【8.0.1】【db】更新一个获取最大数的方法

kernel-d-db/db-api/src/main/java/cn/stylefeng/roses/kernel/db/api/DbOperatorApi.java

@@ -74,4 +74,12 @@ public interface DbOperatorApi {
      */
     Set<Long> findSubListByParentId(String tableName, String parentIdsFieldName, String keyFieldName, Long keyFieldValue);
 
+    /**
+     * 获取数据库，指定表，指定字段在库里的最大值
+     *
+     * @author fengshuonan
+     * @since 2023/10/29 16:07
+     */
+    Long getMaxSortByTableName(String tableName, String fieldName);
+
 }

kernel-d-db/db-sdk-mp/src/main/java/cn/stylefeng/roses/kernel/db/mp/dboperator/DbOperatorImpl.java

@@ -35,6 +35,7 @@ import org.springframework.stereotype.Service;
 
 import javax.annotation.Resource;
 import java.util.List;
+import java.util.Map;
 import java.util.Set;
 import java.util.stream.Collectors;
 
@@ -75,4 +76,18 @@ public class DbOperatorImpl implements DbOperatorApi {
         return subIds.stream().map(i -> Long.valueOf(i.toString())).collect(Collectors.toSet());
     }
 
+    @Override
+    public Long getMaxSortByTableName(String tableName, String fieldName) {
+
+        String tempFieldName = "maxSort";
+
+        String sqlTemplate = "select max({}) as {} from {}";
+        String sql = StrUtil.format(sqlTemplate, fieldName, tempFieldName, tableName);
+
+        Map<String, Object> oneResult = SqlRunner.db().selectOne(sql);
+        Object maxSort = oneResult.get(tempFieldName);
+
+        return Convert.toLong(maxSort);
+    }
+
 }