diff --git a/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
index a2a0df214f68e4932991bf80e2a6b54a5458a21e..7e2eb995cc837f463da513766afa7279b714cbf7 100644
--- a/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.TDSQLForPGODBC/TDSQLForPG/SqlBuilder/TDSQLForPGODBCExpressionContext.cs
@@ -130,6 +130,8 @@ namespace SqlSugar.TDSQLForPGODBC
                 });
             }
         }
+
+        public override string GetLimit() { return "limit 1"; }
     }
     public class TDSQLForPGODBCMethod : DefaultDbMethod, IDbMethods
     {
diff --git a/Src/Asp.NetCore2/SqlSugar/Abstract/DbBindProvider/IDataRecordExtensions.cs b/Src/Asp.NetCore2/SqlSugar/Abstract/DbBindProvider/IDataRecordExtensions.cs
index 959758c3c0637b70280c93ce6af0682bd9f4c699..47eea50fce96a92ba19389218a5027a07f8f0f16 100644
--- a/Src/Asp.NetCore2/SqlSugar/Abstract/DbBindProvider/IDataRecordExtensions.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Abstract/DbBindProvider/IDataRecordExtensions.cs
@@ -151,7 +151,7 @@ namespace SqlSugar
             }
             if (dr.GetDataTypeName(i) == "NUMBER") 
             {
-               return Convert.ToInt32(dr.GetDouble(i));
+               return Convert.ToInt32(dr.GetValue(i));
             }
             var result = dr.GetInt32(i);
             return result;
@@ -160,7 +160,7 @@ namespace SqlSugar
         { 
             if (dr.GetDataTypeName(i) == "NUMBER")
             {
-                return Convert.ToInt32(dr.GetDouble(i));
+                return Convert.ToInt32(dr.GetValue(i));
             } 
             var result = dr.GetInt32(i);
             return result;
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
index 2fe4755a85b4e531a0cce995f19a471c3eaadf5c..12a7b53163f3ba8122c7a87ee5eec47fdbee0d79 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTake.cs
@@ -72,7 +72,7 @@ namespace SqlSugar
             {
                 return "TOP " + num;
             }
-            else if (this.Context is OracleExpressionContext)
+            else if (this.Context is OracleExpressionContext || this.Context.SugarContext.Context.CurrentConnectionConfig.DbType == DbType.OceanBaseForOracle)
             {
                 return (HasWhere ? "AND" : "WHERE") + " ROWNUM<=" + num;
             }
diff --git a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
index e0d810a38e9effa7b8b96155e9412ef810e1ece2..adcc3ef774aaf9bac48dda354e4f15ade5c60811 100644
--- a/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
+++ b/Src/Asp.NetCore2/SqlSugar/ExpressionsToSql/Subquery/Items/SubTop.cs
@@ -57,7 +57,7 @@ namespace SqlSugar
             {
                 return "TOP 1";
             }
-            else if (this.Context is OracleExpressionContext)
+            else if (this.Context is OracleExpressionContext || this.Context.SugarContext.Context.CurrentConnectionConfig.DbType == DbType.OceanBaseForOracle)
             {
                 return (HasWhere?"AND":"WHERE")+ " ROWNUM=1";
             }