Question

我一直在尝试为我的学校项目和所获得的语法创建MySQL词法分析器和解析器。其中一些是这样的：

expr:
expr OR expr
| expr || expr
| expr XOR expr
| expr AND expr
| expr && expr
| NOT expr
| ! expr
| boolean_primary IS [NOT] {TRUE | FALSE | UNKNOWN}
| boolean_primary

boolean_primary:
boolean_primary IS [NOT] NULL
| boolean_primary <=> predicate
| boolean_primary comparison_operator predicate
| boolean_primary comparison_operator {ALL | ANY} (subquery)
| predicate

comparison_operator: = | >= | > | <= | < | <> | !=

predicate:
bit_expr [NOT] IN (subquery)
| bit_expr [NOT] IN (expr [, expr] ...)
| bit_expr [NOT] BETWEEN bit_expr AND predicate
| bit_expr SOUNDS LIKE bit_expr
| bit_expr [NOT] LIKE simple_expr [ESCAPE simple_expr]
| bit_expr [NOT] REGEXP bit_expr
| bit_expr

 bit_expr:
 bit_expr | bit_expr
| bit_expr & bit_expr
| bit_expr << bit_expr
| bit_expr >> bit_expr
| bit_expr + bit_expr
| bit_expr - bit_expr
| bit_expr * bit_expr
| bit_expr / bit_expr
| bit_expr DIV bit_expr
| bit_expr MOD bit_expr
| bit_expr % bit_expr
| bit_expr ^ bit_expr
| bit_expr + interval_expr
| bit_expr - interval_expr
| simple_expr

 simple_expr:
 literal
| identifier
| function_call
| simple_expr COLLATE collation_name
| param_marker
| variable
| simple_expr || simple_expr
| + simple_expr
| - simple_expr
| ~ simple_expr
| ! simple_expr
| BINARY simple_expr
| (expr [, expr] ...)
| ROW (expr, expr [, expr] ...)
| (subquery)
| EXISTS (subquery)
| {identifier expr}
| match_expr
| case_expr
| interval

bit_expr代表什么？如果可能，我可以得到一个MySQL语法的情况，其中bit_expr被示例代码代替了吗？

Answer 1

一个非常简单的例子：

select 0b01 & 0b10, 0b01 | 0b10 from dual

返回

0, 3

mysql语法中的bit_expr是什么？

1 个答案: