mysql odbc connection string

/slave configuration ################ Master: 192.168.1.51 Slave: 192.168.1.50 1. master configuration /Etc/my. cnf Binlog-do-db = book is the database name Ensure Server-id = 1 Log-bin = mysql-bin Authorize the rep user to perform the copy operation Grant replication slave on book. * TO rep@192.168.1.50 identified by '2013 '; Restart the master service 2. configure slave Vi/etc/my. cnf Set the following four lines Server-id = 2 Master-host = 192.168.

. Mysql> select length (COMPRESS (REPEAT ('A', 1000);-> 21 mysql> select length (COMPRESS ('')); -> 0 mysql> select length (COMPRESS ('A');-> 13 mysql> select length (COMPRESS (REPEAT ('A', 16);-> 15 The content of the compressed string is stored as follows: Empty strings

compression library such as zlib. Otherwise, the return value is always NULL. UNCOMPRESS () can extract compressed strings. Mysql> select length (COMPRESS (REPEAT ('A', 1000 ))); -> 21 Mysql> select length (COMPRESS ('')); -> 0 Mysql> select length (COMPRESS ('A ')); -> 13 Mysql> select length (COMPRESS (REPEAT ('A',

monitor the connection errors and react accordingly. The Mysqli expansion pack contains many features that can be used to catch error messages, or you can use exceptions to do this. For example, you can use the Mysqli_connect_errno () and Mysqli_connect_error () methods to diagnose and display information about a MySQL connection error. Specific information abou

: select count(*) from employee; Used with group select d_id,count(*) from employee group by d_id; The preceding statements are grouped before statistics. 2) sum () functionThe sum () function is the sum function.Instance: select num,sum(score) from grade where num= 1001;select num,sum(score) from grade group by num; Sum () can only calculate numeric fields.3) avg () functionAvg () is an average function.Instance: select avg(age) from employee;select course,avg(score) from group by course; 4) ma

with ODBC; Object-oriented: the ability to encapsulate frequently used JDBC database connections into a class that can be invoked directly when used. disadvantages such as the following: The speed of access to data records has been affected to a certain extent; Changing the data source is difficult: JDBC supports multiple databases, and the operations between the various databases are different, which can cause a lot of trouble

able to leverage the JDBC API to create bridges between Java programs and data sources. The application needs to be written only once and can be moved to various drivers for execution. Sun provides a driver manager, and database vendors-such as MySQL, Oracle-provide drivers that meet the requirements of the driver Manager to be recognized and work correctly. Therefore, JDBC is not limited by the database vendor.The JDBC API can be used as a link betw

1. name= "MySQL" connectionstring= "localhost"Providername= "System.Data.SqlClient"/>string s = system.web.configuration.webconfigurationmanager.connectionstrings["mysql"]. ToString ();2. Key= "MongoDB" value= "Mongodb:localhost"/>string s = system.configuration.configurationmanager.appsettings["mongodb"]. ToString ();

Java simple MySQL database connection addition, deletion, modification, query 1. connect to the database and obtain the database connection variable [Java]View plaincopyprint? // Note that this is the method for connecting to mysql // Note that this is the method for connecting to

1. Install unixodbc and MySQL ODBC Connector Yum install unixodbc-devel mysql-connector-ODBC 2. Create a soft connection Ln-s libmydbc5.so libmyodbc. So 3. Create the Database "freeswitch" on the remote MySQL server and create a

, SPWD);6. Microsoft SQL Server (http://www.microsoft.com)Class.forName ("Com.microsoft.jdbc.sqlserver.SQLServerDriver");cn = Drivermanager.getconnection ("Jdbc:microsoft:sqlserver://mydbcomputernameorip:1433;databasename=master", SUSR , spwd);7. ODBCClass.forName ("Sun.jdbc.odbc.JdbcOdbcDriver");Connection cn = Drivermanager.getconnection ("JDBC:ODBC:" + sDsn, SUSR, spwd);8.db2Class.forName ("Com.ibm.db2.jdbc.net.DB2Driver");