Questions tagged [table]

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Index - Constructor for must explicitly initialize the member which does not have a default constructor

I try to create two tables and mult_index, I received an error on output. header file #include <eosio/eosio.hpp> #include <eosio/asset.hpp> using namespace eosio; CONTRACT game : public ...
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Table values write correctly but fails to read values, possible serialize error

I'm trying to write a contract that has a table with few vectors, even tho it seems to be writing all the values correctly it fails to read the values back. The structs and tables are bellow: struct ...
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13 views

Using std::map inside multi-index

I was thinking on good practices when creating the persistence using the multi-index API, more specifically regarding future updates to the table model (ie. adding new members to the struct). All the ...
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7 views

How to derive a uint from a string to use it as key/index in eosio table

I want to store json key-value pairs in an eosio table. The keys in the json are unique and that's why it would be perfect to use them as primary_key or secondary_id for querying the table later. The ...
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14 views

What is the API to get a Merkle Proof for a transaction or a table row?

Ideally we need a Merkle Proof that a certain row is in a table. However, we may adapt our need to any form of Merkle Proof about a state or presence of a transaction. As far as I understand, the ...
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1answer
43 views

Is it allowed to look up tables of another contract?

Imagine if I have an account with contract. Is it allowed for me to look up tables of some another contract from my contract action?
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1answer
46 views

Traverse multi-index table through non-primary value and delete the record

Below is my smart contract: #include <eosio/eosio.hpp> #include <eosio/print.hpp> #include <eosio/system.hpp> #include <string> using namespace eosio; using std::string; ...
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1answer
71 views

Tables of a smart contract: public or private?

I was wondering about the ramifications of having tables declared public. Since EOSIO is a transparent blockchain anyone can read tables of any contract. So having them declared public in a smart ...
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1answer
136 views

Set lower bound and upper bound to get table rows

I am using eos-sharp to get table rows in ASP.NET. By default in the table, I want to show the latest 10 records of the table. So I get them using: GetTableRowsResponse tabledata = await eos....
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1answer
43 views

Using a smart contract table. How can I query a row using another field instead of the primary key id?

How can I query a smart contract table to return a row instead of using the primary key id? I have the following: https://jungle.bloks.io/account/mybest111111?loadContract=true&tab=Tables&...
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1answer
72 views

How to access data inside multi-index table when using 2D vector / 2D array?

What is going on? :D I write data, but cannot find it after I write it. The following code successfully emplaces the row into the multi-index table: See specifically the vector<vector <...
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1answer
102 views

how to get tables rows count in plugin

auto chain_plug = app().find_plugin<chain_plugin>(); eosio::chain_apis::read_only::get_table_by_scope_params param{N("eosio.token"), N("stat"), "EOS", "EOS&...
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1answer
33 views

Altering userres and delband tables after set_resource_limit(-1, -1, -1)

For a private network to remove ram net cpu i set the resource limit to unlimited for each newaccount created. By chaging set_resource_limits to set_resource_limits( newact, -1, -1, -1 ); //unlimited ...
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1answer
36 views

Wrong table name in scope response

My contract has two tables mcat and mcatmig. Problem: scope request return wrong table name mcat........1 instead of mcatmig: % cleos get scope teresacode { "rows": [{ "code": "teresacode", "...
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1answer
83 views

cleos data getting inserted and deleted but table shows empty record

I have written one smart contract for insert, update and delete data. The smart contract is compiled and deployed to the two accounts. I insert data using calling the action upsert, this transaction ...
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1answer
62 views

Is it possible to add a secondary index to a table that already exists and contains entries?

If a table already exists in a smart contract on-chain and the table is full of entries, is it possible to make a secondary index for that table? Or would you have to create a new table and migrate ...
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28 views

unordered map in eosio-cpp

I want to have an unordered_map inside a table so that I can have O(1) entry and retrieval. Can someone please link me to a snippet which implements that? I am new to cpp.
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1answer
67 views

Is there way to retrieve auto incremented primary key after submission of transaction?

I'm working on sample dApp application to understand the working of multi_index table in EOS smart contract. I have defined two multi_index table. The primary key of table1 is auto incremented using "...
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1answer
401 views

How can we retrieve table data with secondary Index in EOS table

this is my table struct [[eosio::table]] payment_made { uint64_t pay_id; uint64_t loan_id; uint64_t pay_amunt; time_point_sec pay_date_req; time_point_sec pay_date_approve; ...
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1answer
51 views

Multi index table asks an unusual permission to emplace new row

Problem I'm trying to emplace a new row in a multi-index table, but it tells me that I don't have the authotity of the row key name to do it. Code Multi-index table definition struct [[eosio::...
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1answer
283 views

Can we store date on eosio table?

Is there any direct datatype in eosio to store date? and if not then how can we store dates in eosio table? void mainloan::paymentConfirm(uint64_t pay_id,uint64_t pay_date,double pay_amunt,name from ...
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42 views

Which of the following is better for CRUD in a table?

I have two approaches to save data on blockchain, but I don't know which one is the best from time as well as space complexity perspectives. I want to store key value pairs in a table. First Approach:...
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1answer
35 views

what are supported STL types in tables?

What are the supported STL types in tables? I'm specifically curious about std::pair
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0answers
38 views

Fetching More Table Rows via RPC

I have a contract with a table in it. I'm querying the contents of the table using the RPC interface, but I'm having trouble getting all the rows. To limit the memory usage of my application, I'm ...
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1answer
88 views

How to delete record on EOS if I forget table structure

I issue an EOS token for fun half a year ago and I'm planning to release my EOS ram recently. The problem is that I forget the table structure I made before and I overwrite the contract and there is ...
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1answer
99 views

How to reclaim ram?

