得到的

C00-common/pps-common/src/main/java/pps/core/common/constant/BusinessConstant.java

@@ -60,6 +60,11 @@ public class BusinessConstant {
      */
     public static final String LAST_LIMIT = "LIMIT 1";
 
+    /**
+     * 默认取单个
+     */
+    public static final String LAST_LIMIT_ORACLE = "AND ROWNUM = 1";
+
     /**
      * 开井
      */

C00-common/pps-common/src/main/java/pps/core/common/utils/BaseUtils.java

@@ -9,6 +9,7 @@ import cn.hutool.core.util.IdUtil;
 import pps.core.common.constant.BusinessConstant;
 import pps.core.common.entity.BaseModel;
 import pps.core.common.session.PpsUserSession;
+import xstartup.base.XStartup;
 
 import java.math.BigDecimal;
 import java.math.RoundingMode;
@@ -25,6 +26,22 @@ import java.util.stream.Stream;
  */
 public class BaseUtils {
 
+    private static final String databaseId = XStartup.getCurrent().getProperty("x.db.databaseId");
+
+    /**
+     * 获取唯一一条
+     *
+     * @return {@link String }
+     */
+    public static String getLastLimit() {
+        switch (databaseId) {
+            case "Oracle":
+                return BusinessConstant.LAST_LIMIT_ORACLE;
+            default:
+                return BusinessConstant.LAST_LIMIT;
+        }
+    }
+
     /**
      * 按每500个一组分割
      */