Execute ODBC functions

Use these handle types to execute ODBC functions.

SQLAllocHandle with SQL_HANDLE_STMT as the handle type

Allocates memory for information about an SQL statement.
- Application must request a statement handle prior to submitting SQL statements.
- Variable type HSTMT.
  In C, this statement is coded:
```
HSTMT hstmt;

rc = SQLAllocHandle(SQL_HANDLE_STMT, hdbc, &hstmt);
```

SQLExecDirect

Executes a preparable statement.
Fastest way to submit an SQL string for one time execution.
If rc is not equal to SQL_SUCCESS, the SQLGetDiagRec API can be used to find the cause of the error condition.
In C, this statement is coded:
```
SQLCHAR stmt[ ] = "CREATE TABLE NAMEID (ID INTEGER, NAME VARCHAR(50))";

rc = SQLExecDirect(hstmt, stmt, SQL_NTS);
```
Return code
- SQL_SUCCESS
- SQL_SUCCESS_WITH_INFO
- SQL_ERROR
- SQL_INVALID_HANDLE

SQLGetDiagRec

To retrieve error information for an error on a statement:

In C, this statement is coded:

SQLSMALLINT i = 1, cbErrorMsg ;
SQLCHAR    szSQLState[6], szErrorMsg[SQL_MAX_MESSAGE_LENGTH];
SQLINTEGER nativeError; 

rc = SQLGetDiagRec(SQL_HANDLE_STMT, hstmt, i, szSQLState, &nativeError, szErrorMsg, 
                                  SQL_MAX_MESSAGE_LENGTH, &cbErrorMsg);

szSQLState
- 5 character string
- 00000 = success
- 01004 = data truncated
- 07001 = wrong number of parameters
  Note: The previous items are only several of many possible SQL states.
fNativeError - specific to data source
szErrorMsg - Error Message text