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valores null:
set to true if you want to return blob columns in a file, false if you want them in memory. you can override the setting at runtime with ifx_blobinfile_mode().

se suministró un valor de cadena null.
null 문자열값을 공급받습니다.

esto permite distinguir entre columnas null y vacías.
set to true if you want to return byte columns as normal strings in select queries, false if you want to use blob id parameters. you can override the setting at runtime with ifx_textasvarchar().

actualmente pueden ser, "not null", "primary key", una combinación de ambos, o "" (cadena vacía).
msql_fieldflags() returns the field flags of the specified field. currently this is either, "not null ", "primary key", a combination of the two or ""(an empty string).