What are data access classes? Data access class instance summary

using System; using System.Data; using System.Data.SqlClient; namespace SysClassLibrary { ///

/// Summary description of DataAccess.​ /// Data processing base class, calling method: DataAccess.DataSet((string)sqlstr); or DataAccess.DataSet((string)sqlstr,ref DataSet ds); ///&nbs

1. Detailed explanation of ASP.NET data access class code

##Introduction: ASP.NET Data Access Class

2. Winform Operation Access

Introduction: Sometimes when transferring data, large databases such as SQL Server and Oracle are a bit overkill and will increase maintenance costs. In this case, you can use the Access database, especially when dealing with Winform. Let's briefly talk about how to use Access's data access class. This class is a static method. If it is a multi-threaded program, it may cause database connection problems.

3. php Introduction to using mb

: Recently, for the sake of security, a safe insertion and safe update method has been added to the data access class. Before data is inserted, dangerous strings are filtered and the data type and length are checked. The problem arises. In terms of length check, the database uses varchar, and the length is calculated based on the number of characters. For example, abcdef counts as 6 characters, and 123456 also counts as 6 characters. And

4. High performance Javascript note data storage and access performance optimization_javascript skills

##Introduction: In JavaScript, the storage location of data has an important impact on the overall performance of the code. There are four data access types: direct variables, local variables, array items, and object members

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