net embedded database

} $ } - - - //Console.WriteLine ("Number of rows affected: {0}", affects); A + //Close the database connection after the database operation is complete the connection. Close (); - $ the } the Catch(Exception ex) the { the Console.WriteLine (ex. Message); - Throw; in } the

. NET provides four Database Connection Methods:System. Data. oledb. oledbconnectionSystem. Data. sqlclient. sqlconnectionSystem. Data. ODBC. odbcconnectionSystem. Data. oracleclient. oracleconnection Access: User ID = admin; Data Source = "/> Program Medium: connect "sqlconnstring" and "dbpath" to a conn_string_non_dtc"Public static readonly string conn_string_non_dtc = system. configuration. configuration

Introduction if you have worked in a large group of companies, you will have the opportunity to access MySQL, although it does not support transaction processing, stored procedures, however, the functions provided by MySQL can satisfy most of your needs. In addition, simple MySQL has some unique advantages. In some cases, it is faster than large databases. So how to access the MySQL database in. Net? Maybe

program | stored Procedure | data | database A Objective: A stored procedure (Stored Procedure) is a set of SQL statements that are compiled and stored in a database in order to complete a specific function. The user executes it by specifying the name of the stored procedure and giving the parameter (if the stored procedure has parameters). Stored procedures are an important object in a

Use EF Core in the. NET Core class library to migrate the database to SQL Server, coreefPreface If you just use EntityFramework Core as the orm framework, you may encounter database migration problems. At first, I was in ASP. NET Core Web project, but later found that it is not very reasonable to put it here, some

be tostring () or equals (null) because the objects are not actually columned. That is to say, the returned results have no effect. 3. Execute the SQL statement using the executereader method (if the SQL statement is a SELECT query) to return a set of query results. The type is system. data. oledb. oledbdatareader. You can use this result to obtain the queried data. If (If SQL is not a query select), a set of system. Data. oledb. oledbdatareader types (EOF) without any data is returned) Iv. S

Method One:Using MySQL's connector/net component, MySQL, which is a. NET private access component designed by MySQL to access the MySQL database for ADO. After you complete the component, you need to reference the component in your project, or you can add the following node directly within the After you reference the namespace MySql.Data.MySqlClient in your progr

Vb.net-based database access-ADO. NET (1) The name of ADO. NET originated from ADO (ActiveX Data Objects) and is a COM component library used to access Ask data. When I first came into contact with ADO. NET, I felt that it had powerful functions when accessing the database.

Tips-save ASP. Net sessions on the database server, and-asp. netsession Reference blog: http://www.cnblogs.com/lykbk/archive/2013/01/13/hf576856868.html Web Form web pages are based on HTTP and are stateless, which means they do not know whether all requests come from the same client computer, whether the web pages are damaged and refreshed, in this way, information may be lost. As a result, status manageme

folder} catch (e) {alert ("Save failed, refresh this The page tries again!"); } finally {window.location.reload (); } }This method requires the browser to create an ActiveX, which requires an ActiveX control with an unknown signature checked. However, this will reduce the security of the browser. So it's always a hint to prompt the user to restore the default security settings when the browser is opened. Suppose you are not very aware that you cannot create an object of Word a

This article mainly introduces. NET environment, if you want to access the MySQL database in. if you are interested in the actual operation solution in the. NET environment, you can better understand it through the following articles. If you have not worked in a large group of companies, you will certainly have the opportunity to access MySQL (the best combinatio

when a team is developing a formal project because the add-migration command is a good place to track updates to the database structure and can be rolled back as appropriate. Updating the database automatically results in a change in the database structure, and if multiple people use the same database in the team's wo

1. system. Data. oracleclient and system. Data. oledb namespaces AlthoughHowever, the Oracle database can be accessed through the classes in the two namespaces, but similar to SQL Server (system. Data. sqlclientThe namespace class efficiency is higher than that in the system. Data. oledb namespace), system. Data. oracleclientThe class in the namespace is more efficient than the class in the system. Data. oledb namespace (I did not personally verify t

ASP. NET Database Cache dependencyMore often, our server performance loss is still in the query database, so the database cache is particularly important, the above several ways can be implemented in some data caching functions. But the problem is that our data is sometimes changing so that the data that the user might

create a lookupcodes table that returns the objects that are not materializedMyconnection.close ();}2. ExecuteScalar (): Execute SQL, (if SQL is query Select) returns the first column of the first row of the query result, if (if SQL is not a query select), returns the object not materialized because the object is not materialized, so the return result cannot be ToString (), cannot be equals (null), which means that the return result has no effect3, the ExecuteReader method executes SQL, (if SQL

One MDB database is another file on the hard disk. Therefore, like other files, it will also encounter the same file access license problem. This problem means to read (and write, as you will see later in this book) database files, the application running on the page must have the relevant license to read (and write) the file in Windows.So far, the reason why the pages in the example can "run normally" is t

One mdb database is another file on the hard disk. Therefore, like other files, it will also encounter the same file access license problem. This problem means to read (and write, as you will see later in this book) database files, applications running on the pageProgramYou must have the relevant license to read (and write) the file in windows. So far, the reason why the pages in the example can "run norm

Connecttion object, command objectConnecttion is divided into SQL. NET and oledb. NET data to provideProgram, The former is mainly connected to the SQL Server database, and the latter is used to connect to databases other than SQL Server. SQL .net data provider: sqlconn = new sqlconnection ("Server =;

Document directory Supported Data Types PostgreSQL is a widely used free and open source database. Compared with MySQL, PostgreSQL is more suitable for complicated enterprise computing tasks. MySQL is more widely used in the Internet field, postgreSQL supports the most data types, including array and IP address types. You can use C, SQL, PL/pgsql, phython, and other methods to write powerful custom functions, therefore, it is particularly suita

ASP. NET MVC4 database connection (EF6.0), mvc4ef6.0 My blog original address: http://www.star110.com/Note/ReadArticle? Id = 52 title = ASP. NET + MVC4 + % E6 % 95% B0 % E6 % 8D % AE % E5 % BA % 93 Environment:. NET MVC4 + EF6.0 There are many ways to connect to the database