Ethereum: Object value modified by function
Modification of user data with sorting sensitive to solidity
When you build a user database, it is essential to ensure data integrity and consistency in different cases (capital letters, tiny and mixed). One way to achieve this is to modify the structure Userdata in your version 0.8.22 of the solidity compiler.
Declaration of the problem:
In your current implementation, user names are sorted according to the sensitivity to cases when they historical in a database or the sending of data to a network. However, you want to maintain a case when you display user names for users.
Solution:
To resolve this problem, we will use the following approach:
- Define a new function in the Userdata
structure which accepts a chain parameter and returns a modified version.
- Call this function in your solidity code before stirring or recover data to guarantee the consistency of the cases.
- Update your user database to store and recover user names with their original case.
Modified "Userdata" structure:
Solidity
Pragma Solidity ^ 0,8,22;
Struct Userdata {
Chain username;
}
Modifyunername function (thong memory _username) public {
// call a function to convert the username to capital letters or lowercases, according to your requirement
bytes4 data = abi.encodewithsignatures ("Bytes Memory (_username)", "_username");
// Get the current case of the original username
Original string = Keccak256 (abi.encodepacked (_username));
// converted the original case into a hexadecimal chain
String convertedcase = abi.ecodepacked (originalCase);
// Store or recover the modified username in your database
}
'
Example of use:
Suppose you are building a user recording system and wanting to store user names with their original case:
Solidity
Pragma Solidity ^ 0,8,22;
Import "
Userdatabase contract {
// Initialize the database mapping user names to their corresponding addresses
Mapping (chain memory => address) useraddress useraddress;
Modifyusenname function (thong memory _username) Public payable {
// Convert the username to capital letters and store it in the database
bytes4 data = abi.encodewithsignatures ("Bytes Memory (_username)", "_username");
// Get the current case of the original username
Original string = Keccak256 (abi.encodepacked (_username));
// converted the original case into a hexadecimal chain
String convertedcase = abi.ecodepacked (originalCase);
// Store or recover the modified username in your database
useraddress [_username] = address (this); // Assuming that we use the SAFERC20 of OPENZEPPELIN for the storage of tokens
// Save a message for debugging purposes (optional)
Console.log ("modified username:", _username);
}
}
` ‘
In this examination, when you call the “Modifyusernam” function with an original case chain, it will be converted into a hexadecimal chain and stored in the “Useraddress” mapping. In this way, you make sure that user names are always stored in their original case.
Conclusion:
Using the solution provided, you have taken an important step to maintaining data consistency in different cases for your user database. Do not forget to update your solidity code to manage cases when you work with user names. If you have any other questions or need help with additional changes, do not hesitate to ask!
