mysql-testsuite-5.6 5.6.16-1~exp1 / usr / lib / mysql-testsuite / t / get_diagnostics.test

--echo #
--echo # WL#2111: GET DIAGNOSTICS tests
--echo #

--echo #
--echo # Test reserved keywords: GET
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
DROP PROCEDURE IF EXISTS p1;
--enable_warnings

--error ER_PARSE_ERROR
CREATE TABLE t1 (get INT);

DELIMITER |;
--error ER_PARSE_ERROR
CREATE PROCEDURE p1()
BEGIN
  DECLARE get INT DEFAULT 1;
END|
DELIMITER ;|

--echo # Quoting

CREATE TABLE t1 (`get` INT);
INSERT INTO t1 (`get`) values (1);
SELECT `get` FROM t1 WHERE `get` = 1;
DROP TABLE t1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE `get` INT DEFAULT 1;
  SELECT `get`;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo #
--echo # Test non-reserved keywords: CURRENT, DIAGNOSTICS, NUMBER, RETURNED_SQLSTATE
--echo #

--disable_warnings
DROP TABLE IF EXISTS t1;
DROP PROCEDURE IF EXISTS p1;
--enable_warnings

CREATE TABLE t1 (current INT, diagnostics INT, number INT, returned_sqlstate INT);
INSERT INTO t1 (current, diagnostics, number, returned_sqlstate) values (1,2,3,4);
SELECT current, diagnostics, number, returned_sqlstate FROM t1 WHERE number = 3;
SELECT `current`, `number` FROM t1 WHERE `current` = 1 AND `number` = 3;
DROP TABLE t1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE current INT DEFAULT 1;
  DECLARE diagnostics INT DEFAULT 2;
  DECLARE number INT DEFAULT 3;
  DECLARE returned_sqlstate INT DEFAULT 4;
  SELECT current, diagnostics, number, returned_sqlstate;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo #
--echo # Test GET DIAGNOSTICS syntax
--echo #

--disable_warnings
DROP PROCEDURE IF EXISTS p1;
--enable_warnings

--error ER_PARSE_ERROR
GET;
--error ER_PARSE_ERROR
GET CURRENT;
--error ER_PARSE_ERROR
GET DIAGNOSTICS;
--error ER_PARSE_ERROR
GET CURRENT DIAGNOSTICS;

--echo
--echo # Statement information syntax
--echo

--error ER_PARSE_ERROR
GET DIAGNOSTICS @var;

--error ER_SP_UNDECLARED_VAR
GET DIAGNOSTICS var;

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  GET DIAGNOSTICS var;
END|
DELIMITER ;|

DELIMITER |;
--error ER_PARSE_ERROR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS var;
END|
DELIMITER ;|

--error ER_PARSE_ERROR
GET DIAGNOSTICS @var =;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var = INVALID;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var = MORE;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var = INVALID,;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var1 = NUMBER, @var2;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var1 = NUMBER, @var2 = INVALID;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @@var1 = NUMBER;
--error ER_PARSE_ERROR
GET DIAGNOSTICS @var1 = NUMBER, @@var2 = NUMBER;

DELIMITER |;
--error ER_PARSE_ERROR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS var = INVALID;
END|
DELIMITER ;|

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var CONDITION FOR SQLSTATE '12345';
  GET DIAGNOSTICS var = NUMBER;
END|
DELIMITER ;|

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS var = NUMBER, var1 = ROW_COUNT;
END|
DELIMITER ;|

GET DIAGNOSTICS @var = NUMBER;
GET DIAGNOSTICS @var = ROW_COUNT;
GET DIAGNOSTICS @var1 = NUMBER, @var2 = ROW_COUNT;
GET DIAGNOSTICS @var1 = ROW_COUNT, @var2 = NUMBER;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE var  INT;
  DECLARE var1 INT;
  DECLARE var2 INT;
  GET DIAGNOSTICS var = NUMBER;
  GET DIAGNOSTICS var = ROW_COUNT;
  GET DIAGNOSTICS var1 = NUMBER, var2 = ROW_COUNT;
  GET DIAGNOSTICS var1 = ROW_COUNT, var2 = NUMBER;
END|
DELIMITER ;|

