Update readme

README.md

@@ -136,7 +136,8 @@ void main() throws Exception {
                 """)) {
             var rs = stmt.executeQuery();
 
-            // Methods exist for all 8 primitives
+            // Methods exist for all primitives except char 
+            // (which doesn't have a method on ResultSet)
             var number = ResultSets.getIntegerNullable(rs, "number");
         }
     }
@@ -165,7 +166,8 @@ void main() throws Exception {
                 """)) {
             var rs = stmt.executeQuery();
 
-            // Methods exist for all 8 primitives
+            // Methods exist for all primitives except char 
+            // (which doesn't have a method on ResultSet)
             var number = ResultSets.getIntegerNotNull(rs, "number");
         }
     }

src/main/java/dev/mccue/jdbc/ResultSets.java

@@ -436,7 +436,7 @@ public static Float getFloatNullable(ResultSet rs, String columnName) throws SQL
     public static double getDoubleNotNull(ResultSet rs, int index) throws SQLException {
         var value = rs.getDouble(index);
         if (rs.wasNull()) {
-            throw new SQLException("Column " + index + " was null");
+            throw new SQLException(STR."Column \{index} was null");
         }
         return value;
     }
@@ -453,7 +453,7 @@ public static double getDoubleNotNull(ResultSet rs, int index) throws SQLExcepti
     public static double getDoubleNotNull(ResultSet rs, String columnName) throws SQLException {
         var value = rs.getDouble(columnName);
         if (rs.wasNull()) {
-            throw new SQLException("Column " + columnName + " was null");
+            throw new SQLException(STR."Column \{columnName} was null");
         }
         return value;
     }