Constants¶

Constants are declared in mariadb.constants module.

For using constants of various types they have to be imported first:

from mariadb.constants import *

CAPABILITY¶

New in version 1.1.4.

MariaDB capability flags.

These flags are used to check the capabilities both of a MariaDB server or the client applicaion.

Capability flags are defined in module mariadb.constants.CAPABILIY

import mariadb
from mariadb.constants import *

# connection parameters
conn_params= {
    "user" : "example_user",
    "password" : "GHbe_Su3B8",
    "host" : "localhost"
}

# Establish a connection
connection= mariadb.connect(**conn_params)

# test if LOAD DATA LOCAL INFILE is supported
if connection.server_capabilities & CAPABILITY.LOCAL_FILES:
    print("Server supports LOCAL INFILE")

Output:

Server supports LOCAL INFILE

CLIENT¶

New in version 1.1.0.

MariaDB capability flags.

These flags are used to check the capabilities both of a MariaDB server or the client applicaion.

Capability flags are defined in module mariadb.constants.CLIENT

Deprecated since version 1.1.4: Use CAPABILITY constants instead

CURSOR¶

New in version 1.1.0.

Cursor constants are used for server side cursors. Currently only read only cursor is supported.

Cursor constants are defined in module mariadb.constants.CURSOR.

CURSOR.NONE¶: This is the default setting (no cursor)

CURSOR.READ_ONLY¶: Will create a server side read only cursor. The cursor is a forward cursor, which means it is not possible to scroll back.

ERR (Error)¶

New in version 1.1.2.

Using ERR constants instead of error numbers make the code more readable. Error constants are defined in constants.ERR module

import mariadb
from mariadb.constants import *

# connection parameters
conn_params= {
    "user" : "example_user",
    "password" : "wrong_password",
    "host" : "localhost"
}

# try to establish a connection
try:
    connection= mariadb.connect(**conn_params)
except mariadb.OperationalError as Err:
    if Err.errno == ERR.ER_ACCESS_DENIED_ERROR:
        print("Access denied. Wrong password!")

Output:

Access denied. Wrong password!

FIELD_FLAG¶

New in version 1.1.0.

MariaDB FIELD_FLAG Constants

These constants represent the various field flags. As an addition to the DBAPI 2.0 standard (PEP-249) these flags are returned as eighth element of the cursor description attribute.

Field flags are defined in module mariadb.constants.FIELD_FLAG

FIELD_FLAG.NOT_NULL¶: column is defined as not NULL

FIELD_FLAG.PRIMARY_KEY¶: column is (part of) a primary key

FIELD_FLAG.UNIQUE_KEY¶: column is (part of) a unique key

FIELD_FLAG.MULTIPLE_KEY¶: column is (part of) a key

FIELD_FLAG.BLOB¶: column contains a binary object

FIELD_FLAG.UNSIGNED¶: numeric column is defined as unsigned

FIELD_FLAG.ZEROFILL¶: column has zerofill attribute

FIELD_FLAG.BINARY¶: column is a binary

FIELD_FLAG.ENUM¶: column is defined as enum

FIELD_FLAG.AUTO_INCREMENT¶: column is an auto_increment column

FIELD_FLAG.TIMESTAMP¶: column is defined as time stamp

FIELD_FLAG.SET¶: column is defined as SET

FIELD_FLAG.NO_DEFAULT¶: column hasn’t a default value

FIELD_FLAG.ON_UPDATE_NOW¶: column will be set to current timestamp on UPDATE

FIELD_FLAG.NUMERIC¶: column contains numeric value

FIELD_FLAG.PART_OF_KEY¶: column is part of a key

FIELD_TYPE¶

MariaDB FIELD_TYPE Constants

These constants represent the field types supported by MariaDB. The field type is returned as second element of cursor description attribute.

