在3.2.8官方文檔中,在'typeHandlers'部分,我有一個測試,然後發現它不能覆蓋默認的org.apache.ibatis.type.StringTypeHandler。我調試它,它停在StringTypeHandler,而不是ExampleTypeHandler。 這裏是MyBatis的-config.xml文件:MyBatis自定義一個typeHandler不執行
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<properties resource="db.properties"/>
<settings>
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<typeAliases>
<package name="com.solverpeng.mybatis.beans"/>
</typeAliases>
<typeHandlers>
<typeHandler handler="com.solverpeng.mybatis.typeHandlers.ExampleTypeHandler"/>
</typeHandlers>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${jdbc.driver}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/solverpeng/mybatis/beans/mapper/CustomerMapper.xml"/>
</mappers>
</configuration>
這裏是ExampleTypeHandler.java
@MappedJdbcTypes(JdbcType.VARCHAR)
public class ExampleTypeHandler extends BaseTypeHandler<String> {
@Override
public void setNonNullParameter(PreparedStatement ps, int i, String parameter, JdbcType jdbcType) throws SQLException {
ps.setString(i, parameter);
}
@Override
public String getNullableResult(ResultSet rs, String columnName) throws SQLException {
return rs.getString(columnName);
}
@Override
public String getNullableResult(ResultSet rs, int columnIndex) throws SQLException {
return rs.getString(columnIndex);
}
@Override
public String getNullableResult(CallableStatement cs, int columnIndex) throws SQLException {
return cs.getString(columnIndex);
}
}