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Today, the editor will share with you the relevant knowledge about how Java gets the value of @ TableField,@TableName annotations. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

How to get the value of @ TableField,@TableName annotation

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Don't say much, serve.

There is such a requirement that when the data is modified in the program, or when the code needs to be modified to a table, I do not want to record what has been modified through multiple log tables, so I define a table, store the table name, table fields, and then store the modified values. Although it is more troublesome to restore the data if there is a need at a later stage, it is not necessary to define so many tables if the data is processed uniformly.

Mode of operation

Define an entity class

@ TableName ("uc_cust_lock") public class CustLock {/ * logo * / @ TableId @ TableField ("cust_lock_id") private String custLockId; / * broker id * / @ TableField ("broker_user_id") private String brokerUserId / * Organization id (id of the broker) * / @ TableField ("org_id") private String orgId; / / get,set... Omit}

Get the information about the class

/ / introduced Jar package / / import com.baomidou.mybatisplus.annotation.TableField;// import com.baomidou.mybatisplus.annotation.TableId;// import com.baomidou.mybatisplus.annotation.TableName;// import java.lang.reflect.Field; private static void getProxyPojoValue (Object object, Set key1) {String id = null; / / return parameter HashMap hashMap = new HashMap (16) For (String s: key1) {Field [] fields = object.getClass () .getDeclaredFields (); for (Field field: fields) {field.setAccessible (true); / / get the table name TableName table = object.getClass () .getAnnotation (TableName.class) If (table! = null) {String tableName = table.value (); hashMap.putIfAbsent ("tableName", tableName);} / / get the primary key id if (id = = null) {boolean isIdField = field.isAnnotationPresent (TableId.class) If (isIdField) {TableField tableField = field.getAnnotation (TableField.class); if (s.toLowerCase (). Equals (field.getName (). ToLowerCase ()) {String tableId = tableField.value (); hashMap.put (smaine TableId) Id = tableId;} / / get the value of the field boolean isTableField = field.isAnnotationPresent (TableField.class); if (isTableField) {TableField tableField = field.getAnnotation (TableField.class) If (s.toLowerCase (). Equals (field.getName (). ToLowerCase ()) {String fieldValue = tableField.value (); hashMap.put (sparfieldValue);} System.out.println (hashMap);}

Main method execution

Public static void main (String [] args) throws IllegalAccessException {Set key1= new HashSet (); / / define the modified value (which can be made dynamic later) key1.add ("brokerUserId"); / / define the primary key id key1.add ("custlockid"); getProxyPojoValue (new CustLock (), key1);} / / result: / / {custlockid=cust_lock_id, brokerUserId=broker_user_id, tableName=uc_cust_lock}

Get the corresponding information through getDeclaredFields,getAnnotation, the two main key classes.

@ TableName and @ TableId are popular to join pom to rely on com.baomidou mybatis-plus-boot-starter 3.2.0 is all the content of this article "how to get the value of @ TableField,@TableName annotation by Java". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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