How Can I Retrieve the Raw Compiled SQL from a SQLAlchemy Expression?

Retrieving Raw, Compiled SQL from SQLAlchemy Expressions

In SQLAlchemy, obtaining the raw, compiled SQL query from an expression object can be a challenge. While the expression API offers a convenient interface, it makes the underlying SQL hidden from view.

Struggling to Locate Parameters

You have inspected the query._params dictionary but found it empty, despite the query executing successfully. This is because SQLAlchemy intentionally keeps the parameters encapsulated in the query object. By doing so, it ensures compatibility with various DB-APIs.

Using Literal Binding

However, the SQLAlchemy documentation offers a workaround through the use of literal_binds:

print(q.statement.compile(compile_kwargs={"literal_binds": True}))

This approach allows you to print the query statement with its parameters included. However, it is only suitable for basic types (e.g., integers, strings) and does not support bindparam() without a predefined value.

Security Caution

The documentation strongly advises against using this technique with untrusted input. SQLAlchemy's type coercion mechanisms are not foolproof and could lead to security vulnerabilities.

Conclusion

While not directly exposed by default, the raw, compiled SQL can be retrieved from SQLAlchemy expressions using the literal_binds keyword argument. However, it is crucial to exercise caution when working with untrusted data.

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