Pull request #6187: REPORT-74418 informix等老驱动未实现部分Connection接口导致druid创建线程退出

Merge in CORE/base-third from ~RINOUX/base-third:release/11.0 to release/11.0

* commit '0780ba32133b868b4e4f45f5462b7a4dd71e23d5':
  REPORT-74418 informix等老驱动未实现部分Connection接口导致druid创建线程退出

fine-druid/src/main/java/com/fr/third/alibaba/druid/pool/DruidConnectionHolder.java

@@ -27,12 +27,14 @@ import javax.sql.ConnectionEventListener;
 import javax.sql.StatementEventListener;
 import java.sql.Connection;
 import java.sql.SQLException;
-import java.sql.SQLFeatureNotSupportedException;
 import java.sql.Statement;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Date;
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.CopyOnWriteArrayList;
 import java.util.concurrent.locks.ReentrantLock;
 
@@ -41,6 +43,8 @@ import java.util.concurrent.locks.ReentrantLock;
  */
 public final class DruidConnectionHolder {
     private final static Log LOG = LogFactory.getLog(DruidConnectionHolder.class);
+
+    static Set<DbType> holdabilityUnsupportedDbTypes = new HashSet<>(Arrays.asList(DbType.sybase, DbType.db2, DbType.hive, DbType.odps));
     public static boolean holdabilityUnsupported = false;
 
     protected final DruidAbstractDataSource dataSource;
@@ -101,53 +105,46 @@ public final class DruidConnectionHolder {
         this.lastActiveTimeMillis = connectTimeMillis;
         this.lastExecTimeMillis = connectTimeMillis;
 
-        this.underlyingAutoCommit = conn.getAutoCommit();
-
         if (conn instanceof WrapperProxy) {
             this.connectionId = ((WrapperProxy) conn).getId();
         } else {
             this.connectionId = dataSource.createConnectionId();
         }
 
-        {
-            boolean initUnderlyHoldability = !holdabilityUnsupported;
+
+        // 下面是一些驱动的默认值，reset时用到
+
+        // autoCommit
+        this.underlyingAutoCommit = conn.getAutoCommit();
+
+        // holdability
         DbType dbType = DbType.of(dataSource.dbTypeName);
-            if (dbType == DbType.sybase //
-                    || dbType == DbType.db2 //
-                    || dbType == DbType.hive //
-                    || dbType == DbType.odps //
-            ) {
-                initUnderlyHoldability = false;
-            }
-            if (initUnderlyHoldability) {
+        boolean initUnderlyingHoldability = !holdabilityUnsupported;
+        if (holdabilityUnsupportedDbTypes.contains(dbType)) {
+            initUnderlyingHoldability = false;
+        }
+
+        if (initUnderlyingHoldability) {
             try {
                 this.underlyingHoldability = conn.getHoldability();
-                } catch (UnsupportedOperationException | AbstractMethodError | SQLFeatureNotSupportedException e) {
-                    holdabilityUnsupported = true;
-                    LOG.warn("getHoldability unsupported", e);
-                } catch (SQLException e) {
-                    // bug fixed for hive jdbc-driver
-                    if ("Method not supported".equals(e.getMessage())) {
-                        holdabilityUnsupported = true;
-                    }
-                    LOG.warn("getHoldability error", e);
             } catch (Throwable e) {
+                holdabilityUnsupported = true;
                 LOG.warn("getHoldability error", e);
             }
         }
-        }
 
+        // readOnly
+        try {
             this.underlyingReadOnly = conn.isReadOnly();
+        } catch (Throwable e) {
+            LOG.warn("isReadOnly error", e);
+        }
+
+        // transactionIsolation
         try {
             this.underlyingTransactionIsolation = conn.getTransactionIsolation();
-        } catch (SQLException e) {
-            // compartible for alibaba corba
-            if ("HY000".equals(e.getSQLState())
-                    || "com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException".equals(e.getClass().getName())) {
-                // skip
-            } else {
-                throw e;
-            }
+        } catch (Throwable e) {
+            LOG.warn("getTransactionIsolation error", e);
         }
 
         this.defaultHoldability = underlyingHoldability;