Field types are defined in module mariadb.constants.FIELD_TYPE

FIELD_TYPE.TINY¶: column type is TINYINT (1-byte integer)

FIELD_TYPE.SHORT¶: column type is SMALLINT (2-byte integer)

FIELD_TYPE.LONG¶: column tyoe is INT (4-byte integer)

FIELD_TYPE.FLOAT¶: column type is FLOAT (4-byte single precision)

FIELD_TYPE.DOUBLE¶: column type is DOUBLE (8-byte double precision)

FIELD_TYPE.NULL¶: column type is NULL

FIELD_TYPE.TIMESTAMP¶: column tyoe is TIMESTAMP

FIELD_TYPE.LONGLONG¶: column tyoe is BIGINT (8-byte Integer)

FIELD_TYPE.INT24¶: column type is MEDIUMINT (3-byte Integer)

FIELD_TYPE.DATE¶: column type is DATE

FIELD_TYPE.TIME¶: column type is TIME

FIELD_TYPE.DATETIME¶: column type is YEAR

FIELD_TYPE.YEAR¶

FIELD_TYPE.VARCHAR¶: column type is YEAR

FIELD_TYPE.BIT¶: column type is BIT

FIELD_TYPE.JSON¶: column type is JSON

FIELD_TYPE.NEWDECIMAL¶: column type is DECIMAL

FIELD_TYPE.ENUM¶: column type is ENUM

FIELD_TYPE.SET¶: column type is SET

FIELD_TYPE.TINY_BLOB¶: column type is TINYBLOB (max. length of 255 bytes)

FIELD_TYPE.MEDIUM_BLOB¶: column type is MEDIUMBLOB (max. length of 16,777,215 bytes)

FIELD_TYPE.LONG_BLOB¶: column type is LONGBLOB (max. length 4GB bytes)

FIELD_TYPE.BLOB¶: column type is BLOB (max. length of 65.535 bytes)

FIELD_TYPE.VAR_STRING¶: column type is VARCHAR (variable length)

FIELD_TYPE.STRING¶: column tyoe is CHAR (fixed length)

FIELD_TYPE.GEOMETRY¶: column type is GEOMETRY

INDICATORS¶

Indicator values are used in executemany() method of cursor class to indicate special values when connected to a MariaDB server 10.2 or newer.

INDICATOR.NULL¶

indicates a NULL value

INDICATOR.DEFAULT¶

indicates to use default value of column

INDICATOR.IGNORE¶

indicates to ignore value for column for UPDATE statements. If set, the column will not be updated.

INDICATOR.IGNORE_ROW¶

indicates not to update the entire row.

INFO¶

New in version 1.1.0.

For internal use only

TPC_STATE¶

New in version 1.1.0.

For internal use only

STATUS¶

New in version 1.1.0.

The STATUS constants are used to check the server status of the current connection.

Example:

cursor.callproc("my_storedprocedure", (1,"foo"))

if (connection.server_status & STATUS.SP_OUT_PARAMS):
    print("retrieving output parameters from store procedure")
    ...
else:
    print("retrieving data from stored procedure")
    ....

STATUS.IN_TRANS¶: Pending transaction

STATUS.AUTOCOMMIT¶: Server operates in autocommit mode

STATUS.MORE_RESULTS_EXIST¶: The result from last executed statement contained two or more result sets which can be retrieved by cursors nextset() method.

STATUS.QUERY_NO_GOOD_INDEX_USED¶: The last executed statement didn’t use a good index.

STATUS.QUERY_NO_INDEX_USED¶: The last executed statement didn’t use an index.

STATUS.CURSOR_EXISTS¶: The last executed statement opened a server side cursor.

STATUS.LAST_ROW_SENT¶: For server side cursors this flag indicates end of a result set.

STATUS.DB_DROPPED¶: The current database in use was dropped and there is no default database for the connection anymore.

STATUS.NO_BACKSLASH_ESCAPES¶: Indicates that SQL mode NO_BACKSLASH_ESCAPE is active, which means that the backslash character ‘' becomes an ordinary character.

STATUS.QUERY_WAS_SLOW¶: The previously executed statement was slow (and needs to be optimized).

STATUS.PS_OUT_PARAMS¶: The current result set contains output parameters of a stored procedure.

STATUS.SESSION_STATE_CHANGED¶: The session status has been changed.

STATUS.ANSI_QUOTES¶: SQL mode ANSI_QUOTES is active,

Constants¶

CAPABILITY¶

CLIENT¶

CURSOR¶

ERR (Error)¶

FIELD_FLAG¶

FIELD_TYPE¶

INDICATORS¶

INFO¶

TPC_STATE¶

STATUS¶

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