SQL to C: Date
The identifier for the date ODBC SQL data type is:
SQL_TYPE_DATE
The following table shows the ODBC C data types to which date SQL data may be converted. For an explanation of the columns and terms in the table, see Converting Data from SQL to C Data Types.
| C type identifier | Test | *TargetValuePtr | *StrLen_or_IndPtr | SQLSTATE |
|---|---|---|---|---|
| SQL_C_CHAR | BufferLength > Character byte length 11 <= BufferLength <= Character byte length BufferLength < 11 |
Data Truncated data Undefined |
10 Length of data in bytes Undefined |
n/a 01004 22003 |
| SQL_C_WCHAR | BufferLength > Character length 11 <= BufferLength <= Character length BufferLength < 11 |
Data Truncated data Undefined |
10 Length of data in characters Undefined |
n/a 01004 22003 |
| SQL_C_BINARY | Byte length of data <= BufferLength Byte length of data > BufferLength |
Data Undefined |
Length of data in bytes Undefined |
n/a 22003 |
| SQL_C_TYPE_DATE | None[a] | Data | 6[c] | n/a |
| SQL_C_TYPE_TIMESTAMP | None[a] | Data[b] | 16[c] | n/a |
[a] The value of BufferLength is ignored for this conversion. The driver assumes that the size of *TargetValuePtr is the size of the C data type.
[b] The time fields of the timestamp structure are set to zero.
[c] This is the size of the corresponding C data type.
When date SQL data is converted to character C data, the resulting string is in the "yyyy-mm-dd" format. This format is not affected by the Windows country/region setting.