{currenthelptext} {product} {helptype} {viewcore}
STR(<Expression>) - 强制表达式值的类型为字符串
STR(4)
值为“4”
STR(4.5)
值为“4.5”
STR("Hello World")
值为“Hello World”
STR(MPOINT(3,4,5))
值为“3, 4, 5”