Fetch and insert with host variables

If you try to fetch a value from a database column into a host variable that you do not declare according to the correspondence shown in Corresponding SQL and host variable data types, attempts to convert the data types. Similarly, if you try to insert a value from a host variable into a database column, might need to convert data types if the host variable and database column do not use the correspondences in Corresponding SQL and host variable data types. converts the data types only if the conversion is meaningful.