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SQLGlot,一个气势恢宏的python库!

  • 2026-02-27 07:54:14
SQLGlot,一个气势恢宏的python库!

在数据平台迁移、多引擎支持或跨数据库开发的日常工作中,最令人头疼的莫过于处理各种SQL方言的差异。

Spark SQL的语法到了Presto就报错,DuckDB的日期函数在Snowflake里不兼容。

Python的SQLGlot模块正是为解决这一痛点而生,它是一款无依赖的SQL解析器、转译器和优化器,支持在31种不同SQL方言之间无缝转换。

无论是数据库迁移、跨平台开发还是SQL单元测试,SQLGlot都能让你的SQL代码“一次编写,处处运行”。

🚀 极简安装与基础转译

SQLGlot的安装非常简单,可以通过pip直接安装。它提供了核心解析功能和可选的Rust加速版本。

# 安装sqlglot(基础版本)!pip install sqlglotimport sqlglotprint(f"SQLGlot版本: {sqlglot.__version__}")print(f"支持方言数: {len(sqlglot.dialects.DIALECTS)}")

执行结果:

SQLGlot版本:25.30.0支持方言数:31核心特性:无依赖纯Python实现

🔄 跨方言SQL转换实战

SQLGlot的核心功能是方言转译。不同数据库的日期函数差异巨大,使用transpile方法可以轻松完成转换。

# DuckDB的时间函数转译为Hive语法duckdb_sql = "SELECT EPOCH_MS(1618088028295)"transpiled = sqlglot.transpile(duckdb_sql, read="duckdb", write="hive")[0]print(f"DuckDB原始SQL: {duckdb_sql}")print(f"Hive转译后: {transpiled}")# Spark SQL转译为Prestospark_sql = "SELECT DATE_FORMAT(date, 'yyyy-MM-dd') FROM table"presto_sql = sqlglot.transpile(spark_sql, read="spark", write="presto")[0]print(f"Spark转Presto: {presto_sql}")

执行结果:

DuckDB原始SQL: SELECT EPOCH_MS(1618088028295)Hive转译后: SELECT FROM_UNIXTIME(1618088028295 / POW(10, 3))Spark转Presto: SELECT DATE_FORMAT(date, '%Y-%m-%d') FROM table

🎯 表达式构建与动态SQL

除了转译,SQLGlot还支持程序化构建SQL。通过select和condition等辅助函数,可以动态生成复杂的查询语句。

from sqlglot import select, condition# 动态构建WHERE条件where_clause = condition("age > 18").and_("status = 'active'")sql = select("*").from_("users").where(where_clause).sql()print(f"动态构建SQL: {sql}")# 链式调用构建复杂查询complex_sql = select("name""COUNT(*) as cnt")\    .from_("orders")\    .where("amount > 100")\    .group_by("name")\    .having("cnt > 5")\    .sql(dialect="postgres")print(f"复杂查询: {complex_sql}")

执行结果:

动态构建SQL:SELECT * FROM users WHERE age > 18 AND status = 'active'复杂查询:SELECT name, COUNT(*) as cnt FROM orders WHERE amount > 100 GROUP BY name HAVING cnt > 5

🔍 AST解析与元数据提取

SQLGlot将SQL解析为抽象语法树(AST),通过遍历AST可以提取表名、列名等元数据,为数据血缘分析提供基础。

from sqlglot import parse_one, exp# 解析SQL并提取表名和列名sql = "SELECT a.id, b.name FROM table_a a JOIN table_b b ON a.id = b.ref_id"parsed = parse_one(sql)print("所有表引用:")for table in parsed.find_all(exp.Table):print(f"  - {table.name}")print("\n所有列引用:")for column in parsed.find_all(exp.Column):print(f"  - {column.table}.{column.name}")

执行结果:

所有表引用:  - table_a  - table_b所有列引用:  - a.id  - b.name  - a.id  - b.ref_id

🛠️ AST变换与SQL改写

SQLGlot允许对解析后的AST进行变换,实现SQL自动改写和优化。通过自定义转换函数,可以批量修改查询逻辑。

from sqlglot import parse_one, expsql = "SELECT a, b FROM original_table"parsed = parse_one(sql)# 定义变换函数:将所有列名转为大写deftransformer(node):ifisinstance(node, exp.Column):        node.args["this"] = exp.to_identifier(node.name.upper())return nodetransformed = parsed.transform(transformer)print(f"原始SQL: {sql}")print(f"变换后: {transformed.sql()}")

执行结果:

原始SQL:SELECT a, b FROM original_table变换后:SELECT A, B FROM original_table

⚖️ 优势对比分析与建议

相比sqlparse等纯分词工具,SQLGlot是真正的完整解析器,支持31种方言且提供AST操作能力。

相比Java系的Druid或JSqlParser,它轻量无依赖,适合Python生态。

但作为纯Python实现,解析速度不如C++编写的同类工具。

建议在需要跨数据库迁移、SQL血缘分析或动态SQL生成的场景中优先使用。

💬 结语互动

SQLGlot让SQL方言转换变得前所未有的简单。

你在数据库迁移或多引擎开发中遇到过哪些SQL兼容性问题?

有没有使用过其他SQL解析工具?欢迎在评论区分享你的经验和见解!

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  1. CONNECT:[ UseTime:0.000370s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000692s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000301s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000262s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000521s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000542s ]
  8. SELECT * FROM `article` WHERE `id` = 476522 LIMIT 1 [ RunTime:0.004300s ]
  9. UPDATE `article` SET `lasttime` = 1772246998 WHERE `id` = 476522 [ RunTime:0.006568s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000343s ]
  11. SELECT * FROM `article` WHERE `id` < 476522 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000706s ]
  12. SELECT * FROM `article` WHERE `id` > 476522 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009530s ]
  13. SELECT * FROM `article` WHERE `id` < 476522 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.041538s ]
  14. SELECT * FROM `article` WHERE `id` < 476522 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006485s ]
  15. SELECT * FROM `article` WHERE `id` < 476522 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016071s ]
0.156513s