Mybatis can set value with reflection? - mybatis

Question

Mybatis can set value with reflection?
I have a class , and it has a property , it's setter is protected . So I have to use reflection to set this value ? Mybatis can work ?

Answer 1

yes, mybatis use reflect to set value.
in Reflator.java(mybatis 3.3.0), mybatis will config set method.
private void addSetMethods(Class<?> cls) {
Map<String, List<Method>> conflictingSetters = new HashMap<String, List<Method>>();
Method[] methods = getClassMethods(cls);
for (Method method : methods) {
String name = method.getName();
if (name.startsWith("set") && name.length() > 3) {
if (method.getParameterTypes().length == 1) {
name = PropertyNamer.methodToProperty(name);
addMethodConflict(conflictingSetters, name, method);
}
}
}
resolveSetterConflicts(conflictingSetters);
}
if your class do not have set method, when addSetFields it will add new SetInvoker for the field:
private void addSetField(Field field) {
if (isValidPropertyName(field.getName())) {
setMethods.put(field.getName(), new SetFieldInvoker(field));
setTypes.put(field.getName(), field.getType());
}
}
and the SetFieldInvoker is like this:
/**
* #author Clinton Begin
*/
public class SetFieldInvoker implements Invoker {
private Field field;
public SetFieldInvoker(Field field) {
this.field = field;
}
#Override
public Object invoke(Object target, Object[] args) throws IllegalAccessException, InvocationTargetException {
field.set(target, args[0]);
return null;
}
#Override
public Class<?> getType() {
return field.getType();
}
}
the DefaultResultSetHandler calls BeanWrapper's setBeanProperty method will call getSetInvoker
private void setBeanProperty(PropertyTokenizer prop, Object object, Object value) {
try {
Invoker method = metaClass.getSetInvoker(prop.getName());
Object[] params = {value};
try {
method.invoke(object, params);
} catch (Throwable t) {
throw ExceptionUtil.unwrapThrowable(t);
}
} catch (Throwable t) {
throw new ReflectionException("Could not set property '" + prop.getName() + "' of '" + object.getClass() + "' with value '" + value + "' Cause: " + t.toString(), t);
}
}
the whole call chain maybe like this:
DefaultSqlSession##selectList -->SimpleExecutor##doQuery --> SimpleStatementHandler##query --> DefaultResultSetHandler##handleResultSets