update readme file

README.md

@@ -559,13 +559,32 @@ complete code for mapping refcursor to sql.Rows is found in [example/refcursor_t
   // rest of your code
 ```
 
+* ### Session Parameters
+  * you can update session parameter after connection as follow
+  ```golang
+  db, err := sql.Open("oracle", connStr)
+  if err != nil {
+    // error handling
+  }
+  // pass database, key, value
+  err = go_ora.AddSessionParameter(db, "nls_language", "english")
+  if err != nil {
+    // error handling
+  }
+  ```
 [//]: # (### Go and Oracle type mapping + special types)
 
 [//]: # ()
 [//]: # (### Supported DBMS features)
 ### releases
 <details>
 
+### version 2.7.20
+* fix time not in timezone issue specially with oracle 19c
+* add function to set value for session parameters that will be applied for subsequent connections
+* fix issue #461
+* bug fixes and improvements
+
 ### version 2.7.18
 * Add 2 function `go_ora.NewDriver` and `go_ora.NewConnector`
 * Add new function `go_ora.SetStringConverter` which accept custom converter for unsupported charset and nCharset

v2/driver.go

@@ -72,7 +72,7 @@ func (driver *OracleDriver) init(conn *Connection) error {
 	// update session parameters
 	var err error
 	for key, value := range driver.sessionParam {
-		_, err = conn.Exec(fmt.Sprintf("alter session set %s=:1", key), value)
+		_, err = conn.Exec(fmt.Sprintf("alter session set %s='%s'", key, value))
 		if err != nil {
 			return err
 		}