Solution to solve Java database update exception (DatabaseUpdateException)
Solution to Java database update exception (DatabaseUpdateException)
When using Java programming language for database operations, we often encounter database update exception (DatabaseUpdateException) . This kind of exception is usually caused by improper data operation, database connection exception or SQL statement error. This article will introduce some common solutions to handle these exceptions, with corresponding code examples.
1. Check the database connection
Before performing database operations, first ensure that the database connection is normal. If there is a problem with the database connection, an exception will be thrown when executing the SQL statement. You can check whether the database connection is normal by writing a simple method:
public class DatabaseUtil { // ... public static Connection getConnection() { Connection conn = null; try { // 获取数据库连接代码 } catch (SQLException e) { e.printStackTrace(); } return conn; } public static boolean isConnectionValid(Connection conn) { try { return conn.isValid(5000); // 设置超时时间为5秒 } catch (SQLException e) { e.printStackTrace(); } return false; } }
Before performing database operations, you can call the isConnectionValid
method to check whether the database connection is valid.
2. Check the SQL statement
Before executing the SQL statement, be sure to carefully check the correctness of the SQL statement. Common SQL statement errors include syntax errors, table name errors, field name errors, etc. You can check the correctness of the SQL statement by printing it or using database debugging tools.
public class DatabaseUtil { // ... public static void insertData(String name, int age) throws SQLException { Connection conn = null; Statement stmt = null; try { conn = getConnection(); stmt = conn.createStatement(); String sql = "INSERT INTO user (name, age) VALUES ('" + name + "', " + age + ")"; stmt.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); throw e; } finally { // 释放资源的代码 } } }
When performing the data insertion operation, you can first print the SQL statement to see if it meets expectations.
3. Handling exceptions
If an exception is thrown during the database update operation, corresponding exception handling should be performed. You can choose to capture and record exceptions, roll back transactions, or close database connections based on specific circumstances.
public class DatabaseUtil { // ... public static void updateData(int id, String name) { Connection conn = null; Statement stmt = null; try { conn = getConnection(); stmt = conn.createStatement(); String sql = "UPDATE user SET name='" + name + "' WHERE id=" + id; stmt.executeUpdate(sql); } catch (SQLException e) { e.printStackTrace(); // 异常处理代码 } finally { // 释放资源的代码 } } }
When updating data, if an exception occurs, corresponding processing can be carried out according to the actual situation, such as logging or rolling back the transaction.
4. Use transactions
When performing database operations, you can use transactions to ensure the atomicity of a set of operations. Transactions can guarantee that multiple database operations either all succeed or all fail. You can use the corresponding transaction management class to complete transaction control.
public class DatabaseUtil { // ... public static void updateDataWithTransaction(int id, String name) throws SQLException { Connection conn = null; Statement stmt = null; try { conn = getConnection(); conn.setAutoCommit(false); stmt = conn.createStatement(); String sql = "UPDATE user SET name='" + name + "' WHERE id=" + id; stmt.executeUpdate(sql); // 其他数据库操作代码 conn.commit(); } catch (SQLException e) { e.printStackTrace(); conn.rollback(); throw e; } finally { // 释放资源的代码 conn.setAutoCommit(true); } } }
When using transactions, you need to call the setAutoCommit(false)
method in the appropriate place to set the automatic commit of the transaction to false
, and call it after the transaction execution is completed commit()
method commits the transaction. If an exception occurs, you can call the rollback()
method to roll back the transaction and continue to throw the exception upward.
In summary, solving Java database update exceptions requires us to carefully check the database connection, SQL statements and perform appropriate exception handling. Reasonable use of transactions can ensure the atomicity of database operations. Through the above solutions and code examples, we hope to help readers better handle database update exceptions.
The above is the detailed content of Solution to solve Java database update exception (DatabaseUpdateException). For more information, please follow other related articles on the PHP Chinese website!

在使用Netty开发WebSocket服务器时,可能会遇到浏览器在尝试连接时未能正确处理服务器返回的401状态码的情况。 �...

Java compilation failed: Running window javac command cannot generate class file Many Java beginners will encounter this problem during the learning process: running window...

Discussing the hierarchical architecture problem in back-end development. In back-end development, common hierarchical architectures include controller, service and dao...

Packages and Directories in Java: The logic behind compiler errors In Java development, you often encounter problems with packages and directories. This article will explore Java in depth...

Leetcode ...

JWT and Session Choice: Tradeoffs under Dynamic Permission Changes Many Beginners on JWT and Session...

How to correctly configure apple-app-site-association file in Baota nginx? Recently, the company's iOS department sent an apple-app-site-association file and...

How to understand the classification and implementation methods of two consistency consensus algorithms? At the protocol level, there has been no new members in the selection of consistency algorithms for many years. ...


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 English version
Recommended: Win version, supports code prompts!

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.