DROP PROCEDURE p1;

--echo
--echo # Condition information syntax
--echo

--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION a;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1;

--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var;

--error ER_SP_UNDECLARED_VAR
GET DIAGNOSTICS CONDITION 1 var;

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  GET DIAGNOSTICS CONDITION 1 var;
END|
DELIMITER ;|

DELIMITER |;
--error ER_PARSE_ERROR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS CONDITION 1 var;
END|
DELIMITER ;|

--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var =;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var = INVALID;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var = NUMBER;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var = INVALID,;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var1 = CLASS_ORIGIN, @var2;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var1 = CLASS_ORIGIN, @var2 = INVALID;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @@var1 = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1 @var1 = CLASS_ORIGIN, @@var2 = CLASS_ORIGIN;

DELIMITER |;
--error ER_PARSE_ERROR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS CONDITION 1 var = INVALID;
END|
DELIMITER ;|

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var CONDITION FOR SQLSTATE '12345';
  GET DIAGNOSTICS CONDITION 1 var = NUMBER;
END|
DELIMITER ;|

DELIMITER |;
--error ER_SP_UNDECLARED_VAR
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS CONDITION 1 var = CLASS_ORIGIN, var1 = SUBCLASS_ORIGIN;
END|
DELIMITER ;|

GET DIAGNOSTICS CONDITION 1 @var = CLASS_ORIGIN;
GET DIAGNOSTICS CONDITION 1 @var = SUBCLASS_ORIGIN;
GET DIAGNOSTICS CONDITION 1 @var1 = CLASS_ORIGIN, @var2 = SUBCLASS_ORIGIN;
GET DIAGNOSTICS CONDITION 1 @var1 = SUBCLASS_ORIGIN, @var2 = CLASS_ORIGIN;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE var  INT;
  DECLARE var1 INT;
  DECLARE var2 INT;
  GET DIAGNOSTICS CONDITION 1 var = CLASS_ORIGIN;
  GET DIAGNOSTICS CONDITION 1 var = SUBCLASS_ORIGIN;
  GET DIAGNOSTICS CONDITION 1 var1 = CLASS_ORIGIN, var2 = SUBCLASS_ORIGIN;
  GET DIAGNOSTICS CONDITION 1 var1 = SUBCLASS_ORIGIN, var2 = CLASS_ORIGIN;
END|
DELIMITER ;|

DROP PROCEDURE p1;

--echo # Condition number expression

--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION -1 @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION 1+1 @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION ? @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION (1) @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION p1() @var = CLASS_ORIGIN;
--error ER_PARSE_ERROR
GET DIAGNOSTICS CONDITION ABS(2) @var = CLASS_ORIGIN;

# Unfortunate side effects...
GET DIAGNOSTICS CONDITION 1.1 @var = CLASS_ORIGIN;
GET DIAGNOSTICS CONDITION "1" @var = CLASS_ORIGIN;

# Reset warnings
SELECT COUNT(max_questions) INTO @var FROM mysql.user;

GET DIAGNOSTICS CONDITION 9999 @var = CLASS_ORIGIN;
GET DIAGNOSTICS CONDITION NULL @var = CLASS_ORIGIN;
GET DIAGNOSTICS CONDITION a @var = CLASS_ORIGIN;

# Reset warnings
SELECT COUNT(max_questions) INTO @var FROM mysql.user;

SET @cond = 1;
GET DIAGNOSTICS CONDITION @cond @var1 = CLASS_ORIGIN;

SET @cond = "invalid";
GET DIAGNOSTICS CONDITION @cond @var1 = CLASS_ORIGIN;

# Reset warnings
SELECT COUNT(max_questions) INTO @var FROM mysql.user;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE cond INT DEFAULT 1;
  DECLARE var INT;
  GET DIAGNOSTICS CONDITION cond var = CLASS_ORIGIN;
END|
DELIMITER ;|

