Field	Description
sqldaid	An 8-byte character field that contains the string SQLDA as an identification of the SQLDA structure. This field helps in debugging when you are looking at memory contents.
sqldabc	A 32-bit integer containing the length of the SQLDA structure.
sqln	The number of variable descriptors allocated in the sqlvar array.
sqld	The number of variable descriptors that are valid (contain information describing a host variable). This field is set by the DESCRIBE statement. As well, you can set it when supplying data to the database server.
sqlvar	An array of descriptors of type struct sqlvar, each describing a host variable.