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SQL to C Data Conversion Examples

  • Článek

The examples shown in the following table illustrate how the driver converts SQL data to C data :

SQL type

identifier		 SQL data

value		 C type

identifier		 Buffer

length		 *TargetValuePtr SQLSTATE
SQL_CHAR abcdef SQL_C_CHAR 7 abcdef\0[a] n/a
SQL_CHAR abcdef SQL_C_CHAR 6 abcde\0[a] 01004
SQL_DECIMAL 1234.56 SQL_C_CHAR 8 1234.56\0[a] n/a
SQL_DECIMAL 1234.56 SQL_C_CHAR 5 1234\0[a] 01004
SQL_DECIMAL 1234.56 SQL_C_CHAR 4 ---- 22003
SQL_DECIMAL 1234.56 SQL_C_FLOAT ignored 1234.56 n/a
SQL_DECIMAL 1234.56 SQL_C_SSHORT ignored 1234 01S07
SQL_DECIMAL 1234.56 SQL_C_STINYINT ignored ---- 22003
SQL_DOUBLE 1.2345678 SQL_C_DOUBLE ignored 1.2345678 n/a
SQL_DOUBLE 1.2345678 SQL_C_FLOAT ignored 1.234567 n/a
SQL_DOUBLE 1.2345678 SQL_C_STINYINT ignored 1 n/a
SQL_TYPE_DATE 1992-12-31 SQL_C_CHAR 11 1992-12-31\0[a] n/a
SQL_TYPE_DATE 1992-12-31 SQL_C_CHAR 10 ----- 22003
SQL_TYPE_DATE 1992-12-31 SQL_C_TIMESTAMP ignored 1992,12,31, 0,0,0,0[b] n/a
SQL_TYPE_TIMESTAMP 1992-12-31 23:45:55.12 SQL_C_CHAR 23 1992-12-31 23:45:55.12\0[a] n/a
SQL_TYPE_TIMESTAMP 1992-12-31 23:45:55.12 SQL_C_CHAR 22 1992-12-31 23:45:55.1\0[a] 01004
SQL_TYPE_TIMESTAMP 1992-12-31 23:45:55.12 SQL_C_CHAR 18 ---- 22003

[a] "\0" represents a null-termination byte. The driver always null-terminates SQL_C_CHAR data.

[b] The numbers in this list are the numbers stored in the fields of the TIMESTAMP_STRUCT structure.