DROP PROCEDURE p1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE cond TEXT;
  DECLARE var INT;
  GET DIAGNOSTICS CONDITION cond var = CLASS_ORIGIN;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo #
--echo # Test GET DIAGNOSTICS runtime
--echo #

--echo
--echo # GET DIAGNOSTICS cannot be the object of a PREPARE statement.
--echo

--error ER_UNSUPPORTED_PS
PREPARE stmt FROM "GET DIAGNOSTICS CONDITION 1 @var = CLASS_ORIGIN";
--error ER_UNSUPPORTED_PS
PREPARE stmt FROM "GET DIAGNOSTICS @var = NUMBER";

--echo
--echo # GET DIAGNOSTICS does not clear the diagnostics area.
--echo

SELECT CAST(-19999999999999999999 AS SIGNED);
GET DIAGNOSTICS @var = NUMBER;
SHOW WARNINGS;

--echo #
--echo # If GET DIAGNOSTICS itself causes an error, an error message is appended.
--echo #

SELECT CAST(-19999999999999999999 AS SIGNED);
GET DIAGNOSTICS CONDITION 99999 @var = CLASS_ORIGIN;
SHOW WARNINGS;

--echo
--echo # Statement information runtime
--echo

SELECT CAST(-19999999999999999999 AS SIGNED),
       CAST(-19999999999999999999 AS SIGNED);
GET DIAGNOSTICS @var = NUMBER;
SELECT @var;

SELECT COUNT(max_questions) INTO @var FROM mysql.user;
GET DIAGNOSTICS @var = NUMBER;
SELECT @var;

SELECT 1;
GET DIAGNOSTICS @var = ROW_COUNT;
SELECT @var;

CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);
GET DIAGNOSTICS @var = ROW_COUNT;
SELECT @var;
DROP TABLE t1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE number INT;
  DECLARE row_count INT;

  SELECT CAST(-19999999999999999999 AS SIGNED),
         CAST(-19999999999999999999 AS SIGNED);

  GET DIAGNOSTICS number = NUMBER;

  CREATE TABLE t1 (a INT);
  INSERT INTO t1 VALUES (1),(2),(3);
  GET DIAGNOSTICS row_count = ROW_COUNT;
  DROP TABLE t1;

  SELECT number, row_count;

END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo
--echo # Condition information runtime
--echo

SELECT CAST(-19999999999999999999 AS SIGNED);

GET DIAGNOSTICS CONDITION 1
  @class_origin = CLASS_ORIGIN,
  @subclass_origin = SUBCLASS_ORIGIN,
  @constraint_catalog = CONSTRAINT_CATALOG,
  @constraint_schema = CONSTRAINT_SCHEMA,
  @constraint_name = CONSTRAINT_NAME,
  @catalog_name = CATALOG_NAME,
  @schema_name = SCHEMA_NAME,
  @table_name = TABLE_NAME,
  @column_name = COLUMN_NAME,
  @cursor_name = CURSOR_NAME,
  @message_text = MESSAGE_TEXT,
  @mysql_errno = MYSQL_ERRNO,
  @returned_sqlstate = RETURNED_SQLSTATE;

--vertical_results
SELECT
  @class_origin,
  @subclass_origin,
  @constraint_catalog,
  @constraint_schema,
  @constraint_name,
  @catalog_name,
  @schema_name,
  @table_name,
  @column_name,
  @cursor_name,
  @message_text,
  @mysql_errno,
  @returned_sqlstate;
--horizontal_results

