[Improvement][Dao] SQL optimization - limit one piece of data #5061 (#6940)

* [Feature][unittest] Recover UT in AlertPluginManagerTest.java #6619

* use throws exception instead of try-catch to catch exceptions in AlertPluginManagerTest.java

* change the assert result from assertNull to assertNotNull

* [Improvement][Dao] SQL optimization - limit one piece of data #5069

* Improve the code to A rate

Co-authored-by: linkai <linkai@bigo.sg>

dolphinscheduler-alert/dolphinscheduler-alert-server/src/test/java/org/apache/dolphinscheduler/alert/plugin/EmailAlertPluginTest.java

@@ -116,11 +116,10 @@ public class EmailAlertPluginTest {
         alertPluginInstance.setCreateTime(new Date());
         alertPluginInstance.setInstanceName("test email alert");
 
-        List<PluginDefine> pluginDefineList = pluginDao.getPluginDefineMapper().queryByNameAndType("Email", "alert");
+        PluginDefine pluginDefine = pluginDao.getPluginDefineMapper().queryByNameAndType("Email", "alert");
-        if (pluginDefineList == null || pluginDefineList.size() == 0) {
+        if (pluginDefine == null) {
             throw new RuntimeException("no alert plugin be load");
         }
-        PluginDefine pluginDefine = pluginDefineList.get(0);
         alertPluginInstance.setPluginDefineId(pluginDefine.getId());
         alertPluginInstance.setPluginInstanceParams(getEmailAlertParams());
         alertDao.getAlertPluginInstanceMapper().insert(alertPluginInstance);

dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/PluginDao.java

@@ -22,10 +22,6 @@ import static java.util.Objects.requireNonNull;
 import org.apache.dolphinscheduler.dao.entity.PluginDefine;
 import org.apache.dolphinscheduler.dao.mapper.PluginDefineMapper;
 
-import org.apache.commons.collections.CollectionUtils;
-
-import java.util.List;
-
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 
@@ -63,14 +59,13 @@ public class PluginDao {
         requireNonNull(pluginDefine.getPluginName(), "pluginName is null");
         requireNonNull(pluginDefine.getPluginType(), "pluginType is null");
 
-        List<PluginDefine> pluginDefineList = pluginDefineMapper.queryByNameAndType(pluginDefine.getPluginName(), pluginDefine.getPluginType());
+        PluginDefine currPluginDefine = pluginDefineMapper.queryByNameAndType(pluginDefine.getPluginName(), pluginDefine.getPluginType());
-        if (CollectionUtils.isEmpty(pluginDefineList)) {
+        if (currPluginDefine == null) {
             if (pluginDefineMapper.insert(pluginDefine) == 1 && pluginDefine.getId() > 0) {
                 return pluginDefine.getId();
             }
             throw new IllegalStateException("Failed to insert plugin definition");
         }
-        PluginDefine currPluginDefine = pluginDefineList.get(0);
         if (!currPluginDefine.getPluginParams().equals(pluginDefine.getPluginParams())) {
             currPluginDefine.setUpdateTime(pluginDefine.getUpdateTime());
             currPluginDefine.setPluginParams(pluginDefine.getPluginParams());

dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/mapper/PluginDefineMapper.java

@@ -64,5 +64,5 @@ public interface PluginDefineMapper extends BaseMapper<PluginDefine> {
      * @param pluginType
      * @return
      */
-    List<PluginDefine> queryByNameAndType(@Param("pluginName") String pluginName, @Param("pluginType") String pluginType);
+    PluginDefine queryByNameAndType(@Param("pluginName") String pluginName, @Param("pluginType") String pluginType);
 }

dolphinscheduler-dao/src/main/resources/org/apache/dolphinscheduler/dao/mapper/PluginDefineMapper.xml

@@ -38,6 +38,7 @@
         select *
         from t_ds_plugin_define
         where plugin_name = #{pluginName} and plugin_type = #{pluginType}
+        limit 1
     </select>
 
     <select id="queryDetailById" resultType="org.apache.dolphinscheduler.dao.entity.PluginDefine">

dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/mapper/PluginDefineTest.java

@@ -49,10 +49,10 @@ public class PluginDefineTest extends BaseDaoTest {
     @Test
     public void testQueryByNameAndType() {
         PluginDefine pluginDefine = createPluginDefine();
-        List<PluginDefine> pluginDefines = pluginDefineMapper.queryByNameAndType(pluginDefine.getPluginName(), pluginDefine.getPluginType());
+        PluginDefine pluginDefineSaved = pluginDefineMapper.queryByNameAndType(pluginDefine.getPluginName(), pluginDefine.getPluginType());
-        Assert.assertTrue(pluginDefines.size() > 0);
+        Assert.assertNotNull(pluginDefineSaved);
-        Assert.assertEquals(pluginDefines.get(0).getPluginType(), pluginDefine.getPluginType());
+        Assert.assertEquals(pluginDefineSaved.getPluginType(), pluginDefine.getPluginType());
-        Assert.assertEquals(pluginDefines.get(0).getPluginName(), pluginDefine.getPluginName());
+        Assert.assertEquals(pluginDefineSaved.getPluginName(), pluginDefine.getPluginName());
     }
 
     /**