integer data type selection by sizing should be fixed

[rafiulgits]

sqlserver/sqlserver.go

Line 158 in 3c16210

switch {

SQL Server datatype selection based on int value data size is not appropriate. Here is the condition

switch {
case field.Size < 16:
	sqlType = "smallint"
case field.Size < 31:
	sqlType = "int"
default:
	sqlType = "bigint"
}

Golang integers

• int8 : 1 byte or 8 bits
• int16: 2 bytes or 16 bits
• int32: 3 bytes or 32 bits
• int64 4 bytes or 64 bits`

SQL Server integers equivalent

• tinyint : int8
• smallint : int16
• int : int32
• biging : int64

The condition should be

switch {
case field.Size < 16:
	sqlType = "tinyint"
case field.Size < 31:
	sqlType = "smallint"
case field.Size < 64:
	sqlType = "int"
default:
	sqlType = "bigint"
}

[rafiulgits]

I have created a pull request #53