MySQL使用问题记录

在使用MybatisPlus做一个记录的查询，出现一个奇怪的错误，异常信息如下：

line 1:136 mismatched input 'source' expecting {'!', '~', '+', '-', '.', '(', '{', '?', '@', TRUNCATE, POSITION, VIEW, VALUES, CASE, CAST, TRIM, SUBSTRING, LEFT, RIGHT, IF, NOT, NULL, TRUE, FALSE, EXISTS, ANY, OFFSET, BEGIN, COMMIT, ROLLBACK, SAVEPOINT, BOOLEAN, CHAR, INTERVAL, DATE, TIME, TIMESTAMP, LOCALTIME, LOCALTIMESTAMP, YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, SECOND, MICROSECOND, MAX, MIN, SUM, COUNT, AVG, CURRENT, ENABLE, DISABLE, INSTANCE, DO, DEFINER, CASCADED, LOCAL, CLOSE, OPEN, NEXT, NAME, TYPE, DATABASE, TABLES, TABLESPACE, COLUMNS, FIELDS, INDEXES, STATUS, REPLACE, MODIFY, VALUE, DUPLICATE, FIRST, LAST, AFTER, OJ, MOD, ACCOUNT, USER, ROLE, START, TRANSACTION, ROW, WITHOUT, BINARY, ESCAPE, SUBPARTITION, STORAGE, SUPER, SUBSTR, TEMPORARY, THAN, UNBOUNDED, UPGRADE, VALIDATION, ROLLUP, SOUNDS, UNKNOWN, OFF, ALWAYS, COMMITTED, LEVEL, NO, PASSWORD, PRIVILEGES, ACTION, ALGORITHM, AUTOCOMMIT, BTREE, CHAIN, CHARSET, CHECKSUM, CIPHER, CLIENT, COALESCE, COMMENT, COMPACT, COMPRESSED, COMPRESSION, CONNECTION, CONSISTENT, CONVERT, DATA, DISCARD, DISK, ENCRYPTION, END, ENGINE, EVENT, EXCHANGE, EXECUTE, EXTRACT, FILE, FIXED, FOLLOWING, GLOBAL, HASH, IMPORT_, LESS, MATCH, MEMORY, NONE, NOW, PARSER, PARTIAL, PARTITIONING, PERSIST, PRECEDING, PROCESS, PROXY, QUICK, REBUILD, REDUNDANT, RELOAD, REMOVE, REORGANIZE, REPAIR, REVERSE, SESSION, SHUTDOWN, SIMPLE, SLAVE, VISIBLE, INVISIBLE, ENFORCED, AGAINST, LANGUAGE, MODE, QUERY, EXTENDED, EXPANSION, VARIANCE, MAX_ROWS, MIN_ROWS, SQL_BIG_RESULT, SQL_BUFFER_RESULT, SQL_CACHE, SQL_NO_CACHE, STATS_AUTO_RECALC, STATS_PERSISTENT, STATS_SAMPLE_PAGES, ROW_FORMAT, WEIGHT_STRING, COLUMN_FORMAT, INSERT_METHOD, KEY_BLOCK_SIZE, PACK_KEYS, PERSIST_ONLY, BIT_AND, BIT_OR, BIT_XOR, GROUP_CONCAT, JSON_ARRAYAGG, JSON_OBJECTAGG, STD, STDDEV, STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP, AUTO_INCREMENT, AVG_ROW_LENGTH, DELAY_KEY_WRITE, CURRENT_TIMESTAMP, ROTATE, MASTER, BINLOG, ERROR, SCHEDULE, COMPLETION, EVERY, HOST, SOCKET, PORT, SERVER, WRAPPER, OPTIONS, OWNER, RETURNS, CONTAINS, SECURITY, INVOKER, TEMPTABLE, MERGE, UNDEFINED, DATAFILE, FILE_BLOCK_SIZE, EXTENT_SIZE, INITIAL_SIZE, AUTOEXTEND_SIZE, MAX_SIZE, NODEGROUP, WAIT, LOGFILE, UNDOFILE, UNDO_BUFFER_SIZE, REDO_BUFFER_SIZE, HANDLER, PREV, ORGANIZATION, DEFINITION, DESCRIPTION, REFERENCE, FOLLOWS, PRECEDES, IMPORT, CONCURRENT, XML, DUMPFILE, SHARE, CODE, CONTEXT, CHANNEL, CLONE, AGGREGATE, INSTALL, UNINSTALL, RESOURCE, EXPIRE, NEVER, HISTORY, OPTIONAL, REUSE, MAX_QUERIES_PER_HOUR, MAX_UPDATES_PER_HOUR, MAX_CONNECTIONS_PER_HOUR, MAX_USER_CONNECTIONS, RETAIN, RANDOM, OLD, ISSUER, SUBJECT, CACHE, GENERAL, SLOW, USER_RESOURCES, EXPORT, RELAY, HOSTS, FLUSH, RESET, RESTART, UNIX_TIMESTAMP, LOWER, UPPER, DATEDIFF, DATE_FORMAT, DAYNAME, DAYOFMONTH, DAYOFWEEK, DAYOFYEAR, STR_TO_DATE, TIMEDIFF, TIMESTAMPADD, TIMESTAMPDIFF, TIME_FORMAT, TIME_TO_SEC, AES_DECRYPT, AES_ENCRYPT, FROM_BASE64, TO_BASE64, IDENTIFIER_, STRING_, NUMBER_, HEX_DIGIT_, BIT_NUM_}
line 1:250 no viable alternative at input '(express_code=?ANDsource'

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.ClassCastException: org.antlr.v4.runtime.tree.ErrorNodeImpl cannot be cast to org.antlr.v4.runtime.ParserRuleContext
### The error may exist in */mapper/LogisticsMapper.java (best guess)
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT id, express_code, express_name, disabled, source, create_by, create_time, update_by, update_time, delete_flag FROM logistics WHERE (express_code = ? AND source = ?)
### Cause: java.lang.ClassCastException: org.antlr.v4.runtime.tree.ErrorNodeImpl cannot be cast to org.antlr.v4.runtime.ParserRuleContext

	at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:96)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:441)
	at com.sun.proxy.$Proxy155.selectList(Unknown Source)
	at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:224)
	...

题主使用环境：Mybatis + MySQL。
首先一直把问题定位在 org.antlr.v4.runtime.tree.ErrorNodeImpl cannot be cast to org.antlr.v4.runtime.ParserRuleContext 这里，想着去应该是Jar包依赖的问题，排查半天无果；
后来查到一篇文章说是SQL中包含了关键字，自己一开始也直接排除了这个可能，因为将执行的SQL复制到Navicat执行，可以执行成功，且没有对关键词的提示（众所周知，Navicat中对关键字会高亮提示）；最后抱着试试的态度，将 source 这个字段重命名，执行成功了！

总结

数据库字段使用了关键字导致了这个问题。
题主这里用到了source这个字段，而这个字段就是MySQL关键字；
MySQL关键字可参考官网：https://dev.mysql.com/doc/refman/8.0/en/keywords.html