精尽 MyBatis 源码分析 —— 异常模块_mybatis 异常源码

1.概述

定义了 MyBatis 专有的 PersistenceException 和 TooManyResultsException 异常。

2. exceptions 包

2.1 IbatisException

org.apache.ibatis.exceptions.IbatisException ，实现 RuntimeException 类，IBatis 的异常基类。代码如下：

@Deprecated
public class IbatisException extends RuntimeException {

  private static final long serialVersionUID = 3880206998166270511L;

  public IbatisException() {
    super();
  }

  public IbatisException(String message) {
    super(message);
  }

  public IbatisException(String message, Throwable cause) {
    super(message, cause);
  }

  public IbatisException(Throwable cause) {
    super(cause);
  }

}
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实际上，IbatisException 已经在 2015 年被废弃，取代它的是 PersistenceException 类。

2.2 IbatisException

org.apache.ibatis.exceptions.PersistenceException ，继承 IbatisException 类，目前 MyBatis 真正的异常基类。代码如下：

public class PersistenceException extends IbatisException {

  private static final long serialVersionUID = -7537395265357977271L;

  public PersistenceException() {
    super();
  }

  public PersistenceException(String message) {
    super(message);
  }

  public PersistenceException(String message, Throwable cause) {
    super(message, cause);
  }

  public PersistenceException(Throwable cause) {
    super(cause);
  }
}
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2.3 ExceptionFactory

org.apache.ibatis.exceptions.ExceptionFactory ，异常工厂。代码如下：

public class ExceptionFactory {

  private ExceptionFactory() {
    // Prevent Instantiation
  }

  public static RuntimeException wrapException(String message, Exception e) {
    return new PersistenceException(ErrorContext.instance().message(message).cause(e).toString(), e);
  }

}
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2.4 TooManyResultsException

org.apache.ibatis.exceptions.TooManyResultsException ，继承 PersistenceException 类，查询返回过多结果的异常。期望返回一条，实际返回了多条。代码如下：

public class TooManyResultsException extends PersistenceException {

  private static final long serialVersionUID = 8935197089745865786L;

  public TooManyResultsException() {
    super();
  }

  public TooManyResultsException(String message) {
    super(message);
  }

  public TooManyResultsException(String message, Throwable cause) {
    super(message, cause);
  }

  public TooManyResultsException(Throwable cause) {
    super(cause);
  }
}

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2.5 ParsingException

org.apache.ibatis.parsing.ParsingException ，继承 PersistenceException 类，解析异常。代码如下：

public class ParsingException extends PersistenceException {
  private static final long serialVersionUID = -176685891441325943L;

  public ParsingException() {
    super();
  }

  public ParsingException(String message) {
    super(message);
  }

  public ParsingException(String message, Throwable cause) {
    super(message, cause);
  }

  public ParsingException(Throwable cause) {
    super(cause);
  }
}

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3. 其它包

实际上，我们会看到其他包，会和 parsing 包一样，都会定义其独有的异常类。但是，代码都是相同的。所以，这里就简单整理如下：

reflection 包：ReflectionException
logging 包：LogException
builder 包：BuilderException、IncompleteElementException
scripting 包：ScriptingException
binding 包：BindingException
type 包：TypeException
session 包：SqlSessionException
cache 包：CacheException
transaction 包：TransactionException
datasource 包：DataSourceException
executor 包：ResultMapException、ExecutorException、BatchExecutorException
plugin 包：PluginException