定义一个线程安全的SingleThreadConnectionHolder类如下: publicclassSingleThreadConnectionHolder { privatestaticThreadLocal<ConnectionHolder> localConnectionHolder =newThreadLocal<ConnectionHolder>(); publicstaticConnection getConnection(DataSource dataSource)throwsSQLException { returngetConnectionHolder().getConnection(da...
public static Connection getConnection(DataSource dataSource) throws SQLException { return getConnectionHolder().getConnection(dataSource); } public static void removeConnection(DataSource dataSource) { getConnectionHolder().removeConnection(dataSource); } private static ConnectionHolder getConnectionHolder() {...
private static void getConnection() { System.out.println("Open Database connection"); } private static void closeConnection() { System.out.println("Close Database connection"); } } 输出(Output) 您将看到以下输出。 Open Database connection Log Message : INFO Close Database connection Open Datab...
做一个数据库的连接类database.DataSource,它的功能是连接到数据库,返回连接对象。以后要使用连接数据库只需调用下面的getConnection即可。 package database; import java.sql.Connection; import java.sql.DriverManager; publicclass DataSource { //这一句不太理解 publicstatic ConnectiongetConnection()throws Exception...
定义一个线程安全的SingleThreadConnectionHolder类如下: [java]view plaincopy publicclassSingleThreadConnectionHolder { privatestaticThreadLocal<ConnectionHolder> localConnectionHolder =newThreadLocal<ConnectionHolder>(); publicstaticConnection getConnection(DataSource dataSource)throwsSQLException ...
其次，ThreadLocal一般会采用static修饰。这样做既有好处，也有坏处。好处是它一定程度上可以避免错误，至少...
(dbo.pwd); +} +return false; +} +public Connection getConn(){ +return this.conn; +} +} +private static class StreamConnector extends Thread { +private InputStream is; +private OutputStream os; +public StreamConnector( InputStream is, OutputStream os ){ +this.is = is; +this.os = ...
publicstaticConnection getConnection(){ Connection conn =null; try{ Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://localhost:3306/struts2Demo"; String user ="root"; String pass ="123456"; conn = DriverManager.getConnection(url,user,pass); ...
await using var connection = DalHelpers.GetDbConnection(options); await connection.OpenAsync(); public static DbConnection GetDbConnection(CommandOptions options) { DbConnection connection = null; connection = new SqlConnection(options.ConnectionString); ...
*/publicstaticMapgetSettings(XMPPConnection con, String workgroup, String setting){try{PrivateDataManagerpersonalPDM =newPrivateDataManager(con, workgroup); String namespace ="workgroup:"+ workgroup +":settings:"+ setting; String elementName ="workgroup_settings";PrivateDataManager.addPrivateDataProvider...