How to solve Java database write exception (DatabaseWriteException)

How to solve Java database write exception (DatabaseWriteException)

In the process of developing Java applications, database write exceptions are often encountered. This anomaly is usually caused by data source configuration errors, network interruptions, or database failures. This article will introduce some methods to solve Java database write exceptions and provide code examples.

1. Check data source configuration
   First, we need to check whether the database connection configuration is correct. Make sure that the database URL, username, password, etc. are correct and that the database driver is loaded correctly. Below is a sample code snippet that shows the basics of how to set up a data source.

import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSource;

public class DatabaseUtil {
  private static DataSource dataSource;

  public static DataSource getDataSource() {
    if (dataSource == null) {
      BasicDataSource basicDataSource = new BasicDataSource();
      basicDataSource.setDriverClassName("com.mysql.jdbc.Driver");
      basicDataSource.setUrl("jdbc:mysql://localhost:3306/mydatabase");
      basicDataSource.setUsername("root");
      basicDataSource.setPassword("password");
      dataSource = basicDataSource;
    }
    return dataSource;
  }
}

2. Handling connection exceptions
   When the database connection is unavailable, we need to handle the connection exception and retry the connection appropriately. The following is a sample code snippet that shows how to detect whether a database connection is available and retry the connection.

import java.sql.Connection;
import java.sql.SQLException;

public class DatabaseWriter {
  public void writeData(String data) {
    Connection connection = null;
    try {
      connection = DatabaseUtil.getDataSource().getConnection();
      // 执行数据库写入操作
    } catch (SQLException e) {
      // 处理连接异常
      handleConnectionException();
    } finally {
      closeConnection(connection);
    }
  }

  private void handleConnectionException() {
    // 处理连接异常的逻辑，例如等待一段时间后重试连接
  }

  private void closeConnection(Connection connection) {
    if (connection != null) {
      try {
        connection.close();
      } catch (SQLException e) {
        // 处理连接关闭异常
      }
    }
  }
}

3. Handling write exceptions
   When performing a database write operation, you may encounter write exceptions, such as primary key conflicts or field constraint errors. We need to handle these exceptions based on specific exception information. The following is a sample code snippet that shows how to handle write exceptions.

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DatabaseWriter {
  public void writeData(String data) {
    Connection connection = null;
    try {
      connection = DatabaseUtil.getDataSource().getConnection();
      PreparedStatement preparedStatement = connection.prepareStatement("INSERT INTO mytable (column1) VALUES (?)");
      preparedStatement.setString(1, data);
      preparedStatement.executeUpdate();
    } catch (SQLException e) {
      // 处理写入异常
      handleWriteException(e);
    } finally {
      closeConnection(connection);
    }
  }

  private void handleWriteException(SQLException e) {
    // 根据具体的异常信息来处理写入异常
  }

  // 省略其他方法
}

Summary:
When developing Java applications, resolving database write exceptions is a common task. By checking the data source configuration, handling connection exceptions and write exceptions, we can effectively resolve these exceptions. I hope the sample code provided in this article can help you better handle Java database write exceptions.

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