Update SqlFunc.CharIndex pgsql

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";

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];

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";