提交 4c012862 编写于 作者: wmmhello's avatar wmmhello

[TD-12252]<feature>(connector,query,insert,other,tools,taosAdapter):deal with escape character

上级 ace4d2ed
...@@ -1858,14 +1858,14 @@ TDengine 中的表(列)名命名规则如下: ...@@ -1858,14 +1858,14 @@ TDengine 中的表(列)名命名规则如下:
| 字符序列 | **代表的字符** | | 字符序列 | **代表的字符** |
| :--------: | ------- | | :--------: | ------- |
| \' | 单引号' | | `\'` | 单引号' |
| \" | 双引号" | | `\"` | 双引号" |
| \n | 换行符 | | \n | 换行符 |
| \r | 回车符 | | \r | 回车符 |
| \t | tab符 | | \t | tab符 |
| \\ | 斜杠\ | | `\\` | 斜杠\ |
| \% | % 规则见下 | | `\%` | % 规则见下 |
| \_ | _ 规则见下 | | `\_` | _ 规则见下 |
- 转义字符使用规则 - 转义字符使用规则
1. 标识符里有转义字符(数据库名、表名、列名) 1. 标识符里有转义字符(数据库名、表名、列名)
...@@ -1873,4 +1873,4 @@ TDengine 中的表(列)名命名规则如下: ...@@ -1873,4 +1873,4 @@ TDengine 中的表(列)名命名规则如下:
2. 反引号``标识符: 保持原样,不转义 2. 反引号``标识符: 保持原样,不转义
2. 数据里有转义字符 2. 数据里有转义字符
1. 遇到上面定义的转义字符会转义(%和_见下面说明),如果没有匹配的转义字符会忽略掉转义符\。 1. 遇到上面定义的转义字符会转义(%和_见下面说明),如果没有匹配的转义字符会忽略掉转义符\。
2. 对于%和_,因为在like里这两个字符是通配符,所以在模式匹配like里用\%和\_表示字符里本身的%和_,如果在like模式匹配上下文之外使用\%或\_,则它们的计算结果为字符串\%和\_,而不是%和_。 2. 对于%和_,因为在like里这两个字符是通配符,所以在模式匹配like里用`\%`和`\_`表示字符里本身的%和_,如果在like模式匹配上下文之外使用`\%`或`\_`,则它们的计算结果为字符串`\%`和`\_`,而不是%和_。
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...@@ -1340,14 +1340,14 @@ Is not null supports all types of columns. Non-null expression is < > "" and onl ...@@ -1340,14 +1340,14 @@ Is not null supports all types of columns. Non-null expression is < > "" and onl
| Escape Sequence | **Character Represented by Sequence** | | Escape Sequence | **Character Represented by Sequence** |
| :--------: | ------------------- | | :--------: | ------------------- |
| \\' | A single quote (') character | | `\'` | A single quote (') character |
| \\" | A double quote (") character | | `\"` | A double quote (") character |
| \n | A newline (linefeed) character | | \n | A newline (linefeed) character |
| \r | A carriage return character | | \r | A carriage return character |
| \t | A tab character | | \t | A tab character |
| \\\ | A backslash (\) character | | `\\` | A backslash (\) character |
| \\% | A % character; see note following the table | | `\%` | A % character; see note following the table |
| \\_ | A _ character; see note following the table | | `\_` | A _ character; see note following the table |
- Escape character usage rules - Escape character usage rules
- The escape characters that in a identifier (database name, table name, column name) - The escape characters that in a identifier (database name, table name, column name)
...@@ -1355,4 +1355,4 @@ Is not null supports all types of columns. Non-null expression is < > "" and onl ...@@ -1355,4 +1355,4 @@ Is not null supports all types of columns. Non-null expression is < > "" and onl
2. Backquote`` identifier: Keep it as it is. 2. Backquote`` identifier: Keep it as it is.
- The escape characters that in a data - The escape characters that in a data
3. The escape character defined above will be escaped (% and _ see the description below). If there is no matching escape character, the escape character will be ignored. 3. The escape character defined above will be escaped (% and _ see the description below). If there is no matching escape character, the escape character will be ignored.
4. The \% and \_ sequences are used to search for literal instances of % and _ in pattern-matching contexts where they would otherwise be interpreted as wildcard characters.If you use \% or \_ outside of pattern-matching contexts, they evaluate to the strings \% and \_, not to % and _. 4. The `\%` and `\_` sequences are used to search for literal instances of % and _ in pattern-matching contexts where they would otherwise be interpreted as wildcard characters.If you use `\%` or `\_` outside of pattern-matching contexts, they evaluate to the strings `\%` and `\_`, not to % and _.
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