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6 min readTo set the origin header for a websocket client in Rust, you can use the Request::header() method provided by the websocket::ClientBuilder crate. This allows you to add custom headers to the websocket client request. To set the origin header specifically, you can do the following: use websocket::ClientBuilder; use std::collections::HashMap; let client = ClientBuilder::new("wss://example.com") // Specify the websocket server URL .header("Origin", "https://example.
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3 min readIn Oracle, exceptions can be handled in a package by using the traditional PL/SQL exception handling mechanism. This involves using the "EXCEPTION" block within the package to catch specific exceptions and handle them accordingly.Exceptions can be raised within the package using the "RAISE" statement. Once an exception is raised, the exception block can be used to handle the exception by providing specific handling logic.
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7 min readIn Rust, the error message "operator cannot be applied to type" occurs when you try to use an operator on a type that does not support it. This typically happens when you are trying to perform an operation, such as addition or subtraction, on types that do not have the necessary traits implemented for that operator.To fix this error, you need to make sure that the types you are operating on have the appropriate traits implemented.
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5 min readTo check if a column already exists in Oracle, you can query the data dictionary views in the Oracle database.
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6 min readTo generate a Rc from a reference to T in Rust, you can use the Rc::clone method. This method creates a new reference-counted pointer to the same underlying data as the original reference. Here's an example: use std::rc::Rc; fn main() { let data = String::from("Hello, Rust!"); let ptr = Rc::new(&data); let cloned_ptr = Rc::clone(&ptr); println!("Original data: {}", *ptr); println.
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7 min readTo implement a trait on an integer type in Rust, you first need to define the trait using the trait keyword followed by the trait name and its methods. Then, you can implement the trait for a specific integer type by using the impl keyword followed by the trait name and the integer type. Inside the impl block, you can define the implementation of the trait methods for that particular integer type. You can then use the methods defined in the trait on instances of the integer type.
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4 min readInvalid identifier errors in Oracle typically occur when you try to reference a table, column, or object that does not exist in the database. To avoid these errors, make sure you double-check the spelling of the identifier in your SQL statements. It's also important to be aware of the scope of your identifiers, as they may not be accessible in certain contexts.
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3 min readTo break out of a loop in Rust and return a value, you can use the break keyword to exit the loop and the return keyword to return a value from the function containing the loop. By combining these two keywords, you can break out of the loop and immediately return a value. Just make sure to place the value you want to return after the return keyword. This way, you can effectively break out of a loop and return a value in Rust.
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5 min readIn Oracle functions, dividing by zero can result in a runtime error. To handle this situation, you can use the NULLIF function in combination with a conditional statement to check if the denominator is zero before performing the division operation. By using NULLIF, you can return a NULL value instead of an error when dividing by zero. This allows you to handle the divide by zero scenario gracefully and continue with the function execution without crashing.
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7 min readIn Rust, the Specification Pattern can be implemented by defining a trait that represents the specification interface. This trait should have a single method that takes a reference to an object and returns a boolean value indicating whether the object meets the criteria specified by the specification.You can then create concrete implementations of this trait for different types of specifications. These implementations can check specific conditions on the object and return the result accordingly.
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8 min readTo fix the "ORA-01735: invalid ALTER TABLE option" error in Oracle 11g, you can follow these steps:Check the syntax of your ALTER TABLE statement to make sure it is correct according to the Oracle 11g documentation. Make sure you are using valid options for the ALTER TABLE command. Common options include adding columns, modifying columns, dropping columns, and adding constraints. Check if there are any typos or errors in your ALTER TABLE statement that may be causing the error.