Add DECIMAL constructor for Float literal.

DECIMAL constructor is used to pass a decimal number to the SQL query without precision loss.

internal/jet/literal_expression.go

@@ -140,7 +140,7 @@ type floatLiteral struct {
 	literalExpressionImpl
 }
 
-// Float creates new float literal
+// Float creates new float literal from float64 value
 func Float(value float64) FloatExpression {
 	floatLiteral := floatLiteral{}
 	floatLiteral.literalExpressionImpl = *literal(value)
@@ -150,6 +150,16 @@ func Float(value float64) FloatExpression {
 	return &floatLiteral
 }
 
+// Decimal creates new float literal from string value
+func Decimal(value string) FloatExpression {
+	floatLiteral := floatLiteral{}
+	floatLiteral.literalExpressionImpl = *literal(value)
+
+	floatLiteral.floatInterfaceImpl.parent = &floatLiteral
+
+	return &floatLiteral
+}
+
 //---------------------------------------------------//
 type stringLiteral struct {
 	stringInterfaceImpl

mysql/literal.go

@@ -42,9 +42,12 @@ var Uint32 = jet.Uint32
 // Uint64 is constructor for 64 bit unsigned integer expressions literals.
 var Uint64 = jet.Uint64
 
-// Float creates new float literal expression
+// Float creates new float literal expression from float64 value
 var Float = jet.Float
 
+// Decimal creates new float literal expression from string value
+var Decimal = jet.Decimal
+
 // String creates new string literal expression
 var String = jet.String
 

postgres/literal.go

@@ -38,6 +38,9 @@ var Uint64 = jet.Uint64
 // Float creates new float literal expression
 var Float = jet.Float
 
+// Decimal creates new float literal expression
+var Decimal = jet.Decimal
+
 // String creates new string literal expression
 var String = jet.String