Methods to solve Java database connection exception (DatabaseConnectionException)
In Java development, database connection exception is a very common problem. When we want to connect to a database and perform query or update operations, we may encounter various connection exceptions, the most common of which is DatabaseConnectionException. This abnormality is generally caused by database configuration errors, network connection problems, or database server failures. In this article, I will introduce some methods to solve this exception and provide some code examples to help readers understand better.
The following is a sample code to connect to a MySQL database using Java:
import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DatabaseConnector { private static final String DB_URL = "jdbc:mysql://localhost:3306/mydatabase"; private static final String USER = "root"; private static final String PASSWORD = "password"; public static Connection getConnection() { Connection conn = null; try { conn = DriverManager.getConnection(DB_URL, USER, PASSWORD); } catch (SQLException e) { throw new DatabaseConnectionException("Failed to connect to the database.", e); } return conn; } }
The following is a sample code for connecting to Oracle database using Java:
import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DatabaseConnector { private static final String DB_URL = "jdbc:oracle:thin:@localhost:1521:xe"; private static final String USER = "username"; private static final String PASSWORD = "password"; public static Connection getConnection() { Connection conn = null; try { conn = DriverManager.getConnection(DB_URL, USER, PASSWORD); } catch (SQLException e) { throw new DatabaseConnectionException("Failed to connect to the database.", e); } return conn; } }
Summary:
DatabaseConnectionException exception when connecting to the database is a very common problem, but we can solve this problem by checking the database configuration, network connection and handling database server failure. With the code examples provided in this article, you can better understand and apply these solutions. I hope this article will be helpful in solving Java database connection exceptions.
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