MySQL 表名和字段名不要使用保留字命名
今天测试代码，新建了一张 Order 表，使用的 MySQL 数据库。
插入数据的时候报语法错误，我检查了好几遍，也没看出 SQL 语句哪里有问题，于是从 MyBatis 的日志里拷贝出 SQL 语句拿到 Navicate 里执行，同样报语法错误。
最后经过查找资料了解到，我的表名 Order 属于数据库保留的关键字。所以冲突了，有两种解决办法：
（1）使用撇号把表名包起来：`Order`，就不会报错了。
（2）修改表名为 OrderInfo。只要不是保留字就行。
在MySQL中，当表名或字段名乃至数据库名和保留字冲突时，在SQL语句里可以用撇号（`）括起来。
MySQL允许部分关键字用做未引起来的识别符，因为许多人以前曾使用过它们。下面列出了一些例子：
ACTION、BIT、DATE、ENUM、NO、TEXT、TIME、TIMESTAMP
注意：
SQL Server里是用 [ ] 括起来就能正常使用。
MySQL 里使用撇号（` 就是数字键1前面那个键）括起来才能正常使用。
附录：MySQL 保留字
| ADD | ALL | ALTER |
| ANALYZE | AND | AS |
| ASC | ASENSITIVE | BEFORE |
| BETWEEN | BIGINT | BINARY |
| BLOB | BOTH | BY |
| CALL | CASCADE | CASE |
| CHANGE | CHAR | CHARACTER |
| CHECK | COLLATE | COLUMN |
| CONDITION | CONNECTION | CONSTRAINT |
| CONTINUE | CONVERT | CREATE |
| CROSS | CURRENT_DATE | CURRENT_TIME |
| CURRENT_TIMESTAMP | CURRENT_USER | CURSOR |
| DATABASE | DATABASES | DAY_HOUR |
| DAY_MICROSECOND | DAY_MINUTE | DAY_SECOND |
| DEC | DECIMAL | DECLARE |
| DEFAULT | DELAYED | DELETE |
| DESC | DESCRIBE | DETERMINISTIC |
| DISTINCT | DISTINCTROW | DIV |
| DOUBLE | DROP | DUAL |
| EACH | ELSE | ELSEIF |
| ENCLOSED | ESCAPED | EXISTS |
| EXIT | EXPLAIN | FALSE |
| FETCH | FLOAT | FLOAT4 |
| FLOAT8 | FOR | FORCE |
| FOREIGN | FROM | FULLTEXT |
| GOTO | GRANT | GROUP |
| HAVING | HIGH_PRIORITY | HOUR_MICROSECOND |
| HOUR_MINUTE | HOUR_SECOND | IF |
| IGNORE | IN | INDEX |
| INFILE | INNER | INOUT |
| INSENSITIVE | INSERT | INT |
| INT1 | INT2 | INT3 |
| INT4 | INT8 | INTEGER |
| INTERVAL | INTO | IS |
| ITERATE | JOIN | KEY |
| KEYS | KILL | LABEL |
| LEADING | LEAVE | LEFT |
| LIKE | LIMIT | LINEAR |
| LINES | LOAD | LOCALTIME |
| LOCALTIMESTAMP | LOCK | LONG |
| LONGBLOB | LONGTEXT | LOOP |
| LOW_PRIORITY | MATCH | MEDIUMBLOB |
| MEDIUMINT | MEDIUMTEXT | MIDDLEINT |
| MINUTE_MICROSECOND | MINUTE_SECOND | MOD |
| MODIFIES | NATURAL | NOT |
| NO_WRITE_TO_BINLOG | NULL | NUMERIC |
| ON | OPTIMIZE | OPTION |
| OPTIONALLY | OR | ORDER |
| OUT | OUTER | OUTFILE |
| PRECISION | PRIMARY | PROCEDURE |
| PURGE | RAID0 | RANGE |
| READ | READS | REAL |
| REFERENCES | REGEXP | RELEASE |
| RENAME | REPEAT | REPLACE |
| REQUIRE | RESTRICT | RETURN |
| REVOKE | RIGHT | RLIKE |
| SCHEMA | SCHEMAS | SECOND_MICROSECOND |
| SELECT | SENSITIVE | SEPARATOR |
| SET | SHOW | SMALLINT |
| SPATIAL | SPECIFIC | SQL |
| SQLEXCEPTION | SQLSTATE | SQLWARNING |
| SQL_BIG_RESULT | SQL_CALC_FOUND_ROWS | SQL_SMALL_RESULT |
| SSL | STARTING | STRAIGHT_JOIN |
| TABLE | TERMINATED | THEN |
| TINYBLOB | TINYINT | TINYTEXT |
| TO | TRAILING | TRIGGER |
| TRUE | UNDO | UNION |
| UNIQUE | UNLOCK | UNSIGNED |
| UPDATE | USAGE | USE |
| USING | UTC_DATE | UTC_TIME |
| UTC_TIMESTAMP | VALUES | VARBINARY |
| VARCHAR | VARCHARACTER | VARYING |
| WHEN | WHERE | WHILE |
| WITH | WRITE | X509 |
| XOR | YEAR_MONTH | ZEROFILL |
