cassandra database tutorial

sname= ' Tom ';Show (query) all records of Sname= ' Tom 'Select Sname,age from Stud;Display the specified field (column) in the Stud tableINSERT into stud values (' 1004 ', ' Zhang San ', 30);Insert a record into the stud tableDelete from stud where sname= ' Tom ';Delete the specified line-this is the row for Tom Sname.Update stud set sname= ' John Doe ' where sno= ' 1003 ';Modify the sname of the line Sno as ' 1003 ' to ' John Doe 'INSERT INTO stud (sno,sname) VALUES (' 1005 ', ' ronse ');Inse

The query method of Yii database and Yii database method This paper describes the query method of Yii database. Share to everyone for your reference, as follows: Two methods of querying are described here. One is direct query, one is to use the criteria to implement the query.Copy the Code code as follows: $user =user::model (); 1. Direct Enquiry: $arr =array (

After the project is published to the server, if the structure of the database changes at a later stage, how to update to the server?First, right click on the database and export the structure script fileCopy the script files and Mr.e.rar to the server, unzip the MR.E on the server, and run the "Update database structure. bat"Select the script file, select the

SQLite tutorial (1): SQLite database introduction, sqlite Database I. Introduction: SQLite is currently the most popular open-source embedded database. compared with many other embedded storage engines (NoSQL), such as BerkeleyDB and MemBASE, SQLite supports some basic features of relational databases, such as standard

*/Function error (){Return sqlite_error_string ($ this-> errno );}/**** @ Return int*/Function errno (){Return sqlite_last_error ($ this-> conn );}/*** Display the mysql tutorial error message*/Function halt ($ message = '', $ SQL = ''){Exit ("sqlitequery: $ SQLSqliteerror: ". $ this-> error ()."Sqliteerrno: ". $ this-> errno ()."Message: $ message ");} I hope this article will help you design PHP database

MongoDB database tutorial, mongodb tutorial 1. Install MongoDBHttps://www.mongodb.com/download-center? Jmp = navSelect a Stable version of the corresponding system for download (Current Stable Release)2. After installation, you need to create a configuration because you do not know where the database created by the e

MySQL database partition function tutorial, mysql tutorial Zero: What is database partition?Let's talk about what is a database partition. Take mysql as an example. The data in the mysql database is stored on the disk as a file, w

Database optimization tutorial (13) Other MySQL database Optimization MethodsVi. Other MySQL database Optimization Methods In the last chapter, we will talk about some optimization methods not mentioned above. 1. My. ini configuration file Here we will only introduce two of the most important ones. 1) configure t

final String create_tbl = "CREATE table logtable" + "(_id integer primary key autoincrement,name Text,url t Ext,desc text) ";//sqlitedatabase??? Private Sqlitedatabase Db;public DBHelper (context context) {Super (context, db_name, NULL, 2);} @Overridepublic void OnCreate (Sqlitedatabase db) {db.execsql (CREATE_TBL);} //?????? public void Open () {db = Getwritabledatabase ();} @Overridepublic void Onupgrade (sqlitedatabase db, int oldversion, int newversion) {//TODO auto-generated method stub}//

Navicat-Database management tools First, Introduction "1"Navicat is a powerful Visual database management tool for developing and managing databases such as Mysql,oracle,sql Server,sqlite "2"Navicat Premium is a Mac database management tool, connect this tool to the database, you can see the details of various datab

Migrate MySQL to MicrosoftSQLServer2000 (1)-database-related-PHP Tutorial. Migration of MySQL to Microsoft SQL Server 2000 abstract this white paper describes the migration capability of Microsoft SQL Server and provides help for developers to migrate MySQL databases to SQLSe to Microsoft SQL Server. Summary This white paper describes the migration capabilities of Microsoft SQL Server 2000 and provides spec

PostgreSQL tutorial (14): database maintenance, postgresql tutorial I. Disk Space Restoration: In PostgreSQL, the data rows deleted or updated using the delete and update statements are not actually deleted, the physical address of the old data row sets the row status to deleted or expired. Therefore, when data in a data table changes frequently, the space occupi

New user and associated database tutorial, sqlserver Database We often need to create a user with permissions on the database. This user can only operate on a specific database (for example, this user can only read, write, and so on ), so how should we set it on sqlserver?