most recently executed statement, but only for the statements listed ...
https://dev.mysql.com/mysql-init.html
If mysql is a NULL pointer, the function allocates, initializes, and returns a new object. NULL if there was insufficient memory to allocate a new object. MYSQL *mysql_init(MYSQL *mysql) Allocates or initializes a MYSQL object suitable for ...
https://dev.mysql.com/mysql-logging.html
Then use either of the following techniques to prevent it from being created again: Set the MYSQL_HISTFILE environment variable to /dev/null. Create .mysql_history as a symbolic link to /dev/null; this need be done only once: shell> ln -s /dev/null ... The mysql client can do these types of logging for statements executed interactively: On Unix, mysql writes the statements to a history ...
https://dev.mysql.com/mysql-shell-tutorial-javascript-indexes-create.html
The last parameter indicates whether the field should require the NOT NULL constraint. If the value is false, the field can contain NULL values. In the following example, "Text(40)" represents the number of characters to index and true indicates ...
https://dev.mysql.com/mysql-shell-tutorial-javascript-table-insert.html
values(null, "Olympia", "USA", "Washington", '{"Population": 5000}') Query OK, 1 item affected (0.01 sec) The city table has five columns: ID, Name, CountryCode, District, and Info. values(null, "Little Falls", "USA").values(null, "Happy Valley", ...
https://dev.mysql.com/mysql-shell-tutorial-python-documents-in-tables.html
In MySQL, a table may contain traditional relational data, JSON values, or both. You can combine traditional data with JSON documents by storing the documents in columns having a native JSON data type. Examples in this section use the city table in ...
Displaying 281 to 290 of 548 total results

Find a PHP function

Document created the 26/06/2006, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/mysql-rf-fct-null-p-29.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:en Manuel MySQL : https://dev.mysql.com/

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author This site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.

Contents Haut