In a C UDR, you declare variables to hold information just as you would in a C function. The DataBlade API provides many data types for variable declaration. The DataBlade API prepends special prefixes to the names of its data types, as the following table shows.
| DataBlade API Data Type | Data Type Prefix | More Information |
|---|---|---|
| Data types to hold SQL data types | mi_ | Table 4 |
| Data type structures that hold information for DataBlade API functions | MI_ | Table 7 |
Table 5 lists where in this manual each of the SQL data types is discussed in detail.
Use the DataBlade API data types for variable declaration in your C UDR even if there is a C-language equivalent. The DataBlade API data types are more portable if your C UDR moves to different computer architectures. For more information, see DataBlade API Data Types.
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