package Factoryproduct;import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement;interface DBlink {//數據庫連接方法public Connection Link(); }//SQLserver數據庫連接class SQLServer implements DBlink{Statement stat=null;Connection conn=null;public Connection Link(){try {Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {conn = DriverManager.getConnection("jdbc:sqlserver://localhost:1433;DatabaseName=master","root","123456");} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {stat =conn.createStatement();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}}//mysql數據庫連接class MySql implements DBlink{Statement stat=null;Connection conn=null;public Connection Link() {try {Class.forName("com.mysql.jdbc.Driver");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/employees?characterEncoding=utf8","root","123456");} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {stat =conn.createStatement();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}}//Oracle數據庫連接class OraCle implements DBlink{Statement stat=null;Connection conn=null;public Connection Link() {try {Class.forName("oracle.jdbc.driver.OracleDriver");} catch (ClassNotFoundException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:employees?characterEncoding=utf8","root","123456");} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}try {stat =conn.createStatement();} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return conn;}} //testclass DBlinkFactory{public static Connection Return(String linkkind){if(linkkind=="SQLserver")return new SQLServer().Link();if(linkkind=="Oracle")return new OraCle().Link();if(linkkind=="Mysql")return new MySql().Link();return null;}}

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