#yyds干货盘点# 解决Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "(" "( ""

解决Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "(" "( "" at line 10, column 42.

运行mybatis查询sql时报错异常：

Caused by: net.sf.jsqlparser.parser.ParseException: Encountered " "(" "( "" at line 10, column 42.
Was expecting one of:
    "AS" ...
    "DO" ...
    "ANY" ...
    "KEY" ...
    "PERCENT" ...
    "END" ...
    "INTO" ...
    "FROM" ...
    "OPEN" ...
    "TABLE" ...
    "WHERE" ...
    "FOR" ...
    "XML" ...
    "UNION" ...
    "GROUP" ...
    "ORDER" ...
    "VALUE" ...
    "HAVING" ...
    "INSERT" ...
    "VALUES" ...
    "REPLACE" ...
    "TRUNCATE" ...
    "INTERSECT" ...
    "CAST" ...
    "EXCEPT" ...
    "MINUS" ...
    "OVER" ...
    "PARTITION" ...
    "EXTRACT" ...
    "MATERIALIZED" ...
    "START" ...
    "CONNECT" ...
    "PRIOR" ...
    "SIBLINGS" ...
    "COLUMN" ...
    "NULLS" ...
    "FIRST" ...
    "LAST" ...
    "ROWS" ...
    "RANGE" ...
    "FOLLOWING" ...
    "ROW" ...
    "COMMIT" ...
    "SEPARATOR" ...
    "CASCADE" ...
    "NO" ...
    "ACTION" ...
    <K_DATETIMELITERAL> ...
    "PRECISION" ...
    <S_IDENTIFIER> ...
    <S_QUOTED_IDENTIFIER> ...
    "," ...
    ")" ...
    "|" ...
    "&" ...
    "^" ...
    "::" ...
    "ORDER" ...
    "ORDER" ...
    
    at net.sf.jsqlparser.parser.CCJSqlParser.generateParseException(CCJSqlParser.java:16395)
    at net.sf.jsqlparser.parser.CCJSqlParser.jj_consume_token(CCJSqlParser.java:16248)
    at net.sf.jsqlparser.parser.CCJSqlParser.PrimaryExpression(CCJSqlParser.java:6333)
    at net.sf.jsqlparser.parser.CCJSqlParser.BitwiseXor(CCJSqlParser.java:5926)
    at net.sf.jsqlparser.parser.CCJSqlParser.MultiplicativeExpression(CCJSqlParser.java:5883)
    at net.sf.jsqlparser.parser.CCJSqlParser.AdditiveExpression(CCJSqlParser.java:5845)
    at net.sf.jsqlparser.parser.CCJSqlParser.ConcatExpression(CCJSqlParser.java:5778)
    at net.sf.jsqlparser.parser.CCJSqlParser.BitwiseAndOr(CCJSqlParser.java:5802)
    at net.sf.jsqlparser.parser.CCJSqlParser.SimpleExpression(CCJSqlParser.java:5770)
    at net.sf.jsqlparser.parser.CCJSqlParser.CaseWhenExpression(CCJSqlParser.java:7275)
    at net.sf.jsqlparser.parser.CCJSqlParser.PrimaryExpression(CCJSqlParser.java:5964)
    at net.sf.jsqlparser.parser.CCJSqlParser.BitwiseXor(CCJSqlParser.java:5926)

查询sql：

SELECT DISTINCT CONCAT(IFNULL(c.ZH_NAME,''),IF(LENGTH(c.US_NAME) > 0 AND LENGTH(c.ZH_NAME) >
                    0,'/',''),IFNULL(c.US_NAME,''))
       
                   FROM table c

报错原因：是因为Mybatis 的分页插件SQL 语句中对 IF函数不支持

解决方法：

将 IF 替换成 case when 使用

 SELECT DISTINCT CONCAT(IFNULL(c.ZH_NAME,''),
                 case when  LENGTH(c.US_NAME) > 0 AND LENGTH(c.ZH_NAME) > 0
                   then '/'
                   else '' end
                  ,IFNULL(c.US_NAME,''))
                 FROM table c