java-DB Transaction class in combination with C3P0 package

Bind the Connection object to the current thread so that the link can be used in each method.

Datasourceutils.java

Package Com.itheima.utils;import Java.sql.connection;import Java.sql.resultset;import java.sql.SQLException;import Java.sql.statement;import Javax.sql.datasource;import Com.mchange.v2.c3p0.combopooleddatasource;public Class datasourceutils {private static Combopooleddatasource ds=new Combopooleddatasource ();p rivate static threadlocal< Connection> tl=new threadlocal<> ();/** * Get Data source * @return Connection pool */public static DataSource Getdatasource () {return DS ;} /** * Get connection from current thread * @return connection * @throws SQLException */public static Connection getconnection () throws Sqlexception{connec  tion conn = Tl.get (); if (conn==null) {///First get create a connection and current thread bindings conn=ds.getconnection (); Bind Tl.set (conn);} Return conn;} /** * FREE Resources * * @param conn * connection * @param ST * Statement Performer * @param RS * result set */public static VO  ID Closeresource (Connection conn, Statement St, ResultSet rs) {Closeresource (St, RS); Closeconn (conn);} public static void Closeresource (Statement St, ResultSet rs) {CloseresulTset (RS); closestatement (ST);} /** * Release Connection * * @param conn * connection */public static void Closeconn (Connection conn) {if (conn! = null) {try {conn. Close ();//and current thread unbind Tl.remove ();} catch (SQLException e) {e.printstacktrace ();} conn = null;}} /** * Release Statement performer * * @param St * statement performer */public static void Closestatement (Statement st) {if (st! = null) {try {s T.close ();} catch (SQLException e) {e.printstacktrace ();} st = NULL;}} /** * Release Result set * * @param RS * result set */public static void Closeresultset (ResultSet rs) {if (rs! = null) {try {rs.cl OSE ();} catch (SQLException e) {e.printstacktrace ();} rs = null;}} /** * Open transaction * @throws SQLException */public static void StartTransaction () throws sqlexception{//get connection//Open transaction getconnection () . Setautocommit (false);} /** * Transaction commit */public static void Commitandclose () {try {//get connection Connection conn = getconnection ();//COMMIT Transaction Conn.commit ();// Release resource Conn.close ();//unbind Tl.remove ();} catch (SQLException e) {e.printstacktrace ();}} /** * Transaction rollback */public static void rollbAckandclose () {try {//get connection Connection conn = getconnection ();//Transaction rollback conn.rollback ();//Release Resources conn.close ();// Unbind Tl.remove ();} catch (SQLException e) {e.printstacktrace ();}}}

java-DB Transaction class in combination with C3P0 package