readme, null terminator modified and 2GB spported

Author: akhilravuri1

column.go

@@ -28,8 +28,13 @@ func (l *BufferLen) GetData(h api.SQLHSTMT, idx int, ctype api.SQLSMALLINT, buf
 }
 
 func (l *BufferLen) Bind(h api.SQLHSTMT, idx int, ctype api.SQLSMALLINT, buf []byte) api.SQLRETURN {
+	if len(buf) <= 2147483647 {
+		return api.SQLBindCol(h, api.SQLUSMALLINT(idx+1), ctype,
+			buf, api.SQLLEN(len(buf)),
+			(*api.SQLLEN)(l))
+	}
 	return api.SQLBindCol(h, api.SQLUSMALLINT(idx+1), ctype,
-		buf, api.SQLLEN(len(buf)),
+		buf, api.SQLLEN(len(buf)-1),
 		(*api.SQLLEN)(l))
 }
 
@@ -235,10 +240,10 @@ func NewVariableWidthColumn(b *BaseColumn, ctype api.SQLSMALLINT, colWidth api.S
 	l := int(colWidth)
 	switch ctype {
 	case api.SQL_C_WCHAR, api.SQL_C_DBCHAR:
-		//l += 1 // room for null-termination character
+		l++    // room for null-termination character
 		l *= 2 // wchars take 2 bytes each
 	case api.SQL_C_CHAR:
-		//l += 1 // room for null-termination character
+		l++ // room for null-termination character
 	case api.SQL_C_BINARY:
 		// nothing to do
 	default:

installer/setup.go

@@ -79,13 +79,17 @@ func linux_untar(clidriver string, targetDirectory string) error {
 func main() {
 	var target, cliFileName string
 	var unpackageType int
-	_, errDir := os.LookupEnv("IBM_DB_DIR")
-	_, errHome := os.LookupEnv("IBM_DB_HOME")
-	_, errLib := os.LookupEnv("IBM_DB_LIB")
-
-	if errDir || errHome || errLib {
-		fmt.Printf("Failed to fetch environment variables.")
-		os.Exit(1)
+	value, errDir := os.LookupEnv("DB2HOME")
+	if errDir {
+		if runtime.GOOS == "windows" {
+			fmt.Println("clidriver is already present in this path ", value)
+			fmt.Println("Please add this path to PATH environment variable")
+			os.Exit(1)
+		} else {
+			fmt.Println("clidriver is already present in this path ", value)
+			fmt.Println("Please set CGO_CFLAGS, CGO_LDFLAGS and LD_LIBRARY_PATH or DYLD_LIBRARY_PATH environment variables")
+			os.Exit(1)
+		}
 	}
 	if len(os.Args) == 2 {
 		target = os.Args[1]