我试图将params绑定到INSERT INTO
MySQLi预处理语句,如果该变量存在,否则插入null.然后我知道
type variable i corresponding variable has type integer d corresponding variable has type double s corresponding variable has type string b corresponding variable is a blob and will be sent in packets
但是当我插入一个变量= null时,我如何定义变量的类型？或者我应该定义类型”？
