Rediger

Del via

C to SQL: Date

  • Artikkel

The identifier for the date ODBC C data type is:

SQL_C_TYPE_DATE

The following table shows the ODBC SQL data types to which date 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

SQL_VARCHAR

SQL_LONGVARCHAR		 Column byte length >= 10

Column byte length < 10

Data value is not a valid date		 n/a

22001

22008
SQL_WCHAR

SQL_WVARCHAR

SQL_WLONGVARCHAR		 Column character length >= 10

Column character length < 10

Data value is not a valid date		 n/a

22001

22008
SQL_TYPE_DATE Data value is a valid date

Data value is not a valid date		 n/a

22007
SQL_TYPE_TIMESTAMP Data value is a valid date[a]

Data value is not a valid date		 n/a

22007

[a] The time portion of the timestamp is set to zero.

For information about what values are valid in a SQL_C_TYPE_DATE structure, see C Data Types, earlier in this appendix.

When date C data is converted to character SQL data, the resulting character data is in the "yyyy-mm-dd" format.

The driver ignores the length/indicator value when converting data from the date C data type and assumes that the size of the data buffer is the size of the date 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.