Commons-dbUtils开发应用和研究（四）
private boolean isCompatibleType(Object value, Class type) {
// Do object check first, then primitives
if (value == null || type.isInstance(value)) {
return true;
} else if (
type.equals(Integer.TYPE) && Integer.class.isInstance(value)) {
return true;
} else if (type.equals(Long.TYPE) && Long.class.isInstance(value)) {
return true;
} else if (
type.equals(Double.TYPE) && Double.class.isInstance(value)) {
return true;
} else if (type.equals(Float.TYPE) && Float.class.isInstance(value)) {
return true;
} else if (type.equals(Short.TYPE) && Short.class.isInstance(value)) {
return true;
} else if (type.equals(Byte.TYPE) && Byte.class.isInstance(value)) {
return true;
} else if (
type.equals(Character.TYPE) && Character.class.isInstance(value)) {
return true;
} else if (
type.equals(Boolean.TYPE) && Boolean.class.isInstance(value)) {
return true;
} else {
return false;
}
}
/**
*创建一个对象
*/
protected Object newInstance(Class c) throws SQLException {
try {
return c.newInstance();
} catch (InstantiationException e) {
throw new SQLException(
"Cannot create " + c.getName() + ": " + e.getMessage());
} catch (IllegalAccessException e) {
throw new SQLException(
"Cannot create " + c.getName() + ": " + e.getMessage());
}
}
/**
* 返回一个类的属性描述的信息
*/
private PropertyDescriptor[] propertyDescriptors(Class c)
throws SQLException {
// Introspector caches BeanInfo classes for better performance
BeanInfo beanInfo = null;
try {
beanInfo = Introspector.getBeanInfo(c);
} catch (IntrospectionException e) {
throw new SQLException(
"Bean introspection failed: " + e.getMessage());
}
return beanInfo.getPropertyDescriptors();
}