2024年1月9日 · SQLGetDescField can be used to query the new IRD field SQL_CA_SS_IS_COLUMN_SET to determine if a column is a column_set column. For more information, see Sparse Columns Support (ODBC).

2024年6月25日 · The SQLSetDescRec function sets a variety of fields that affect the data type and buffer bound to a column or parameter (the SQL_DESC_TYPE, SQL_DESC_DATETIME_INTERVAL_CODE, SQL_DESC_OCTET_LENGTH, SQL_DESC_PRECISION, SQL_DESC_SCALE, SQL_DESC_DATA_PTR, SQL_DESC_OCTET_LENGTH_PTR, and SQL_DESC_INDICATOR_PTR fields).

本文介绍了BIRD，一个英语大规模跨领域的文本到SQL基准测试，特别关注大型数据库内容。 BIRD通过探索三个额外的挑战：1）处理大型和脏数据库值，2）外部知识推理，以及3）优化SQL执行效率，缩小了文本到SQL研究和实际应用之间的差距。

The fields of an IRD have a default value only after the statement has been prepared or executed and the IRD has been populated, not when the statement handle or descriptor has been allocated. Until the IRD has been populated, any attempt to gain access to …

The Microsoft® SQL Server™ ODBC driver exposes driver-specific descriptor fields for the implementation row descriptor (IRD) only. Within the IRD, SQL Server descriptor fields are referenced through driver-specific column attributes.

2017年1月10日 · Section 3.9.4.1 (Retrieving Dynamic Columns) states: If the type and length information changes on subsequent rows, the driver may return SQL_METADATA_CHANGED based on the SQL_ATTR_TYPE_EXCEPTION_BEHAVIOR. Alternatively, the driver may create additional IRD records with the same name for dynamic columns of different types.

2024年12月17日 · SQLDescribeCol returns a fixed set of descriptor information based on ANSI-89 SQL. SQLColAttribute allows access to the more extensive set of descriptor information available in ANSI SQL-92 and DBMS vendor extensions.

2024年10月17日 · Implementation Row Descriptor (IRD). Contains information about the columns in a result set, such as their SQL data types, lengths, and nullability. Four descriptors (one filling each role) are allocated automatically when a statement is allocated. These are known as automatically allocated descriptors and are always associated with that statement.

After I get the SCVs, I make a quick Visualization using a DataViz of my choice. This project covers the important Real World SQL questions that usually come to interviews. I answer …

There are four automatic desc s; here’s a brief description of each: IRD, or Implementation Row Descriptor. Its usual use: to find out what the DBMS knows about a result set. The IRD is filled in when you call SQLPrepare for a SELECT statement. ARD, or Application Row Descriptor.