Posts (page 113)
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5 min readTo connect Oracle database with Node.js, you can use the 'oracledb' module which is the official Node.js driver for Oracle Database.First, you need to install the 'oracledb' module by running the command 'npm install oracledb' in your Node.js project directory.Then, you can establish a connection to the Oracle database by providing the connection details such as user, password, host, port, and service name in the configuration object.
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4 min readIn Rust, the if return construct is allowed because of the language's design philosophy that favors explicitness and readability. This means that the Rust compiler is able to interpret and process if return statements in a way that makes sense and does not lead to ambiguity in the code. This feature allows developers to write concise and straightforward code that can help improve code readability and maintainability.
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5 min readTo check the language of a column value in Oracle, you can use the NLS_SESSION_PARAMETERS view to determine the language settings for the current session. This view provides information about the language, territory, and character set settings that are in effect for the session. You can query this view to see the language-related parameters such as NLS_LANGUAGE, NLS_TERRITORY, and NLS_CHARACTERSET.
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6 min readTo extract data from form-data in Rust, you can use the actix-web or rocket framework, which provide built-in support for parsing form data. You can also use the multipart crate to manually parse the form data. This crate allows you to extract data from multipart form requests. Simply parse the form data in your Rust application and extract the values based on the form field names. You can then use this data for further processing or validation in your application.
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4 min readTo join two tables in Oracle SQL, you can use the SQL JOIN clause. This allows you to combine rows from two or more tables based on a related column between them.There are different types of joins you can use, such as:INNER JOIN: Returns rows when there is a match between the columns in both tables.LEFT JOIN (or LEFT OUTER JOIN): Returns all rows from the left table and the matched rows from the right table. If there is no match, NULL values are returned from the right table.
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3 min readTo print SSH output in Rust, you can use the std::process::Command module to execute the SSH command and read its output. Here's an example code snippet: use std::process::Command; fn main() { let output = Command::new("ssh") .args(&["user@host", "ls"]) .output() .expect("Failed to execute command"); if output.status.success() { let stdout = String::from_utf8(output.stdout) .
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6 min readIn Rust, it is not possible to have a struct with a randomly-sized byte array directly inside it. However, you can achieve a similar effect by using a fixed-size array with additional fields to keep track of the actual size of the data in the array.One common approach is to use a fixed-size array along with a separate field to store the actual size of the data.
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5 min readTo disable a sequence in Oracle, you can use the ALTER SEQUENCE statement.First, connect to your Oracle database using a tool like SQL*Plus or SQL Developer. Then, run the following SQL command:ALTER SEQUENCE sequence_name DISABLE;Replace "sequence_name" with the name of the sequence you want to disable. This command will prevent the sequence from generating new values.
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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.