@Target(value = { ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
public @interface SetTable {
String value();
}
@Retention(RetentionPolicy.RUNTIME)
public @interface SetProperty {
String name();
int leng();
}
@Table(value = "it_user")
class User {
@ProPerty(value = "it_id", leng = 10)
private String id;
@ProPerty(value = "it_name", leng = 10)
private String name;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
@Target(value = ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@interface Table {
String value();
}
@Retention(RetentionPolicy.RUNTIME)
@interface ProPerty {
String value();
int leng();
}
public class Test002 {
public static void main(String[] args) throws ClassNotFoundException {
ClassforName= Class.forName("com.itmayiedu.User");
StringBuffersf = new StringBuffer();
sf.append(" select ");
// 获取当前的所有的属性
Field[]declaredFields = forName.getDeclaredFields();
for (int i = 0; i < declaredFields.length; i++) {
Fieldfield = declaredFields[i];
ProPerty proPertyAnnota = field.getDeclaredAnnotation(ProPerty.class);
StringproPertyName = proPertyAnnota.value();
sf.append("
" + proPertyName);
if (i < declaredFields.length - 1) {
sf.append(" ,
");
}
}
Table tableAnnota = forName.getDeclaredAnnotation(Table.class);
// 表的名称
StringtableName = tableAnnota.value();
sf.append(" from " + tableName);
System.out.println(sf.toString());
}
}
