用Java實現(xiàn)數(shù)據(jù)庫應用系統(tǒng)

2019-11-18 13:39:31

字體：大中小

供稿：網(wǎng)友

　　我們在做信息系統(tǒng)的時候，都要訪問數(shù)據(jù)庫，我最近接手一個項目，項目組決定使用java編寫，我負責數(shù)據(jù)層的設計和編碼，為了提高代碼的重用性和提高項目的開發(fā)效率。我們開發(fā)了一個通用的數(shù)據(jù)庫連接和完成基本操作的類庫，個人認為這個類在做MIS系統(tǒng)時還是有一定的價值，所以總結(jié)出來，介紹給大家。
　　連接工廠，實現(xiàn)了DataSource接口

package skydev.modules.data;
import java.sql.*;
import javax.sql.DataSource;
import java.io.PRintWriter;
public class ConnectionFactory implements DataSource {
private String userName;
private String passWord;
private String driverName;
private String url;
private java.sql.Connection connection;

/**
* 根據(jù)設置的連接參數(shù)創(chuàng)建一個新的連接實例
* @return
*/
private Connection getNewConnection() {
try {
this.connection.close(); //試圖關(guān)閉連接
}
finally {
this.connection = null; //釋放連接
try {
Class.forName(this.driverName); //加載驅(qū)動程序
//DriverManager.registerDriver(driver);
try {
this.connection = DriverManager.getConnection(this.url, this.userName,
this.password);
}
catch (SQLException e) {
throw e;
}
}
finally {
return this.connection; //返回新建立的連接
}
}
}

public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

public String getDriverName() {
return driverName;
}

public void setDriverName(String driverName) {
this.driverName = driverName;
}

public String getUrl() {
return url;
}

public void setUrl(String url) {
this.url = url;
}

public java.sql.Connection getConnection() {
if (connection != null) {
try {
if (connection.isClosed()) {
connection = null;
getNewConnection();
}
}
catch (SQLException ex) {
}
}
if (connection == null) { //沒有設置連接則創(chuàng)建一個連接
getNewConnection();
}
return connection;
}

public Connection getConnection(String userName, String password) throws
SQLException {
this.setUserName(userName);
this.setPassword(password);
return getConnection();
}

public PrintWriter getLogWriter() {
return null;
}

public void setLogWriter(PrintWriter printWriter) {
}

public void setLoginTimeout(int int0) {
}

public int getLoginTimeout() {

上一篇：用Java實現(xiàn)語音引擎

下一篇：用Java實現(xiàn)數(shù)據(jù)庫應用系統(tǒng)（1）