diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
index be10df526..298bc20c1 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Kdbndp/SqlBuilder/KdbndpExpressionContext.cs
@@ -104,6 +104,10 @@ namespace SqlSugar
     }
     public class KdbndpMethod : DefaultDbMethod, IDbMethods
     {
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format(" (strpos ({1},{0})-1)", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
         public override string TrueValue()
         {
             return "true";
diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Oscar/SqlBuilder/OscarExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Oscar/SqlBuilder/OscarExpressionContext.cs
index 445494e5e..d4514c5e6 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Oscar/SqlBuilder/OscarExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Oscar/SqlBuilder/OscarExpressionContext.cs
@@ -98,6 +98,10 @@ namespace SqlSugar
     }
     public class OscarLMethod : DefaultDbMethod, IDbMethods
     {
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format(" (strpos ({1},{0})-1)", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
         public override string IIF(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];
diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
index b74148165..c724835c1 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/PostgreSQL/SqlBuilder/PostgreSQLExpressionContext.cs
@@ -133,6 +133,10 @@ namespace SqlSugar
     }
     public class PostgreSQLMethod : DefaultDbMethod, IDbMethods
     {
+        public override string CharIndex(MethodCallExpressionModel model)
+        {
+            return string.Format(" (strpos ({1},{0})-1)", model.Args[0].MemberName, model.Args[1].MemberName);
+        }
         public override string TrueValue()
         {
             return "true";