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SQL Server字符串有西里尔字母完整的字符识别和替换解决方案

news 2025/9/18 10:17:52

1、SQL Server 字符测试

– 测试字符串 ‘PCВ-00135’ 中的字符类型

-- 1. 基本查询
SELECT 'PCВ-00135' AS 原始字符串;

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-- 2. 使用ASCII函数检查每个字符的ASCII值
SELECT 'PCВ-00135' AS 原始字符串,ASCII('P') AS P的ASCII值,ASCII('C') AS C的ASCII值,ASCII('В') AS В的ASCII值,ASCII('-') AS 横线的ASCII值,ASCII('0') AS 数字0的ASCII值,ASCII('1') AS 数字1的ASCII值,ASCII('3') AS 数字3的ASCII值,ASCII('5') AS 数字5的ASCII值;

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-- 3. 使用UNICODE函数检查Unicode值
SELECT 'PCВ-00135' AS 原始字符串,UNICODE('P') AS P的Unicode值,UNICODE('C') AS C的Unicode值,UNICODE('В') AS В的Unicode值,UNICODE('-') AS 横线的Unicode值,UNICODE('0') AS 数字0的Unicode值,UNICODE('1') AS 数字1的Unicode值,UNICODE('3') AS 数字3的Unicode值,UNICODE('5') AS 数字5的Unicode值;

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-- 4. 检查字符长度
SELECT 'PCВ-00135' AS 原始字符串,LEN('PCВ-00135') AS 字符长度,DATALENGTH('PCВ-00135') AS 字节长度;

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-- 5. 逐个字符分析
WITH CharAnalysis AS (SELECT 'PCВ-00135' AS 原始字符串,SUBSTRING('PCВ-00135', 1, 1) AS 字符1,SUBSTRING('PCВ-00135', 2, 1) AS 字符2,SUBSTRING('PCВ-00135', 3, 1) AS 字符3,SUBSTRING('PCВ-00135', 4, 1) AS 字符4,SUBSTRING('PCВ-00135', 5, 1) AS 字符5,SUBSTRING('PCВ-00135', 6, 1) AS 字符6,SUBSTRING('PCВ-00135', 7, 1) AS 字符7,SUBSTRING('PCВ-00135', 8, 1) AS 字符8,SUBSTRING('PCВ-00135', 9, 1) AS 字符9
)
SELECT 原始字符串,字符1, UNICODE(字符1) AS 字符1_Unicode,字符2, UNICODE(字符2) AS 字符2_Unicode,字符3, UNICODE(字符3) AS 字符3_Unicode,字符4, UNICODE(字符4) AS 字符4_Unicode,字符5, UNICODE(字符5) AS 字符5_Unicode,字符6, UNICODE(字符6) AS 字符6_Unicode,字符7, UNICODE(字符7) AS 字符7_Unicode,字符8, UNICODE(字符8) AS 字符8_Unicode,字符9, UNICODE(字符9) AS 字符9_Unicode
FROM CharAnalysis;

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-- 6. 比较全角和半角字符
SELECT 'PCВ-00135' AS 原始字符串,'PCB-00135' AS 半角B字符串,CASE WHEN 'PCВ-00135' = 'PCB-00135' THEN '相同'ELSE '不同'END AS 比较结果;

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-- 7. 检查是否为全角字符
-- 全角字符的Unicode范围通常是 0xFF01-0xFF5E
SELECT 'PCВ-00135' AS 原始字符串,CASE WHEN UNICODE('В') BETWEEN 0xFF01 AND 0xFF5E THEN '全角字符'WHEN UNICODE('В') BETWEEN 0x0020 AND 0x007E THEN '半角字符'ELSE '其他字符'END AS В字符类型,UNICODE('В') AS В的Unicode值;

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-- 8. 与标准ASCII字符比较
SELECT 'В' AS 原始字符,'B' AS 标准B字符,UNICODE('В') AS 原始字符Unicode,UNICODE('B') AS 标准B字符Unicode,ASCII('В') AS 原始字符ASCII,ASCII('B') AS 标准B字符ASCII;

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-- 9. 字符分类
SELECT 'PCВ-00135' AS 原始字符串,CASE WHEN UNICODE(SUBSTRING('PCВ-00135', 3, 1)) = 66 THEN '标准ASCII B'WHEN UNICODE(SUBSTRING('PCВ-00135', 3, 1)) = 1042 THEN '西里尔字母В'WHEN UNICODE(SUBSTRING('PCВ-00135', 3, 1)) = 65347 THEN '全角B'ELSE '其他字符'END AS 第3个字符类型;

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2、推荐使用方法

SQL Server版本（最简单）:

-- 直接替换
SELECT REPLACE('PCВ-00135', NCHAR(1042), 'B') AS 替换结果;-- 批量更新表
UPDATE YourTable 
SET YourColumn = REPLACE(YourColumn, NCHAR(1042), 'B');

C#版本（最灵活）:

// 简单替换
string result = "PCВ-00135".Replace("В", "B");// 使用工具类
string cleaned = CharacterCleaner.CleanCyrillicCharacters("PCВ-00135");

3、关键要点

准确识别: В 的Unicode值是1042，不是全角字符
高效替换: 使用 NCHAR(1042) 或 “\u0412” 进行精确替换
批量处理: 支持批量更新数据库表
性能优化: 提供了多种替换方法，可根据数据量选择

4、验证方法

-- 验证替换是否成功
SELECT 'PCВ-00135' AS 原始字符串,REPLACE('PCВ-00135', NCHAR(1042), 'B') AS 替换结果,CASE WHEN 'PCВ-00135' = REPLACE('PCВ-00135', NCHAR(1042), 'B') THEN '相同'ELSE '不同'END AS 比较结果;