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
    DECLARE class_origin TEXT DEFAULT "a";
    DECLARE subclass_origin TEXT DEFAULT "a";
    DECLARE constraint_catalog TEXT DEFAULT "a";
    DECLARE constraint_schema TEXT DEFAULT "a";
    DECLARE constraint_name TEXT DEFAULT "a";
    DECLARE catalog_name TEXT DEFAULT "a";
    DECLARE schema_name TEXT DEFAULT "a";
    DECLARE table_name TEXT DEFAULT "a";
    DECLARE column_name TEXT DEFAULT "a";
    DECLARE cursor_name TEXT DEFAULT "a";
    DECLARE message_text TEXT DEFAULT "a";
    DECLARE mysql_errno INT DEFAULT 1;
    DECLARE returned_sqlstate TEXT DEFAULT "a";

  SELECT CAST(-19999999999999999999 AS SIGNED);

  GET DIAGNOSTICS CONDITION 1
    class_origin = CLASS_ORIGIN,
    subclass_origin = SUBCLASS_ORIGIN,
    constraint_catalog = CONSTRAINT_CATALOG,
    constraint_schema = CONSTRAINT_SCHEMA,
    constraint_name = CONSTRAINT_NAME,
    catalog_name = CATALOG_NAME,
    schema_name = SCHEMA_NAME,
    table_name = TABLE_NAME,
    column_name = COLUMN_NAME,
    cursor_name = CURSOR_NAME,
    message_text = MESSAGE_TEXT,
    mysql_errno = MYSQL_ERRNO,
    returned_sqlstate = RETURNED_SQLSTATE;

  SELECT
    class_origin,
    subclass_origin,
    constraint_catalog,
    constraint_schema,
    constraint_name,
    catalog_name,
    schema_name,
    table_name,
    column_name,
    cursor_name,
    message_text,
    mysql_errno,
    returned_sqlstate;
END|
DELIMITER ;|

--vertical_results
CALL p1();
--horizontal_results

DROP PROCEDURE p1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE errno1 INT;
  DECLARE errno2 INT;
  DECLARE msg1 TEXT;
  DECLARE msg2 TEXT;

  SELECT CAST(-19999999999999999999 AS SIGNED);
  GET DIAGNOSTICS CONDITION 99999 msg1 = MESSAGE_TEXT;

  GET DIAGNOSTICS CONDITION 1 errno1 = MYSQL_ERRNO, msg1 = MESSAGE_TEXT;
  GET DIAGNOSTICS CONDITION 2 errno2 = MYSQL_ERRNO, msg2 = MESSAGE_TEXT;

  SELECT errno1, msg1, errno2, msg2;
END|
DELIMITER ;|

--vertical_results
CALL p1();
--horizontal_results

DROP PROCEDURE p1;

--echo
--echo # Interaction with SIGNAL
--echo

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE errno INT DEFAULT 0;
  DECLARE msg TEXT DEFAULT "foo";
  DECLARE cond CONDITION FOR SQLSTATE "01234";
  DECLARE CONTINUE HANDLER for 1012
  BEGIN
    GET DIAGNOSTICS CONDITION 1 errno = MYSQL_ERRNO, msg = MESSAGE_TEXT;
  END;

  SIGNAL cond SET MESSAGE_TEXT = "Signal message", MYSQL_ERRNO = 1012;

  SELECT errno, msg;
END|
DELIMITER ;|

--vertical_results
CALL p1();
--horizontal_results

DROP PROCEDURE p1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  SIGNAL SQLSTATE '77777' SET MYSQL_ERRNO = 1000, MESSAGE_TEXT='ÁÂÃÅÄ';
END|
DELIMITER ;|

--error 1000
CALL p1();

GET DIAGNOSTICS CONDITION 1
  @mysql_errno = MYSQL_ERRNO, @message_text = MESSAGE_TEXT,
  @returned_sqlstate = RETURNED_SQLSTATE, @class_origin = CLASS_ORIGIN;

--vertical_results
SELECT @mysql_errno, @message_text, @returned_sqlstate, @class_origin;
--horizontal_results

DROP PROCEDURE p1;

