Raise ArgumentError when database and url are both missing

Prevents building a malformed JDBC URL like jdbc:oracle:thin:@//host:port/
when :database is nil and no :url is provided.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: yahonda

lib/plsql/jdbc_connection.rb

@@ -59,6 +59,8 @@ def self.jdbc_connection_url(params)
       else
         return params[:url] if params[:url]
 
+        raise ArgumentError, "database or url option is required" if database.nil? || database.empty?
+
         host = params[:host] || "localhost"
         port = params[:port] || 1521
 

spec/plsql/connection_spec.rb

@@ -526,6 +526,12 @@
       end
     end
 
+    it "should raise ArgumentError when database and url are not provided" do
+      expect {
+        PLSQL::JDBCConnection.jdbc_connection_url(host: "myhost")
+      }.to raise_error(ArgumentError, /database or url option is required/)
+    end
+
     it "should use custom URL when provided" do
       custom_url = "jdbc:oracle:thin:@//custom:1522/MYSERVICENAME"
       url = PLSQL::JDBCConnection.jdbc_connection_url(host: "myhost", database: "MYSERVICENAME", url: custom_url)