bug fixed for StatFilter runningCount incorrect when sql execute error

src/main/java/com/alibaba/druid/filter/stat/StatFilter.java

@@ -492,6 +492,7 @@ public class StatFilter extends FilterEventAdapter implements StatFilterMBean {
         JdbcSqlStat sqlStat = statement.getSqlStat();
 
         if (sqlStat != null) {
+            sqlStat.decrementExecutingCount();
             sqlStat.error(error);
             sqlStat.addExecuteTime(statement.getLastExecuteType(), statement.isFirstResultSet(), nanos);
             statement.setLastExecuteTimeNano(nanos);

src/test/java/com/alibaba/druid/bvt/filter/StatFilterExecErrorTest.java

@@ -0,0 +1,77 @@
+package com.alibaba.druid.bvt.filter;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.filter.FilterAdapter;
+import com.alibaba.druid.filter.FilterChain;
+import com.alibaba.druid.pool.DruidDataSource;
+import com.alibaba.druid.proxy.jdbc.PreparedStatementProxy;
+import com.alibaba.druid.proxy.jdbc.ResultSetProxy;
+import com.alibaba.druid.proxy.jdbc.StatementProxy;
+import com.alibaba.druid.stat.JdbcSqlStat;
+import com.alibaba.druid.util.JdbcUtils;
+
+public class StatFilterExecErrorTest extends TestCase {
+
+    private DruidDataSource dataSource;
+
+    protected void setUp() throws Exception {
+        dataSource = new DruidDataSource();
+
+        dataSource.setUrl("jdbc:mock:xxx");
+        dataSource.setFilters("stat");
+        dataSource.setTestOnBorrow(false);
+        dataSource.getProxyFilters().add(new FilterAdapter() {
+
+            @Override
+            public ResultSetProxy statement_executeQuery(FilterChain chain, StatementProxy statement, String sql)
+                                                                                                                 throws SQLException {
+                throw new SQLException();
+            }
+
+            @Override
+            public ResultSetProxy preparedStatement_executeQuery(FilterChain chain, PreparedStatementProxy statement)
+                                                                                                                     throws SQLException {
+                throw new SQLException();
+            }
+        });
+
+        dataSource.init();
+    }
+
+    protected void tearDown() throws Exception {
+        JdbcUtils.close(dataSource);
+    }
+
+    public void test_stat() throws Exception {
+        Connection conn = dataSource.getConnection();
+
+        String sql = "select 'x'";
+        PreparedStatement stmt = conn.prepareStatement("select 'x'");
+
+        JdbcSqlStat sqlStat = dataSource.getDataSourceStat().getSqlStat(sql);
+
+        Assert.assertEquals(0, sqlStat.getReadStringLength());
+
+        try {
+            stmt.executeQuery();
+        } catch (SQLException eror) {
+
+        } finally {
+            JdbcUtils.close(stmt);
+            JdbcUtils.close(conn);
+        }
+
+        Assert.assertEquals(1, sqlStat.getErrorCount());
+        Assert.assertEquals(0, sqlStat.getRunningCount());
+
+        sqlStat.reset();
+    }
+
+}