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE cond CONDITION FOR SQLSTATE '12345';
  SIGNAL cond SET
    CLASS_ORIGIN = 'CLASS_ORIGIN text',
    SUBCLASS_ORIGIN = 'SUBCLASS_ORIGIN text',
    CONSTRAINT_CATALOG = 'CONSTRAINT_CATALOG text',
    CONSTRAINT_SCHEMA = 'CONSTRAINT_SCHEMA text',
    CONSTRAINT_NAME = 'CONSTRAINT_NAME text',
    CATALOG_NAME = 'CATALOG_NAME text',
    SCHEMA_NAME = 'SCHEMA_NAME text',
    TABLE_NAME = 'TABLE_NAME text',
    COLUMN_NAME = 'COLUMN_NAME text',
    CURSOR_NAME = 'CURSOR_NAME text',
    MESSAGE_TEXT = 'MESSAGE_TEXT text',
    MYSQL_ERRNO = 54321;
END|
DELIMITER ;|

--error 54321
CALL p1();

GET DIAGNOSTICS CONDITION 1
  @class_origin = CLASS_ORIGIN,
  @subclass_origin = SUBCLASS_ORIGIN,
  @constraint_catalog = CONSTRAINT_CATALOG,
  @constraint_schema = CONSTRAINT_SCHEMA,
  @constraint_name = CONSTRAINT_NAME,
  @catalog_name = CATALOG_NAME,
  @schema_name = SCHEMA_NAME,
  @table_name = TABLE_NAME,
  @column_name = COLUMN_NAME,
  @cursor_name = CURSOR_NAME,
  @message_text = MESSAGE_TEXT,
  @mysql_errno = MYSQL_ERRNO,
  @returned_sqlstate = RETURNED_SQLSTATE;

--vertical_results
SELECT
  @class_origin,
  @subclass_origin,
  @constraint_catalog,
  @constraint_schema,
  @constraint_name,
  @catalog_name,
  @schema_name,
  @table_name,
  @column_name,
  @cursor_name,
  @message_text,
  @mysql_errno,
  @returned_sqlstate;
--horizontal_results

DROP PROCEDURE p1;

--echo #
--echo # Demonstration
--echo #

--echo
--echo # The same statement information item can be used multiple times.
--echo

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE var INT;
  GET DIAGNOSTICS var = NUMBER, @var = NUMBER;
  SELECT var, @var;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo
--echo # Setting TABLE_NAME is currently not implemented.
--echo

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE v VARCHAR(64);
  DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
    GET DIAGNOSTICS CONDITION 1 v = TABLE_NAME;
  DROP TABLE no_such_table;
  SELECT v;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo
--echo # Message is truncated to fit into target. No truncation warning.
--echo

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE v CHAR(1);
  CREATE TABLE IF NOT EXISTS t1 (a INT);
  GET DIAGNOSTICS CONDITION 1 v = MESSAGE_TEXT;
  SELECT v;
END|
DELIMITER ;|

CREATE TABLE t1 (a INT);
CALL p1();
DROP TABLE t1;

DROP PROCEDURE p1;

--echo
--echo # Returns number of rows updated by the UPDATE statements.
--echo

DELIMITER |;
CREATE PROCEDURE p1(IN param INT)
LANGUAGE SQL
BEGIN
  DECLARE v INT DEFAULT 0;
  DECLARE rcount_each INT;
  DECLARE rcount_total INT DEFAULT 0;
  WHILE v < 5 DO
    UPDATE t1 SET a = a * 1.1  WHERE b = param;
    GET DIAGNOSTICS rcount_each = ROW_COUNT;
    SET rcount_total = rcount_total + rcount_each;
    SET v = v + 1;
    END WHILE;
  SELECT rcount_total;
END|
DELIMITER ;|

CREATE TABLE t1 (a REAL, b INT);
INSERT INTO t1 VALUES (1.1, 1);
CALL p1(1);
DROP TABLE t1;

DROP PROCEDURE p1;

