Declare host variables in C and C++ applications that use SQL

The C and C++ precompilers recognize only a subset of valid C and C++ declarations as valid host variable declarations.

• Numeric host variables in C and C++ applications that use SQL
  The topic contains a figure showing the syntax for valid numeric host variable declarations.
• Character host variables in C and C++ applications that use SQL
  There are three valid forms for character host variables.
• Graphic host variables in C and C++ applications that use SQL
  There are three valid forms for graphic host variables.
• Binary host variables in C and C++ applications that use SQL
  C and C++ do not have variables that correspond to the SQL binary data types. To create host variables that can be used with these data types, use the SQL TYPE IS clause. The SQL precompiler replaces this declaration with a C language structure in the output source member.
• LOB host variables in C and C++ applications that use SQL
  C and C++ do not have variables that correspond to the SQL data types for LOBs (large objects). To create host variables that can be used with these data types, use the SQL TYPE IS clause. The SQL precompiler replaces this declaration with a C language structure in the output source member.
• ROWID host variables in C and C++ applications that use SQL
  C and C++ do not have a variable that corresponds to the SQL data type ROWID. To create host variables that can be used with this data type, use the SQL TYPE IS clause. The SQL precompiler replaces this declaration with a C language structure in the output source member.