---
name: "mariadb_dyncol_unpack"
section: "3"
platform: "linux"
package: "mariadb"
version: "13.0.2-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/mariadb_dyncol_unpack"
---

# mariadb\_dyncol\_unpack(3)

### Name

mariadb\_dyncol\_unpack - extracts keys and values of all columns

### Synopsis

-

  ```
  #include <mariadb_dyncol.h>
  enum enum_dyncol_func_result
  mariadb_dyncol_unpack(DYNAMIC_COLUMN *str,
                        uint *column_count,
                        MYSQL_LEX_STRING **column_keys,
                        DYNAMIC_COLUMN_VALUE **values);
  ```

### Description

The `mariadb_dyncol_unpack()` function extracts all keys and values of a dynamic column.

### Parameter

- •

  `str` - Pointer to a `DYNAMIC_COLUMN` structure

- •

  `column count` - Pointer to an unsigned integer which will receive the number of columns

- •

  `column_keys` - Pointer of an array of `MYSQL_LEX_STRING` structures, which will contain the column keys

- •

  `values` - Pointer of an array of `DYNAMIC_COLUMN_VALUE` structures, which will contain the values.

### Return value

Returns `ER_DYNCOL_OK` on success, otherwise an error.

### Notes

- •

  The `column_keys` and `values` arrays will be allocated by `mariadb_dyncol_unpack()` and must be freed by application.

### See also

- •

  **mariadb\_dyncol\_get(3)**

- •

  **mariadb\_dyncol\_list(3)**