Shulou(Shulou.com)06/02 Report--

How to carry out JDBC case analysis, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain for you in detail, people with this need can come to learn, I hope you can gain something.

Example 1 of JDBC, first configure the following in the configuration file (system.properties):

Driver=com.microsoft.sqlserver.jdbc.SQLServerDriver url=jdbc:sqlserver://localhost:1433;databaseName=mp username=sa password=mengya

JDBC example 2, wrote a utility class for SQLDB

PublicclassSQLDBConnection {privateInputStreaminputstr; privatePropertiespro; privatestaticSQLDBConnectionsqldb=null;// private constructor privateSQLDBConnection () {inputstr=this.getClass (). GetResourceAsStream ("/ system.properties"); pro=newProperties (); try {pro.load (inputstr);} catch (IOExceptione) {e.printStackTrace ();} try {Class.forName (pro.getProperty ("driver")); / / register the driver, only once} catch (ClassNotFoundExceptione) {e.printStackTrace () }} / / Singleton pattern publicstaticSQLDBConnectiongetSQLDBConnection () {if (sqldb==null) {synchronized (SQLDBConnection.class) {if (sqldb==null) {sqldb=newSQLDBConnection ();} returnsqldb;} / / get the connection to the database publicConnectionGetConnection () {Connectionconn=null;try {conn=DriverManager.getConnection ("url"), pro.getProperty ("username"), pro.getProperty ("password");} catch (SQLExceptione) {e.printStackTrace ();} returnconn;}

Example 3 of JDBC, write the interface of Studao

/ / release resource publicstaticvoidfree (ResultSetrs,Statementsta,Connectionconn) {try {if (rswatches null) {rs.close ();}} catch (Exceptione) {e.printStackTrace ();} finally {try {if (staple null) {sta.close ();}} catch (Exceptione) {e.printStackTrace ();} finally {if (connexual null) {try {conn.close ();} catch (SQLExceptione) {e.printStackTrace () } publicinterfaceStudaointer {publicvoidaddStu (Stustu); publicvoiddelStu (intsid); publicvoidupdStu (Stustu); publicStugetOneStu (intsid); publicListgetAllStu ();}

JDBC example 4, write your own defined RuntimeException

PublicclassMySQLExceptionextendsRuntimeException {privatestaticfinallongserialVersionUID=1L;}

JDBC example 5, write the implementation class of Studao

PublicclassStuDAOImpleimplementsStudaointer {privateConnectionconn; privatePreparedStatementpre; privateResultSetrs; publicvoidaddStu (Stustu) {Stringsql= "insertintostuvalues ()"; conn=SQLDBConnection.getSQLDBConnection (). GetConnection (); try {pre=conn.prepareStatement (sql); pre.setString (1memstu.getSname ()); pre.setString (2memstu.getSsex ()); pre.setDate (3Min newjava.sql.Date (stu.getSbrith (). GetTime ()); pre.executeUpdate ();} catch (SQLExceptione) {e.printStackTrace (); thrownewMySQLException () / / throw finally {SQLDBConnection.free (rs,pre,conn);}} publicvoiddelStu (intsid) {Stringsql= "deletestuwheres_id=?"; conn=SQLDBConnection.getSQLDBConnection (). GetConnection (); try {pre=conn.prepareStatement (sql); pre.setInt (1 philosophy sid); pre.executeUpdate ();} catch (SQLExceptione) {e.printStackTrace (); thrownewMySQLException ();} finally {SQLDBConnection.free (rs,pre,conn). Is it helpful for you to read the above? If you want to know more about the relevant knowledge or read more related articles, please follow the industry information channel, thank you for your support.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.