1 files changed, 16 insertions, 36 deletions

diff --git a/libodbcpp/odbc-param.h b/libodbcpp/odbc-param.h
index 0981fe9..6ef5ae1 100644
--- a/libodbcpp/odbc-param.h
+++ b/libodbcpp/odbc-param.h
@@ -4,119 +4,99 @@
 #include <malloc.h>
 #include <sqlext.h>
 #include <glibmm/ustring.h>
-#include "odbc-bind.h"
+#include "odbc-param_fwd.h"
 #include <boost/date_time/posix_time/posix_time_types.hpp>
 
 namespace ODBC {
-	class Command;
-	class Param : public virtual Bind {
-		public:
-			Param();
-			Param(Command *, unsigned int idx);
-			virtual	~Param() = 0;
-			void bind() const;
-
-			virtual SQLSMALLINT stype() const = 0; // The SQL type ID
-			virtual SQLINTEGER dp() const = 0; // The decimal place count
-			virtual const void * dataAddress() const = 0; // The address of the data
-
-		protected:
-			friend class Column;
-			mutable Command * paramCmd;
-			mutable unsigned int paramIdx;
-			mutable bool paramBound;				// Has SqlBind(...) been called since last change of address?
-			SQLLEN dataLength;
-	};
-
 	class BooleanParam : public Param {
 		public:
 			BooleanParam() : Param() { }
-			BooleanParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			BooleanParam(Command * c, unsigned int i) : Param(c, i) { bindLen = BooleanParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_BIT; }
 			virtual SQLSMALLINT stype() const override { return SQL_C_BIT; }
 			virtual SQLULEN size() const override { return sizeof(SQLINTEGER); }
 			virtual SQLINTEGER dp() const override { return 0; }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const SQLINTEGER & d) { data = d; }
+			BooleanParam & operator=(const SQLINTEGER & d) { data = d; return *this; }
 		protected:
 			SQLINTEGER data;
 	};
 	class SignedIntegerParam : public Param {
 		public:
 			SignedIntegerParam() : Param() { }
-			SignedIntegerParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			SignedIntegerParam(Command * c, unsigned int i) : Param(c, i) { bindLen = SignedIntegerParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_LONG; }
 			virtual SQLSMALLINT stype() const override { return SQL_C_LONG; }
 			virtual SQLULEN size() const override { return sizeof(SQLINTEGER); }
 			virtual SQLINTEGER dp() const override { return 0; }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const SQLINTEGER & d) { data = d; }
+			SignedIntegerParam & operator=(const SQLINTEGER & d) { data = d; return *this; }
 		protected:
 			SQLINTEGER data;
 	};
 	class UnsignedIntegerParam : public Param {
 		public:
 			UnsignedIntegerParam() : Param() { }
-			UnsignedIntegerParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			UnsignedIntegerParam(Command * c, unsigned int i) : Param(c, i) { bindLen = UnsignedIntegerParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_ULONG; }
 			virtual SQLSMALLINT stype() const override { return SQL_C_ULONG; }
 			virtual SQLULEN size() const override { return sizeof(SQLUINTEGER); }
 			virtual SQLINTEGER dp() const override { return 0; }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const SQLUINTEGER & d) { data = d; }
+			UnsignedIntegerParam & operator=(const SQLUINTEGER & d) { data = d; return *this; }
 		protected:
 			SQLUINTEGER data;
 	};
 	class FloatingPointParam : public Param {
 		public:
 			FloatingPointParam() : Param() { }
-			FloatingPointParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			FloatingPointParam(Command * c, unsigned int i) : Param(c, i) { bindLen = FloatingPointParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_DOUBLE; }
 			virtual SQLSMALLINT stype() const override { return SQL_C_DOUBLE; }
 			virtual SQLULEN size() const override { return sizeof(SQLDOUBLE); }
 			virtual SQLINTEGER dp() const override { return 10; }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const SQLDOUBLE & d) { data = d; }
+			FloatingPointParam & operator=(const SQLDOUBLE & d) { data = d; return *this; }
 		protected:
 			SQLDOUBLE data;
 	};
 	class StdStringParam : public Param {
 		public:
 			StdStringParam() : Param() { }
-			StdStringParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			StdStringParam(Command * c, unsigned int i) : Param(c, i) { bindLen = StdStringParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_CHAR; }
 			virtual SQLSMALLINT stype() const override { return SQL_CHAR; }
 			virtual SQLULEN size() const override { return data.length(); }
 			virtual SQLINTEGER dp() const override { return 0; }
 			virtual const void * dataAddress() const override { return data.data(); }
-			void operator=(const std::string_view & d);
-			void operator=(const Glib::ustring & d);
+			StdStringParam & operator=(const std::string_view & d);
+			StdStringParam & operator=(const Glib::ustring & d);
 		protected:
 			std::string data;
 	};
 	class IntervalParam : public Param {
 		public:
 			IntervalParam() : Param() { }
-			IntervalParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			IntervalParam(Command * c, unsigned int i) : Param(c, i) { bindLen = IntervalParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_INTERVAL_DAY_TO_SECOND; }
 			virtual SQLSMALLINT stype() const override { return SQL_INTERVAL_DAY_TO_SECOND; }
 			virtual SQLULEN size() const override { return sizeof(SQL_INTERVAL_STRUCT); }
 			virtual SQLINTEGER dp() const override { return boost::posix_time::time_res_traits::num_fractional_digits(); }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const boost::posix_time::time_duration & d);
+			IntervalParam & operator=(const boost::posix_time::time_duration & d);
 		protected:
 			SQL_INTERVAL_STRUCT data;
 	};
 	class TimeStampParam : public Param {
 		public:
 			TimeStampParam() : Param() { }
-			TimeStampParam(Command * c, unsigned int i) : Param(c, i) { bindLen = size(); }
+			TimeStampParam(Command * c, unsigned int i) : Param(c, i) { bindLen = TimeStampParam::size(); }
 			virtual SQLSMALLINT ctype() const override { return SQL_C_TYPE_TIMESTAMP; }
 			virtual SQLSMALLINT stype() const override { return SQL_TYPE_TIMESTAMP; }
 			virtual SQLULEN size() const override { return sizeof(SQL_TIMESTAMP_STRUCT); }
 			virtual SQLINTEGER dp() const override { return boost::posix_time::time_res_traits::num_fractional_digits(); }
 			virtual const void * dataAddress() const override { return &data; }
-			void operator=(const boost::posix_time::ptime & d);
+			TimeStampParam & operator=(const boost::posix_time::ptime & d);
 		protected:
 			SQL_TIMESTAMP_STRUCT data;
 	};