--echo
--echo # GET DIAGNOSTICS doesn't clear the diagnostics area.
--echo

DELIMITER |;
CREATE PROCEDURE p1()
BEGIN
  DECLARE CONTINUE HANDLER FOR SQLWARNING
    BEGIN
      GET CURRENT DIAGNOSTICS CONDITION 1 @x = RETURNED_SQLSTATE;
      SIGNAL SQLSTATE '01002';
      GET CURRENT DIAGNOSTICS CONDITION 1 @y = RETURNED_SQLSTATE;
    END;
  SIGNAL SQLSTATE '01001';
  SELECT @x, @y;
END|
DELIMITER ;|

CALL p1();

DROP PROCEDURE p1;

--echo
--echo # Using OUT and INOUT parameters as the target variables.
--echo

DELIMITER |;
CREATE PROCEDURE p1(OUT number INT, INOUT message TEXT)
BEGIN
  DECLARE warn CONDITION FOR SQLSTATE "01234";
  DECLARE CONTINUE HANDLER FOR SQLWARNING
    BEGIN
      GET DIAGNOSTICS number = NUMBER;
      GET DIAGNOSTICS CONDITION 1 message = MESSAGE_TEXT;
    END;
  SELECT message;
  SIGNAL warn SET MESSAGE_TEXT = "inout parameter";
END|
DELIMITER ;|

SET @var1 = 0;
SET @var2 = "message text";
CALL p1(@var1, @var2);
SELECT @var1, @var2;

DROP PROCEDURE p1;

--echo
--echo # Using an IN parameter as the target variable.
--echo

DELIMITER |;
CREATE PROCEDURE p1(IN number INT)
BEGIN
  SELECT number;
  GET DIAGNOSTICS number = NUMBER;
  SELECT number;
END|
DELIMITER ;|

SET @var1 = 9999;
CALL p1(@var1);
SELECT @var1;

DROP PROCEDURE p1;

--echo
--echo # Using GET DIAGNOSTICS in a stored function.
--echo

DELIMITER |;
CREATE FUNCTION f1() RETURNS TEXT
BEGIN
  DECLARE message TEXT;
  DECLARE warn CONDITION FOR SQLSTATE "01234";
  DECLARE CONTINUE HANDLER FOR SQLWARNING
    BEGIN
      GET DIAGNOSTICS CONDITION 1 message = MESSAGE_TEXT;
    END;
  SIGNAL warn SET MESSAGE_TEXT = "message text";
  return message;
END|
DELIMITER ;|

SELECT f1();

DROP FUNCTION f1;

--echo
--echo # Using GET DIAGNOSTICS in a trigger.
--echo

CREATE TABLE t1 (a INT);

DELIMITER |;
CREATE TRIGGER trg1 BEFORE INSERT ON t1 FOR EACH ROW
BEGIN
  DECLARE var INT DEFAULT row_count();
  GET DIAGNOSTICS @var1 = ROW_COUNT;
  SET @var2 = var;
END|
DELIMITER ;|

SET @var1 = 9999, @var2 = 9999;
INSERT INTO t1 VALUES (1), (2);
SELECT @var1, @var2;

DROP TRIGGER trg1;
DROP TABLE t1;

--echo
--echo # GET DIAGNOSTICS does not reset ROW_COUNT
--echo

CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1);
GET DIAGNOSTICS @var1 = ROW_COUNT;
GET DIAGNOSTICS @var2 = ROW_COUNT;
SELECT @var1, @var2;
DROP TABLE t1;

--echo
--echo # Items are UTF8 (utf8_general_ci default collation)
--echo

SELECT CAST(-19999999999999999999 AS SIGNED);
GET DIAGNOSTICS CONDITION 1 @var1 = MESSAGE_TEXT, @var2 = CLASS_ORIGIN;
SELECT CHARSET(@var1), COLLATION(@var1), COERCIBILITY(@var1);
SELECT CHARSET(@var2), COLLATION(@var2), COERCIBILITY(@var2);

--echo #
--echo # Command statistics
--echo #

FLUSH STATUS;
SHOW STATUS LIKE 'Com%get_diagnostics';
GET DIAGNOSTICS @var1 = NUMBER;
SHOW STATUS LIKE 'Com%get_diagnostics';