teradata-latin
Teradata LATIN 字符集中文编解码组件（纯标准库，零依赖）。
问题背景
Teradata 的 LATIN 字符集列中常见以 GBK 编码存储的中文（历史 ETL 通过
CLIENT_CHARSET=GBK 的 JDBC 会话直通写入）。使用官方纯 Python 驱动
teradatasql（固定 UTF-8 会话、
不支持 charset 参数）读取时，服务端按 Teradata LATIN 代码页逐字节映射
Unicode，落在 0x80-0x9F / 0xD0-0xFE 等区间的 GBK 字节会被映射为不同
码位（如 0xD0 -> U+00F0、0xDE -> U+00FE、0xD7 -> U+0152、
0xF7 -> U+0153、0xB8 -> U+0160），中文变成乱码。
tdlatin 提供与生产 JDBC（CHARSET=GBK）等价的转换：
- 读取方向：乱码字符 -> 原始字节（Teradata LATIN 映射）-> GBK 解码 = 正确中文
- 写入/过滤方向：正确中文 -> GBK 字节 -> Teradata LATIN 映射字符，
嵌入 SQL 字面量后由服务端
UNICODE_TO_LATIN转回原始字节，比较语义与生产一致
安装
pip install teradata-latin
用法
import teradatasql
from teradata_latin import decode_td_latin, encode_td_latin
con = teradatasql.connect(host='...', user='...', password='...')
# 1) 读出中文列 -> 还原
cur = con.cursor()
cur.execute("SELECT TOP 5 Client_CN_Name FROM pv_pmart.DIM_CLIENT_BASE_INFO")
for (name,) in cur.fetchall():
print(decode_td_latin(name)) # '某国际货运代理有限公司'
# 2) SQL 中文字面量 / 中文参数 -> 编码后嵌入
lit = encode_td_latin('0未逾期')
cur.execute("SELECT count(1) FROM t WHERE AR_Overdue_Mth IN ('%s','')" % lit)
name = encode_td_latin('某工业环保设备有限公司')
cur.execute("SELECT Client_id FROM t WHERE Client_CN_Name = '%s'" % name)
API
| 函数 | 说明 |
|---|---|
decode_td_latin(text, errors='replace') |
读出乱码 -> 正确中文；无法映射时安全原样返回（或 errors='strict' 抛错） |
encode_td_latin(text, errors='strict') |
中文 -> SQL 字面量；GBK 不可编码字符可 errors='replace' |
TDLatinCoder |
面向对象封装（decode / encode） |
映射表可通过 TDBYTE_TO_UNICODE / UNICODE_TO_TDBYTE / DRIFT_BYTE_COUNT
访问（196 个实测字节，18 个与标准 Latin-1 不一致）。
映射表来源
多张线上业务表（订单/客户/财务/营收/逾期）共 9000+ 行采样 + Teradata
UNICODE_TO_LATIN / LATIN_TO_UNICODE 服务端往返实验验证，确定性一一映射，
无冲突；漂移字节全部通过服务端往返校验。
License
MIT
1 maintainer
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