conns con

Dbconnectionpool is described in detail as follows: I. Construction of Dbconnectionpool constructor to obtain all of the above parameters: Public Dbconnectionpool (string name, string URL, String user, String password, int maxconn) { THIS.name = name; This. url = URL; This.user = user; This.password = password; This.maxconn = Maxconn; } Save all parameters in the instance variable. Second, open a connection from the pool Dbconnectionpool provides two ways to chec

specifications mentioned above. // Context (Environment) role, which uses hashmap to store the value corresponding to the variableClass Context{Private map valuemap = new hashmap ();Public void addvalue (variable X, int y){Integer YI = new INTEGER (y );Valuemap. Put (x, Yi );}Public int lookupvalue (variable X){Int I = (integer) valuemap. Get (x). intvalue ();Return I;}}// Abstract expression role, which can also be implemented using interfacesAbstract class expression{Public abstract

sender, system. eventargs E){Int recordpos = (INT) session ["recordpos"];Tbscore. Text = dsstudent1.tbstudentinfo. Rows [recordpos] ["score"]. tostring ();} Simple connection exampleSimply bind a labelPrivate void page_load (Object sender, system. eventargs E){If (! Ispostback){Arraylist AR = new arraylist ();Ar. Add ("red ");Ar. Add ("blue ");Ar. Add ("green ");Ar. Add ("orange ");Ddlcolor. datasource = Ar;}This. databind ();} Private void btnadd_click (Object sender, system. eventargs E){St

Original program /*** Execute multiple SQL statements and finally submit* @ Param sqls* @ Return* @ Throws exception*/Public static int executefor (list sqllist) throws exception {Int I =-1;Connection con = NULL;Preparedstatement pstmt = NULL;Try {// Create a connectionCon = connectionmanager. getinstance (). getconnection ();Con. setautocommit (false );For (int ii = 0; II Pstmt =

Detailed descriptions of four functions of mysql_result mysql_fetch_row mysql_fetch_array mysql_fetch_object in php Mysql tutorial _ result (): The advantage lies in ease of use; its disadvantage is that there are few functions. One call can only obtain one row of elements in the result dataset, which is less efficient for large-scale database tutorials; The value of a field in the returned result set returned by the mysql_result () function. If successful, the function returns the field value.

Package three.day.frame; Import java.awt.*;Import java.awt.event.*;Import java.awt.geom.*;Import java.io.*;Import java.util.*;Import javax.swing.*; Class Point1 implements Serializable {int x, position of y;//mouseColor col;//Paint Selected colorsint tool;//Paint Select which graphic to drawint boarder;//line width Point1 (int x, int y, Color col, int tool, int boarder) {this.x = x;This.y = y;This.col = col;This.tool = tool;This.boarder = boarder;}} Class Paintboard1 extends Frame implements

$ Con10; $ row20; functionnumbers ( amp; $ con, $ row) {code ...}} numbers ($ con, $ row); echo $ con; $ con = 10; $ Row = 20; Function numbers ( $ con, $ row ){ // global $con; $con =

MySql performs the JDBC join (Add/delete/modify/query) Operation Video address: http://www.tudou.com/programs/view/4GIENz1qdp0/ Create BaseDao Package cn. wingfly. dao; import java. SQL. connection; import java. SQL. driverManager; import java. SQL. resultSet; import java. SQL. SQLException; import java. SQL. statement; public class BaseDao {Connection con = null; Statement st = null; ResultSet rs = null;/*** get join ** @ return */public Connection g

Video Address: http: wwwtudoucomprogramsview4GIENz1qdp0 create BaseDaopackagecnwingflydao; importjavasqlConnection; importjavasqlDriverManager; importjavasqlResultSet; importj video address: http://www.tudou.com/programs/view/4GIENz1qdp0/ Create BaseDao Package cn. wingfly. dao; import java. SQL. connection; import java. SQL. driverManager; import java. SQL. resultSet; import java. SQL. SQLException; import java. SQL. statement; public class BaseDao {Connection

database.Using system. Data. oledb; /// /// This is mainly the database connection class used in the message book. because there are not many data operations, the conventional operation classes are also put here./// Public class ODB{Public string name;Public String email;Public String QQ;Public String MSN;Public String URL;Public String title;Public String concent;Public String face;Public String IP;Public String PWD;Public String uid;Public String pwda;Public datetime DTT;Public ODB (){//// T

instance;}Private void init (){InputStream is = getClass (). getResourceAsStream ("db. properties ");Properties dbProps = new Properties ();Try {DbProps. load (is );}Catch (Exception e ){System. err. println ("Can not read the properties file." +"Make sure db. properties is in the CLASSPATH ");Return;}LoadDrivers (dbProps );CreatePools (dbProps );}Public void freeConnection (String name, Connection con ){DBConnectionPool pool = (DBConnectionPool) poo

is mainly the database connection class used in the message book. because there are not many data operations, the conventional operation classes are also put here./// Public class odb{Public string name;Public string email;Public string qq;Public string msn;Public string url;Public string title;Public string concent;Public string face;Public string ip;Public string pwd;Public string uid;Public string pwda;Public DateTime dtt;Public odb (){//// TODO: add the constructor logic here//}Public stati

Private void tcustomer_click (Object sender, system. Web. UI. imageclickeventargs E){Sqlconnection con = new sqlconnection (configurationsettings. receivettings ["CNN"]);Con. open ();String sq1l = "select count (field_value) from I _defaultvalue where table_name = 'system' and table_field = 'System _ init_setup 'and field_value = 'T '";Sqlcommand cmd1 = new sqlcommand (sq1l,

MySql performs the JDBC join (Add/delete/modify/query) operation, and mysqljdbc Video address: http://www.tudou.com/programs/view/4GIENz1qdp0/ Create BaseDao Package cn. wingfly. dao; import java. SQL. connection; import java. SQL. driverManager; import java. SQL. resultSet; import java. SQL. SQLException; import java. SQL. statement; public class BaseDao {Connection con = null; Statement st = null; ResultSet rs = null;/*** get join ** @ return */pu

. button (self, label = 'login', pos = (80,145), size = (130, 30) self. loginButton. bind (wx. EVT_BUTTON, self. login) self. show () def login (self, event): 'logon process' try: serverAddress = self. serverAddress. getLineText (0 ). split (':') con. open (serverAddress [0], port = Int (serverAddress [1]), timeout = 10) response = con. read_some () if response! = 'Connect Success ': self. showDialog ('erro

ADO. NET provides connection to connect to the database and command object to query the database. Like the connection object, there are two types of commands: oledbcommand and sqlcommand. The difference is the same as that of the connection object. To manipulate the database, you must first use connection to connect to the database, and then create a command to query. There are several creation methods, for example: Sqlcommand cmd; String strcon = "Server = localhost; database = northwind; trust

The details are as follows:To allow PHP to execute the preceding statement, we must use the mysql_query () function. This function is used to send queries or commands to MySQL connections.ExampleIn the following example, we created a database named "my_db: The code is as follows:Copy code $ Con = mysql_connect ("localhost", "peter", "abc123 ");If (! $ Con){Die ('co