prompter: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens

assistant: This error means that your SQL statement has ? parameters (placeholders for bound variables), but you didn't actually bind that many variables to the statement.
For example, if your SQL was:
SELECT * FROM users WHERE id = ? AND name = ?

Then you'd need to bind two variables to the statement - likely with a call like:
stmt.bind_param('ii', $id, $name)

But if you only bound one variable, you'd get this HY093 error since the number of bound variables (1) doesn't match the number of tokens (2) in the SQL.
So you just need to ensure you bind the correct number of variables to match the number of placeholders in your SQL statement.

prompter: How do determine how many placeholders I have?

assistant: The number of placeholders in an SQL statement can be determined by counting the number of ? parameters in it. For example, in my previous example there are two parameters which are ? parameters: "id = ?" and "name = ?".
By changing one parameter to a fix value it would have only one placeholder. For example:
SELECT * FROM users WHERE id = ? AND name = "John Doe"

As you can see, in this modified SQL statement the "name" parameter was changed to "John Doe" from a placeholder, so now only the "id" parameter is a placeholder.

assistant: Invalid parameter number: number of bound variables does not match number of tokens is an error message typically encountered in PHP programming when using the PDO (PHP Data Object) extension to interact with a database. This error occurs when the number of placeholders in an SQL query does not match the number of actual values being passed to the query. Placeholders are used to represent values that will be dynamically filled in at runtime, and must match the number of values passed to the query in order for the query to execute correctly.

assistant: One of the reason might be that you could've declared a binding called :numRows but you never actually bind anything to it.

prompter: and how can I solve this mistake?

assistant: You can resolve the issue by ensuring that the number of variables being passed to the query matches the number of placeholders in the query. To do this, you can do the following:

1. Count the number of placeholders in your query (e.g. :numRows).

2. Count the number of variables being passed to the query (e.g. $numRows).

3. Ensure that both numbers match. If they don't, add or remove placeholders or variables as necessary.

For example, if your query looks like this:

$query = "SELECT * FROM table WHERE column = :numRows";

And you are passing in a single variable, $numRows, then the query should work without errors. If you are passing in multiple variables, you will need to add additional placeholders for each variable in your query.

prompter: give the above json     
{
    "service_name":"gakaki"
    "envs" : [
        {
            "name":"latest",
            "target_url":"http://baidu.com",
            "base_url": "http://baseapi.gakaki.com"
        }
    ]
}

please generate the rust actix crud code

assistant: SQL query matches the number of values that you're binding to the placeholders. Here are a few steps that you can follow to resolve this error:

Check the SQL statement: Make sure that your SQL statement has the correct number of placeholders for the values that you're binding.

Check the values being bound: Make sure that you have the correct number of values that match the number of placeholders in the SQL statement.

Use named placeholders: Instead of using question marks as placeholders, you can use named placeholders (e.g. :name) and bind values to them using an associative array. This can make it easier to keep track of the placeholders and values.

Use error handling: Use a try-catch block to catch and handle any exceptions that might occur during the execution of your code. This can help you identify and debug any errors more easily.

Example:
try {
   $stmt = $pdo->prepare($sql);
   $stmt->execute($values);
} catch (PDOException $e) {
   echo "Error: " . $e->getMessage();
}

By following these steps, you should be able to resolve the "Invalid parameter number" error in your PHP code.

prompter: Thanks, It worked! But now I have a different problem.

Suddenly, I'm getting the following error when I try to connect to my database from PHP:

> Connect Error: SQLSTATE[HY000] [2054] The server requested authentication method unknown to the client

PHP might show this error

> Warning: mysqli_connect(): The server requested authentication method unknown to the client [caching_sha2_password] in D:\xampp\htdocs\reg\server.php on line 10

How can I fix this problem?

assistant: You probably have a SQL-query in your code along the lines of:
```
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (?, ?, ?)");
$stmt->execute(['John Doe', 'john.doe@example.com']);
```

Notice how the amount of placeholders (`?`) does not match the amount of parameters ('name', 'email') in the query.

To fix this you can either:
1. Remove one placeholder from the statement
```
$stmt = $pdo->prepare("INSERT INTO users (name, email) VALUES (?, ?)");
```
2. Add a parameter to the statement
```
$stmt = $pdo->prepare("INSERT INTO users (name, email, password) VALUES (?, ?, ?)");
```

I hope this answer is helpful to you. Please do not hesitate to ask me any further questions.