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法律研究如何在整個 Java-MySQL 應用程式中使用一個數據庫連線物件？
使用單例設計模式。以下是返回單個物件的 Java 程式碼 −
ConnectDatabase.java
import java.sql.Connection;
import java.sql.DriverManager;
public class ConnectDatabase {
static Connection conn = null;
public static Connection getConnection() {
if (conn != null) return conn;
String database = "test";
String Username = "root";
String password = "123456";
return getConnection(database, Username, password);
}
private static Connection getConnection(String databaseName, String UserName, String password) {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql:///" + databaseName + "?user=" + UserName + "&password=" + password);
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
}以下是呼叫上述方法的類 −
CallConnection.java
import java.sql.Connection;
public class CallConnection {
public static void main(String[] args) {
Connection con = ConnectDatabase.getConnection();
if (con != null) {
System.out.println("Connection successful !!!");
}
}
} 輸出
上述輸出的內容如下 −
Mon Feb 11 20:15:32 IST 2019 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification. Connection successful !!!
更新於： 2019-07-30
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