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The Connect XE Drivers : The Impala Wire Protocol Driver : Connection Option Descriptions : String Describe Type
 

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String Describe Type

Attribute

StringDescribeType (SDT)

Purpose

Specifies whether all string columns are described as SQL_VARCHAR. This connection option affects SQL_Columns, SQLDescribeCol, SQLColAttributes, etc.  It does not affect SQLGetTypeInfo.

Valid Values

-10 | -9

Behavior

If set to -10 (SQL_WLONGVARCHAR), all string columns are described as SQL_WLONGVARCHAR.
If set to -9 - (SQL_WVARCHAR), all string columns are described as SQL_WVARCHAR.

Default

-9 - SQL_WVARCHAR

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