Function parse 

pub fn parse(
    name: &str,
    query: &str,
    param_types: &[Oid],
    buf: &mut BytesMut,
) -> Result<()>

Writes a parse message (prepare statement).

Prepares a SQL statement for later execution. The server responds with ParseComplete and may send ParameterDescription.

Arguments

• name - Statement name (null-terminated, empty string for unnamed)
• query - SQL query string with parameter placeholders ($1, $2, etc.)
• param_types - OIDs of parameter types (empty if types should be inferred)
• buf - Buffer to write the message to

Errors

Currently infallible — always returns Ok(()). The io::Result return type is preserved for forward compatibility.

Panics

• Panics via msg_len if name.len(), query.len(), or the encoded message length exceeds i32::MAX bytes.
• Panics via msg_count if param_types.len() exceeds u16::MAX (65 535). PostgreSQL caps parameters per query at 1 600, so overflow is a programming error.