If a user is the authenticator when adding a row to a table, on chain, they supply the ram required to instantiate the new row. In the case of certain tokens, mainly airdropped tokens, the contract ...
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2answers
642 views

Get Table Rows with Pagination

How do we get records from a table by pages? My requirement: I have a table with 100 records and want to display all these records in my front-end-application with 10 records per page and if the user ...
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1answer
43 views

why i get "uniqueness constraint was violated" on error on empty table?

i defined a table but i made a mistake putting the fields in wrong order within EOSLIB_SERIALIZE EOSLIB_SERIALIZE( tablename,(field1)(field4)(field3)(field2)); i did some insertions with emplace ...
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1answer
314 views

Why does using available_primary_key() as scope for a table result in this behaviour?

Scenario: Two tables, each using uint64_t as a primary key Table A rows need to reference rows in Table B Why? Relational database data duplication reasoning etc etc Both table's primary keys are ...
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3answers
232 views

Smart contract - find on two columns

I am currently writing a blog PoC on EOS. I would like the ability to delete a post. Now deleting by the ID alone is simple, I have it implemented as follows: whisper::post_index posts(_code, _code....
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2answers
280 views

Erasing records with for loops

if I want to erase a table: orderbook b(_self, _self.value); auto m = b.get_index<name("idxprod")>(); for (auto &i : m) { m.erase(i); } I get the error: Error 3160005: The table ...
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1answer
285 views

How to sort a table?

I'm following this explanation https://developers.eos.io/eosio-cpp/v1.1.0/docs/multi-index-table-tutorial using v1.5.0 of the CDT. Here's what I've got: struct [[eosio::table]] order_struct { ...
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1answer
50 views

What is the most reliable way to sync contact account tables?

I have a contract account which has some tables. I want to watch for onchain table changes and sync them to an offline database as soon as possible. What is the most reliable way to do this? I have ...
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2answers
49 views

Is there a way to check the histroy of a contract's table?

Is there a way to check the history after deleting the information in the table? For example, check yesterday's table information.
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1answer
283 views

Indexing a table by asset symbol -- how to find?

suppose I declare: struct [[eosio::table]] tst { asset component; uint64_t primary_key() const { return component.symbol.code().raw(); } }; where I mean to keep a list of assets. ...
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0answers
24 views

tables of eosio.token are not generated in abi file

I am using "server_version_string": "v1.2.3". And I am trying to compile and customize the eosio.token contract, but the tables are accounts and currency_stats table are not generated in abi file. How ...
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1answer
228 views

Can we typecast string to use it as a id in table?

I need to use a string as a id of table in my smart contract. Initially i found some answers that string can't be use as primary key. But i use string as a key in table as given below: //@abi table ...
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1answer
98 views

Multiple Inheritance within ABI files

I have various classes that use multiple inheritance, i.e.: class A { }; class B { }; class C : public A, public B { }; Single inheritance in an ABI file is possible using the base layer as ...
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1answer
1k views

scope in the get table command

What is the meaning of scope argument in the get table command? For example, in the todo_contract, (https://developers.eos.io/eosio-cleos/reference#cleos-get-table) we have cleos --wallet-url http:...
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1answer
185 views

Is it possible to have a secondary index as unique?

As per title, I'm using a key256 as a datatype for a secondary index on a multi-index table and want it to be unique. Can't find any documentation on it. TIA.
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1answer
205 views

How can I create a table in an .hpp for a general contract? (Using the CDT)

THE STRUCTURE OF MY PROJECT I am working in mycontract.cpp, which imports myheader.hpp WHAT I WANT I want to create a table in myheader.hpp, for a generic contract, "IN THEORY" as follows: struct [...
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3answers
1k views

How to properly use cleos get table with --key-type sha256 / secondary index (failing on 1.4.2)

I am not able to filter a hash correctly, using get table / get_table_rows. Also I noticed that the abi is not generating a secondary index, although I am assuming this is not the problem, since ...
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1answer
55 views

Are table lookups, like get_table_rows, included in CPU/NET resource calculation?

If a smart contract includes user data, would our smart contract be charged CPU/NET resources to do lookups on those tables, or is it only charged for transfers and actions etc.
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1answer
105 views

BUG when two accounts send action at the same time to modify multiindex table

It took me several days to find the bug. I got a table like this TABLE t {uint64_t key, name player1, name player2, uint64_t status}; When the contract received the specific action, it will go ...
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2answers
440 views

Is it possible to use a type other than uint64_t for a table primary key?

I want to use a uint128_t as a primary key in a multi_index table. Is this possible? If so, how should the ABI file be written to accomodate it?
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1answer
396 views

Trying to pass a sha256 hash to my contract and store it

I'm new to the EOS platform. For my use case I'm trying to pass a sha256 hash to a function in my contract and store it in a table which is indexed by that hash. I've realized you can't have the ...
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1answer
181 views

Contract Table Query Exception

As i was following eosio developers documentation #include <eosiolib/eosio.hpp> #include <eosiolib/print.hpp> using namespace eosio; using namespace std; class addressbook : public ...
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1answer
799 views

Assertion failure after updating a smart contract with tables

Before the update Before the update of the code of my c++ smart contract, this uses to work absolutely fine. Data storing on the table and actions execution were done successfully. After the update ...
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1answer
72 views

Same name table of different contracts got merged

I wrote a contract, suppose C defining the multi-index table T. Table struct has two parameter suppose x and y. x was the primary key. I made some entries in T and when i tried to access it back, I ...
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1answer
48 views

Can we store documents in a table.If yes, Is this a right approach?

I want to store some documents in my smart contract that some users upload. Can I use table for storage? But second thing is table resides in RAM and this doesn't seems good to store data in Ram. Is ...