Patrick0308 commented on a change in pull request #5109:
URL: https://github.com/apache/skywalking/pull/5109#discussion_r456179614
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File path:
apm-sniffer/apm-sdk-plugin/mysql-common/src/main/java/org/apache/skywalking/apm/plugin/jdbc/mysql/PreparedStatementExecuteMethodsInterceptor.java
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@@ -40,15 +40,14 @@
public final void beforeMethod(EnhancedInstance objInst, Method method,
Object[] allArguments,
Class<?>[] argumentsTypes,
MethodInterceptResult result) {
StatementEnhanceInfos cacheObject = (StatementEnhanceInfos)
objInst.getSkyWalkingDynamicField();
- ConnectionInfo connectInfo = cacheObject.getConnectionInfo();
/**
* For avoid NPE. In this particular case, Execute sql inside the
{@link com.mysql.jdbc.ConnectionImpl} constructor,
* before the interceptor sets the connectionInfo.
- *
+ * Fixed https://github.com/apache/skywalking/issues/4965. When
invoking prepareCall, cacheObject is null. Because it will determine
procedures's parameter types by querying the table of proc in mysql.
Review comment:
When invoking prepareCall, it will determine procedures's parameter
types by execute sql.` StatementEnhanceInfos` is set after prepareCall, so
`cacheObject is` null in
`PreparedStatementExecuteMethodsInterceptor.beforeMethod`.
If we don't need to record the sql which determine procedures's parameter
types when invoking prepareCall, we can skip it.
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