SPI_GETARGTYPEID(3)

💖 SPI_GETARGTYPEID 💖

okay bestie, so this one's from the PostgreSQL 18.6 Documentation — it's SPI_GETARGTYPEID(3), section 3 of the manual, and it's genuinely one of the shorter ones so we can absolutely devour this together ✨

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✨ NAME ✨

SPI_getargtypeid — returns the data type OID for an argument of a statement prepared by SPI_prepare 🎀

like. it tells you what type one of your args is. that's the whole job. iconic of it honestly.

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🌸 SYNOPSIS 🌸

Oid SPI_getargtypeid(SPIPlanPtr plan, int argIndex)

look at her. two params. no drama. 💅

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🦋 DESCRIPTION 🦋

so SPI_getargtypeid returns the Oid that represents the type for the argIndex'th argument of a statement that was prepared by SPI_prepare 🫶

and watch out — the first argument is at index zero. zero-based indexing, no cap. that's just how she runs 😭

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🌈 ARGUMENTS 🌈

• SPIPlanPtr plan — the prepared statement, i.e. the thing that got handed back to you by SPI_prepare 🎀
• int argIndex — the zero based index of the argument 👑 yes. zero. not one. zero. i will not be repeating myself (i will be repeating myself).

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💜 RETURN VALUE 💜

you get back the type OID of the argument sitting at the index you asked for. slay ✨

but if the plan is NULL or invalid, or if argIndex is less than 0 or not less than the number of arguments declared for the plan, then SPI_result gets set to SPI_ERROR_ARGUMENT and InvalidOid is returned 💀

so basically: bad index or bad plan → you get the error code set and InvalidOid handed to you instead of an actual answer. check your stuff, bestie 🙈

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lowkey just always check SPI_result after this one. it's giving "trust but verify" and honestly the verify part is doing all the work 💅

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and that's the whole page fr fr 💖 that was SPI_getargtypeid from the PostgreSQL 18.6 Documentation, dated 2026, living in section SPI_GETARGTYPEID(3). go forth and index responsibly, queen 👑🌸