TypeHandler | 易学教程

How to map Enum type in mybatis using typeHandler on insert

阅读更多关于 How to map Enum type in mybatis using typeHandler on insert

问题 I have strugled with enum for a while now but it will not go my way. Is there anyone that can give me hint? I am trying to use Enum type in MySql and I also use an Enum class in my code. As the code is now It will insert MONDAY but it will also try to insert MONDAY on workdayID... I do not get the workdayID. I belive I have to handle the DAY_TYPE in som way ... define a typeHandler maybe?? but I tried that and it would not work, or its becouse I can not do it correct? I also tried the org

How do configure the dao files to handle inserting a List<String> in MyBatis

阅读更多关于 How do configure the dao files to handle inserting a List in MyBatis

问题 I have an object that has a variable that's a List like so: ExportQueue.java public class ExportQueue implements Serializable { private List<String> errors; public List<String> getErrors() { return errors; } public void setErrors(List<String> errors) { this.errors = errors; } public void addError(String error) { if(this.errors == null) this.errors = new ArrayList<String>(); this.errors.add(error); } } I've defined the ResultMap for this... ExportQueueDao.xml <mapper namespace="...">

Null Object pattern with a MyBatis TypeHandler

阅读更多关于 Null Object pattern with a MyBatis TypeHandler

问题 I have been trying to make a custom TypeHandler in MyBatis so that for a null column in the database, MyBatis returns an implementation of a Null Object pattern instead of having a null in the domain class. After googling for help, I reached the excelent project mybatis-koans, namely the koan 19 that addresses exactly this issue with the same approach I am using, i.e., extending BaseTypeHandler<T> (is abstract). At this point, I have a concrete TypeHandler similar to the EmailTypeHandler in

MyBatis自定义数据映射TypeHandler

阅读更多关于 MyBatis自定义数据映射TypeHandler

在Mybatis的官方文档中说明了，框架内置的TypeHandler类型。请参见 http://mybatis.github.io/mybatis-3/zh/configuration.html#typeHandlers 同时Mybatis支持自定义typeHandler。例如：自定义了一个将Date存为毫秒时间的VARCHAR类型的TypeHandler package demo; public class CustomTimeStampHandler extends BaseTypeHandler<Date> { @Override public void setNonNullParameter(PreparedStatement ps, int i, Date parameter, JdbcType jdbcType) throws SQLException { ps.setString(i, String.valueOf(parameter.getTime())); } @Override public Date getNullableResult(ResultSet rs, String columnName) throws SQLException { String sqlTimestamp = rs.getString(columnName); if

How to map Enum type in mybatis using typeHandler on insert

阅读更多关于 How to map Enum type in mybatis using typeHandler on insert

I have strugled with enum for a while now but it will not go my way. Is there anyone that can give me hint? I am trying to use Enum type in MySql and I also use an Enum class in my code. As the code is now It will insert MONDAY but it will also try to insert MONDAY on workdayID... I do not get the workdayID. I belive I have to handle the DAY_TYPE in som way ... define a typeHandler maybe?? but I tried that and it would not work, or its becouse I can not do it correct? I also tried the org.apache.ibatis.type.EnumTypeHandler but with no success, like this #{DAY_TYPE,typeHandler=org.apache.ibatis

mybatis自定义枚举转换类

阅读更多关于 mybatis自定义枚举转换类

mybatis提供了EnumTypeHandler和EnumOrdinalTypeHandler完成枚举类型的转换，两者的功能已经基本满足了日常的使用。但是可能有这样的需求：由于某种原因，我们不想使用枚举的name和ordinal作为数据存储字段。mybatis的自定义转换类出现了。前提知识 1. mybatis废弃了ibatis的 TypeHandlerCallback接口，取而代之的接口是 TypeHandler，它与原来的接口略有不同，但是方法类似。（见说明 https://code.google.com/p/mybatis/wiki/DocUpgrade3 ） 2. BaseTypeHandler是mybatis提供的基础转换类，该类实现了TypeHandler接口并提供很多公用方法，建议每个自定义转换类都继承它。示例使用一段代码，将枚举类EnumStatus中的code属性存储到数据库对应字段statusCustom。自定义转换类 package com.sg.util.typehandler; import java.sql.CallableStatement; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import