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mysql_real_connect(3) MariaDB Connector/C mysql_real_connect(3)
Name
mysql_real_connect - establishes a connection to a MariaDB database
server
Synopsis
MYSQL * mysql_real_connect(MYSQL *mysql,
const char *host,
const char *user,
const char *passwd,
const char *db,
unsigned int port,
const char *unix_socket,
unsigned long flags);
Description
Establishes a connection to a database server.
Parameter
• mysql - a mysql handle, which was previously allocated by
mysql_init(3)
• host - can be either a host name or an IP address. Passing the NULL
value or the string "localhost" to this parameter, the local host is
assumed. When possible, pipes will be used instead of the TCP/IP
protocol. Since version 3.3.0 it is also possible to provide a comma
separated list of hosts for simple fail over in case of one or more
hosts are not available.
• user - the user name. If NULL or an empty string "" is specified,
the current user will be used.
• passwd - If provided or NULL, the server will attempt to authenticate
the user against those user records which have no password only.
This allows one username to be used with different permissions (de-
pending on if a password as provided or not).
• db - if provided will specify the default database to be used when
performing queries.
• port - specifies the port number to attempt to connect to the server.
• unix_socket - specifies the socket or named pipe that should be used.
• flags - the flags allows various connection options to be set
Flag Description
--------------------------------------------------------------------------
CLIENT_FOUND_ROWS Return the number of matched rows
instead of number of changed rows.
CLIENT_NO_SCHEMA Forbids the use of database.table-
name.column syntax and forces the
SQL parser to generate an error.
CLIENT_COMPRESS Use compression protocol
CLIENT_IGNORE_SPACE Allows spaces after function names.
All function names will become re-
served words.
CLIENT_LOCAL_FILES Allows LOAD DATA LOCAL statements
CLIENT_MULTI_STATEMENTS Allows the client to send multiple
statements in one command. State-
ments will be divided by a semi-
colon.
CLIENT_MULTI_RESULTS Indicates that the client is able
to handle multiple result sets from
stored procedures or multi state-
ments. This option will be auto-
matically set if
CLIENT_MULTI_STATEMENTS is set.
CLIENT_REMEMBER_OPTIONS Remembers options passed to
mysql_optionsv(3) if a connect at-
tempt failed. If MYSQL_OPTIONS_RE-
CONNECT option was set to true, op-
tions will be saved and used for
reconnection.
Return value
returns a connection handle (same as passed for 1st parameter) or NULL
on error. On error, please check mysql_errno(3) and mysql_error(3)
functions for more information.
Notes
• The password doesn't need to be encrypted before executing
mysql_real_connect(). This will be handled in the client server pro-
tocol.
• The connection handle can't be reused for establishing a new connec-
tion. It must be closed and reinitialized before.
• mysql_real_connect() must complete successfully before you can exe-
cute any other API functions beside mysql_optionsv(3).
• host parameter may contain multiple host/port combinations (supported
since version 3.3.0). The following syntax is required:
• hostname and port must be separated by a colon (:)
• IPv6 addresses must be enclosed within square brackets
• hostname:port pairs must be be separated by a comma (,)
• if only one host:port was specified, the host string needs to end
with a comma.
• if no port was specified, the default port will be used.
Examples for failover host string:
host=[::1]:3306,192.168.0.1:3306,test.example.com
host=127.0.0.1:3306,
See also
• mysql_init(3)
• mysql_close(3)
• mariadb_reconnect(3)
• mysql_error(3)
• mysql_errno(3)
Version 3.4 mysql_real_connect(3)
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