[fix] In the higher version of mysql-connector-java 8x, there is an error in the value of db.instance. (#427)

Author: lvxiao1

CHANGES.md

@@ -19,6 +19,7 @@ Release Notes.
 * Add [Micrometer Observation](https://github.com/micrometer-metrics/micrometer/) support
 * Add tags `mq.message.keys` and `mq.message.tags` for RocketMQ producer span
 * Clean the trace context which injected into Pulsar MessageImpl after the instance recycled
+* Fix In the higher version of mysql-connector-java 8x, there is an error in the value of db.instance.
 
 #### Documentation
 

apm-sniffer/apm-sdk-plugin/mysql-8.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/jdbc/mysql/v8/define/ConnectionInstrumentation.java

@@ -115,6 +115,22 @@ public String getMethodsInterceptor() {
                     return org.apache.skywalking.apm.plugin.jdbc.mysql.Constants.SET_CATALOG_INTERCEPTOR;
                 }
 
+                @Override
+                public boolean isOverrideArgs() {
+                    return false;
+                }
+            },
+            new InstanceMethodsInterceptPoint() {
+                @Override
+                public ElementMatcher<MethodDescription> getMethodsMatcher() {
+                    return named("setDatabase");
+                }
+
+                @Override
+                public String getMethodsInterceptor() {
+                    return org.apache.skywalking.apm.plugin.jdbc.mysql.Constants.SET_CATALOG_INTERCEPTOR;
+                }
+
                 @Override
                 public boolean isOverrideArgs() {
                     return false;