1、语法：REPLACE ( original-string, search-string, replace-string )注：orig足毂忍珩inal-string：被搜索的字符串。可为任意长度。search-string：要搜索并被 replace-string 替换的字符串。该字符串的长度不应超过 255 个字节。如果 search-string 是空字符串，则按原样返回原始字符串。replace-string：该字符串用于替换 search-string。可为任意长度。如果 replacement-string 是空字符串，则删除出现的所有 search-string。
2、例：select REPLACE ( msgcontent, '身体健康', '11111111111111' ) as msgcontent from fw_sendmsginfo where msgid = '3717'REPLACE ( REPLACE ( REPLACE ( original-string, search-string, replace-string ), search-string, replace-string ), search-string, replace-string )注：可多重替换
