Ora-00909: invalid number of parameters, caused by concat

Use in the project Mybatis When making fuzzy queries , Use concat function , The number of error reporting parameters is invalid

reason

Oracle Only the splicing of two strings at a time is supported , But similar concat(‘%’,#{param},‘%’) It belongs to the splicing of three strings , Therefore, the number of error parameters is invalid

resolvent

Nested twice concat

concat(concat('%',#{param}),'%')