mysql - check before creating - mysql

Question

I am creating tables in mysql 5.7 version, such as but would like to check if table exists before creating. or another scenario have some try catch block , where if table exits and i execute create again, it throws an error . i can catch that and log it.
CREATE TABLE `address` (
`Id` int(11) NOT NULL AUTO_INCREMENT,
`CreateTime` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`UpdateTime` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`UserId` int(11) DEFAULT NULL,
`Address1` varchar(100) CHARACTER SET utf8 NOT NULL,
`Address2` varchar(100) CHARACTER SET utf8 DEFAULT NULL,
`City` varchar(50) CHARACTER SET utf8 NOT NULL,
`State` int(11) NOT NULL,
`Zip` varchar(9) NOT NULL,
PRIMARY KEY (`Id`),
KEY `fk_address_user_UserId_idx` (`UserId`),
CONSTRAINT `fk_address_user_UserId` FOREIGN KEY (`UserId`) REFERENCES `user` (`Id`) ON DELETE CASCADE ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Answer 1

If you can dynamize schema and table names I've written a udf once to be used in a stored procedure like:
IF fn_table_exists('my_schema', 'table_to_be_created') THEN
SELECT 'Table Already exists!';
END IF;
Implementation:
DELIMITER $$
CREATE FUNCTION fn_table_exists(dbName VARCHAR(255), tableName VARCHAR(255)) RETURNS TINYINT(1)
BEGIN
DECLARE totalTablesCount INT DEFAULT (
SELECT COUNT(*)
FROM information_schema.TABLES
WHERE (TABLE_SCHEMA COLLATE utf8_general_ci = dbName COLLATE utf8_general_ci)
AND (TABLE_NAME COLLATE utf8_general_ci = tableName COLLATE utf8_general_ci)
);
RETURN IF(
totalTablesCount > 0,
TRUE,
FALSE
);
END$$
DELIMITER ;