stmt

Documentation

Index

• func FromContext(ctx context.Context, query string) (*sql.Stmt, bool)
• func Query(s *sql.Stmt) string
• func WithContext(ctx context.Context, stmt *sql.Stmt) context.Context

Functions

func FromContext

func FromContext(ctx context.Context, query string) (*sql.Stmt, bool)

FromContext retrieves a SQL statement from the context chain that matches the given query. It performs a recursive search through the context chain until it finds a matching statement or reaches the end of the chain.

Note: It prevents infinite recursion by checking for self-referential contexts.

func Query

func Query(s *sql.Stmt) string

Query extracts the SQL query string from a *sql.Stmt using unsafe pointer arithmetic.

How it works: 1. sql.Stmt struct memory layout (only relevant fields):

• First field (*DB): 8 bytes (on 64-bit systems)

• Second field (query string): 16 bytes <- we want this

2. To get the query string, we:

a. Start at the beginning of the struct (sql.Stmt)
b. Skip the first field (8 bytes) to reach query string
c. Read the string value

Note: This implementation relies on the internal structure of sql.Stmt and may break if the struct layout changes in future Go versions.

func WithContext

func WithContext(ctx context.Context, stmt *sql.Stmt) context.Context

WithContext creates a new context containing the provided SQL statement. It maintains a chain of contexts, allowing for statement reuse and lookup.