refactor: 去掉废弃代码

backend/src/main/java/io/dataease/datasource/provider/ProviderFactory.java

@@ -62,16 +62,10 @@ public class ProviderFactory implements ApplicationContextAware {
     public static DDLProvider getDDLProvider(String type) {
         DatasourceTypes datasourceType = DatasourceTypes.valueOf(type);
         switch (datasourceType) {
-            case mysql:
-                return context.getBean("mysqlDDL", DDLProvider.class);
             case doris:
                 return context.getBean("dorisDDL", DDLProvider.class);
-            case oracle:
-                return context.getBean("oracleDDL", DDLProvider.class);
-            case sqlServer:
-                return context.getBean("mysqlDDL", DDLProvider.class);
             default:
-                return context.getBean("mysqlDDL", DDLProvider.class);
+                return context.getBean("dorisDDL", DDLProvider.class);
         }
     }
 

backend/src/main/java/io/dataease/provider/mysql/MysqlDDLProvider.java

-package io.dataease.provider.mysql;
-
-import io.dataease.provider.DDLProvider;
-import org.springframework.stereotype.Service;
-
-/**
- * @Author gin
- * @Date 2021/5/17 4:27 下午
- */
-@Service("mysqlDDL")
-public class MysqlDDLProvider extends DDLProvider {
-    @Override
-    public String createView(String name, String viewSQL) {
-        return "CREATE VIEW IF NOT EXISTS " + name + " AS (" + viewSQL + ")";
-    }
-
-    @Override
-    public String dropTable(String name) {
-        return "DROP TABLE IF EXISTS " + name;
-    }
-
-    @Override
-    public String dropView(String name) {
-        return "DROP VIEW IF EXISTS " + name;
-    }
-}

backend/src/main/java/io/dataease/provider/oracle/OracleDDLProvider.java

-package io.dataease.provider.oracle;
-
-import io.dataease.provider.DDLProvider;
-import org.springframework.stereotype.Service;
-
-/**
- * @Author gin
- * @Date 2021/5/17 4:27 下午
- */
-@Service("oracleDDL")
-public class OracleDDLProvider extends DDLProvider {
-    @Override
-    public String createView(String name, String viewSQL) {
-        return "CREATE VIEW IF NOT EXISTS " + name + " AS (" + viewSQL + ")";
-    }
-
-    @Override
-    public String dropTable(String name) {
-        return "DROP TABLE IF EXISTS " + name;
-    }
-
-    @Override
-    public String dropView(String name) {
-        return "DROP VIEW IF EXISTS " + name;
-    }
-}