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Database Setup and Configuration This guide demonstrtaes how to implement basic CRUD operations using MyBatis. We'll use a student management system as our example. Database Initialization CREATE DATABASE `test` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci; CREATE TABLE `student` ( `id` INT NOT NULL AUTO_INCREMENT, `name` VARCHAR ...

Adding New Fields to a Table Use ALTER TABLE with ADD COLUMN (or simplified ADD) to append new fields. You can specify optional default values to handle existing records. alter_stmt = ''' ALTER TABLE automotive_dealer_locations ADD COLUMN (legal_business_name VARCHAR(120) DEFAULT NULL, paid_in_capital VARCHAR(120) DEFAUL ...

UNION operations combine results from multiple tables while eliminating duplicate records: <resultMap id="TransactionResult" type="com.example.Transaction"> <id column="txn_id" property="id"/> <result column="order_ref" property="orderReference"/> <result col ...

MongoDB is a C++-built NoSQL database focused on distributed document storage, delivering stable, high-performance, scalable data storage for web applications. Core MongoDB Characteristics Schema-free: Documents with varying structures can coexist in a single collection Collection-oriented storage: Optimized for JSON-like BSON data formats Ful ...

One-to-One Association (OneToOneField) from django.db import models class Author(models.Model): full_name = models.CharField(max_length=32) profile = models.OneToOneField(to="AuthorProfile", on_delete=models.CASCADE) class AuthorProfile(models.Model): residential_addr = models.CharField(max_length=128) Object-based cros ...

Nullable types are a special category of data types in C# that can hold either a regular value or a null value. They are particularly useful when dealing with values that may be absent or undefined in a program's context. The syntax for declaring a nullable type involves appending a question mark to the underlying value type, such as int? or bo ...

Redis Setup and Client Access Install Redis, then launch the interactive client and confirm connectivity. String Type Commands Work with key-value pairs where the value is treated as text or numeric data. Assign a value to a key: SET itemA 8 Retrieve the stored value: GET itemA Increment numeric content by one: INCR itemA Decrement nu ...