MDAC 2.5 SDK - ODBC Programmer's Reference
Appendix D: Data Types
The identifiers for the year-month interval ODBC C data types are:
SQL_C_INTERVAL_MONTH
SQL_C_INTERVAL_YEAR
SQL_C_INTERVAL_YEAR_TO_MONTH
The following table shows the ODBC SQL data types to which year-month interval C data may be converted. For an explanation of the columns and terms in the table, see "Converting Data from C to SQL Data Types."
| SQL type identifier | Test | SQLSTATE |
| SQL_CHAR[a] SQL_VARCHAR[a] SQL_LONGVARCHAR[a] |
Column byte length >= Character byte length
Column byte length < Character byte length[a] Data value is not a valid interval literal |
n/a 22001 22015 |
| SQL_WCHAR[a] SQL_WVARCHAR[a] SQL_WLONGVARCHAR[a] |
Column character length >= Character length of data
Column character length < Character length of data[a] Data value is not a valid interval literal |
n/a 22001 22015 |
| SQL_TINYINT[b] SQL_SMALLINT[b] SQL_INTEGER[b] SQL_BIGINT[b] SQL_NUMERIC[b] SQL_DECIMAL[b] |
Conversion of a single-field interval did not result in truncation of whole digits
Conversion resulted in truncation of whole digits |
n/a 22003 |
| SQL_INTERVAL_MONTH SQL_INTERVAL_YEAR SQL_INTERVAL_YEAR_TO_MONTH |
Data value was converted without truncation of any fields
One or more fields of data value were truncated during conversion |
n/a 22015 |
[a] All C interval data types can be converted to a character data type.
[b] If the type field in the interval structure is such that the interval is a single field (SQL_YEAR or SQL_MONTH), the interval C type can be converted to any exact numeric (SQL_TINYINT, SQL_SMALLINT, SQL_INTEGER, SQL_BIGINT, SQL_DECIMAL, or SQL_NUMERIC).
The default conversion of an interval C type is to the corresponding year-month interval SQL type.
The driver ignores the length/indicator value when converting data from the interval C data type and assumes that the size of the data buffer is the size of the interval C data type. The length/indicator value is passed in the StrLen_or_Ind argument in SQLPutData and in the buffer specified with the StrLen_or_IndPtr argument in SQLBindParameter. The data buffer is specified with the DataPtr argument in SQLPutData and the ParameterValuePtr argument in SQLBindParameter.