> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/15/server-programming/server-programming-interface/spi-interface-support/spi-spi-getbinval.md).

# SPI\_getbinval

## SPI\_getbinval

SPI\_getbinval — return the binary value of the specified column

### Synopsis

```

Datum SPI_getbinval(HeapTuple row, TupleDesc rowdesc, int colnumber,
                    bool * isnull)
```

### Description

`SPI_getbinval` returns the value of the specified column in the internal form (as type `Datum`).

This function does not allocate new space for the datum. In the case of a pass-by-reference data type, the return value will be a pointer into the passed row.

### Arguments

`HeapTuple`` `*`row`*

input row to be examined

`TupleDesc`` `*`rowdesc`*

input row description

`int`` `*`colnumber`*

column number (count starts at 1)

`bool *`` `*`isnull`*

flag for a null value in the column

### Return Value

The binary value of the column is returned. The variable pointed to by *`isnull`* is set to true if the column is null, else to false.

`SPI_result` is set to `SPI_ERROR_NOATTRIBUTE` on error.

***

原文：[PostgreSQL 15.19 Documentation](/15/server-programming/server-programming-interface/spi-interface-support/spi-spi-getbinval.md)（英文原文，待翻譯）


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