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Rechercher dans le manuel MySQL

28.7.7.43 mysql_list_fields()

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MYSQL_RES *mysql_list_fields(MYSQL *mysql, const char *table, const char *wild)

Description
Note

mysql_list_fields() is deprecated and will be removed in a future version of MySQL. Instead, use mysql_query() to execute a SHOW COLUMNS statement.

Returns an empty result set for which the metadata provides information about the columns in the given table that match the simple regular expression specified by the wild parameter. wild may contain the wildcard characters % or _, or may be a NULL pointer to match all fields. Calling mysql_list_fields() is similar to executing the query SHOW COLUMNS FROM tbl_name [LIKE wild].

It is preferable to use SHOW COLUMNS FROM tbl_name instead of mysql_list_fields().

You must free the result set with mysql_free_result().

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Return Values

A MYSQL_RES result set for success. NULL if an error occurred.

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Errors

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Example
int i;
MYSQL_RES *tbl_cols = mysql_list_fields(mysql, "mytbl", "f%");

unsigned int field_cnt = mysql_num_fields(tbl_cols);
printf("Number of columns: %d\n", field_cnt);

for (i=0; i < field_cnt; ++i)
{
  /* col describes i-th column of the table */
  MYSQL_FIELD *col = mysql_fetch_field_direct(tbl_cols, i);
  printf ("Column %d: %s\n", i, col->name);
}
mysql_free_result(tbl_cols);

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Document created the 26/06/2006, last modified the 26/10/2018
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References

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