1.数据库追踪点加上数据库连接的close操作，用于调试可能的连接泄露

skywalking-sdk-plugin/jdbc-plugin/pom.xml

@@ -23,12 +23,6 @@
             <artifactId>skywalking-api</artifactId>
             <version>${project.version}</version>
         </dependency>
-        <dependency>
-            <groupId>com.ai.cloud</groupId>
-            <artifactId>skywalking-auth</artifactId>
-            <version>${project.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>

skywalking-sdk-plugin/jdbc-plugin/src/main/java/com/ai/cloud/skywalking/plugin/jdbc/SWConnection.java

@@ -97,7 +97,14 @@ public class SWConnection implements java.sql.Connection {
 	}
 
 	public void close() throws SQLException {
-		realConnection.close();
+		ConnectionTracing.execute(realConnection, connectInfo, "close", "",
+				new Executable<String>() {
+					public String exe(java.sql.Connection realConnection,
+							String sql) throws SQLException {
+						realConnection.close();
+						return null;
+					}
+				});
 	}
 
 	public boolean isClosed() throws SQLException {