[mybatis错误] - sql出错 org.apache.ibatis.ognl.ParseException: Encountered "!" at line 1, column 15. Was expecting one of:

完整异常：Caused by: org.apache.ibatis.builder.BuilderException: Error evaluating expression 'developerType ! = '''. Cause: org.apache.ibatis.ognl.ExpressionSyntaxException: Malformed OGNL expression: developerType ! = '' [org.apache.ibatis.ognl.ParseException: Encountered "!" at line 1, column 15.
Was expecting one of:
    <EOF> 
    "," ...
    "=" ...
    "?" ...
    "||" ...
    "or" ...
    "&&" ...
    "and" ...
    "|" ...
    "bor" ...
    "^" ...
    "xor" ...
    "&" ...
    "band" ...
    "==" ...
    "eq" ...
    "!=" ...
    "neq" ...
    "<" ...
    "lt" ...
    ">" ...
    "gt" ...
    "<=" ...
    "lte" ...
    ">=" ...
    "gte" ...
    "in" ...
    "not" ...
    "<<" ...
    "shl" ...
    ">>" ...
    "shr" ...
    ">>>" ...
    "ushr" ...
    "+" ...
    "-" ...
    "*" ...
    "/" ...
    "%" ...
    "instanceof" ...
    "." ...
    "(" ...
    "[" ...
    <DYNAMIC_SUBSCRIPT> ...
    ]

这种问题出现在 字段 != null and 字段 != '' 

错误写为了 字段 != null and != '', 缺少and后面的字段.