Sqlparse Seem Like Can't Format DDL Sql

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Describe the Bug

The sqlparse library in Python seems to have an issue with formatting DDL (Data Definition Language) SQL statements correctly. When using the sqlparse.format() function with the reindent=True and keyword_case='upper' parameters, it fails to properly format the SQL statement, resulting in an incorrectly indented and formatted output.

To Reproduce

Step 1: Install the Required Libraries

First, ensure you have the sqlparse library installed in your Python environment. You can install it using pip:

pip install sqlparse

Step 2: Create a Sample DDL SQL Statement

Create a sample DDL SQL statement that includes a CREATE TABLE statement with various columns and constraints:

CREATE TABLE t_user_gs_hsakjhkj (
    id int AUTO_INCREMENT NOT NULL COMMENT '主键',
    create_time datetime NOT NULL COMMENT '创建时间' DEFAULT CURRENT_TIMESTAMP,
    update_time datetime COMMENT '更新时间' DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    t_user_id int NOT NULL COMMENT '用户表主键id',
    occupation_id varchar(225) NOT NULL COMMENT 'occupation_id',
    service_order_id varchar(225) NOT NULL COMMENT '订单id',
    PRIMARY KEY (id),
    UNIQUE INDEX un_t_user_idx (t_user_id)
);

Step 3: Use sqlparse to Format the SQL Statement

Use the sqlparse.format() function to format the SQL statement with the reindent=True and keyword_case='upper' parameters:

import sqlparse

sql = """
CREATE TABLE t_user_gs_hsakjhkj (
    id int AUTO_INCREMENT NOT NULL COMMENT '主键',
    create_time datetime NOT NULL COMMENT '创建时间' DEFAULT CURRENT_TIMESTAMP,
    update_time datetime COMMENT '更新时间' DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    t_user_id int NOT NULL COMMENT '用户表主键id',
    occupation_id varchar(225) NOT NULL COMMENT 'occupation_id',
    service_order_id varchar(225) NOT NULL COMMENT '订单id',
    PRIMARY KEY (id),
    UNIQUE INDEX un_t_user_idx (t_user_id)
);
"""

print(sqlparse.format(sql, reindent=True, keyword_case='upper'))

Step 4: Observe the Incorrectly Formatted Output

Run the code and observe the output. The SQL statement is not formatted correctly, resulting in an incorrectly indented and formatted output.

Expected Behavior

The sqlparse.format() function should correctly format the DDL SQL statement with the reindent=True and keyword_case='upper' parameters, resulting in a properly indented and formatted output.

Versions

  • Python: 3.10.7
  • sqlparse: 0.5.3

Additional Context

The sqlparse library is a powerful tool for parsing and formatting SQL statements in Python. However, it seems to have an issue with formatting DDL SQL statements correctly. This bug can be reproduced using the steps outlined above.

Workaround

One possible workaround for this issue is to use a different library or tool for formatting SQL statements, such as the sql-formatter library. Alternatively, you can manually format the SQL statement using a text editor or IDE.

Q: What is the sqlparse library and what is its purpose?

A: The sqlparse library is a Python library that provides a powerful tool for parsing and formatting SQL statements. Its purpose is to help developers and data analysts to write, read, and maintain SQL code more efficiently.

Q: What is the issue with sqlparse and DDL SQL statements?

A: The issue with sqlparse is that it fails to properly format DDL SQL statements, resulting in an incorrectly indented and formatted output. This can make it difficult for developers and data analysts to read and maintain SQL code.

Q: What are the symptoms of this issue?

A: The symptoms of this issue include:

  • Incorrect indentation of SQL statements
  • Incorrect formatting of SQL statements
  • Difficulty reading and maintaining SQL code

Q: How can I reproduce this issue?

A: You can reproduce this issue by following the steps outlined in the "To Reproduce" section of the original article.

Q: What are the possible causes of this issue?

A: The possible causes of this issue include:

  • Incompatible versions of sqlparse and Python
  • Incorrect usage of sqlparse functions
  • Bugs in the sqlparse library

Q: How can I fix this issue?

A: There are several ways to fix this issue, including:

  • Upgrading to a newer version of sqlparse
  • Downgrading to a previous version of sqlparse
  • Using a different library or tool for formatting SQL statements
  • Manually formatting SQL statements using a text editor or IDE

Q: What are the alternatives to sqlparse for formatting SQL statements?

A: Some alternatives to sqlparse for formatting SQL statements include:

  • sql-formatter: A Python library for formatting SQL statements
  • sqlparse2: A fork of the sqlparse library with improved formatting capabilities
  • sqlformat: A command-line tool for formatting SQL statements

Q: Can I report this issue to the sqlparse developers?

A: Yes, you can report this issue to the sqlparse developers by opening an issue on the sqlparse GitHub repository.

Q: How can I prevent this issue from occurring in the future?

A: You can prevent this issue from occurring in the future by:

  • Keeping your sqlparse library up to date
  • Using a different library or tool for formatting SQL statements
  • Manually formatting SQL statements using a text editor or IDE

Conclusion The sqlparse library in Python has an issue with formatting DDL SQL statements correctly. This bug can be reproduced using the steps outlined above. A workaround for this issue is to use a different library or tool for formatting SQL statements.