Postgresql 中文操作指南

DESCRIBE

DESCRIBE — 获取有关准备好的语句或结果集的信息

DESCRIBE — obtain information about a prepared statement or result set

Synopsis

DESCRIBE [ OUTPUT ] prepared_name USING [ SQL ] DESCRIPTOR descriptor_name
DESCRIBE [ OUTPUT ] prepared_name INTO [ SQL ] DESCRIPTOR descriptor_name
DESCRIBE [ OUTPUT ] prepared_name INTO sqlda_name

Description

DESCRIBE 检索准备好的语句中包含的结果列的元数据信息，而无需实际获取行。

DESCRIBE retrieves metadata information about the result columns contained in a prepared statement, without actually fetching a row.

Parameters

prepared_name #
- The name of a prepared statement. This can be an SQL identifier or a host variable.
descriptor_name #
- A descriptor name. It is case sensitive. It can be an SQL identifier or a host variable.
sqlda_name #
- The name of an SQLDA variable.

Examples

EXEC SQL ALLOCATE DESCRIPTOR mydesc;
EXEC SQL PREPARE stmt1 FROM :sql_stmt;
EXEC SQL DESCRIBE stmt1 INTO SQL DESCRIPTOR mydesc;
EXEC SQL GET DESCRIPTOR mydesc VALUE 1 :charvar = NAME;
EXEC SQL DEALLOCATE DESCRIPTOR mydesc;

Compatibility

DESCRIBE 在 SQL 标准中指定。

DESCRIBE is specified in the SQL standard.