在 H2 中测试 DB2 Timestamp 函数

Question

我正在尝试让单元测试在 H2 中为 DB2 函数 TIMESTAMP(Date, int) 工作，该函数设置时间戳的精度。

一个类似的问题让我 http://www.h2database.com/html/features.html#user_defined_functions 但我不确定在这种情况下重载将如何工作。

谁能举个例子？

（另外，请不要仅仅说使用不同的数据库进行测试和生产是不好的做法。这不是我能够改变的：/）

Answer 1

您好，我有一个带有 VALUE 和 INT 函数的本机查询，我执行了以下步骤：

1) 在自定义函数之前添加

 @Before
public void addCustomFunctions() throws Exception{

    Context context = new InitialContext();
    DataSource dataSource =(DataSource) context.lookup("java:jboss/datasources/ejb3-junit-arguillian-exampleTestDS");

    Connection conn = dataSource.getConnection("sa","sa");
    Statement st = conn.createStatement();
    st.execute("CREATE ALIAS INT FOR \"com.ec.custom.IntFunction.transformInt\"");


}

2) 使用静态公共方法添加类

public class IntFunction {

public static Integer transformInt(Object object) {
    Integer result = 0;
    result = Integer.parseInt(object.toString());
    return result;
}

}

3) 数据源的 jndi 必须存在于

java:jboss/datasources/ejb3-junit-arguillian-exampleTestDS

我的persistence.xml

 <?xml version="1.0" encoding="UTF-8"?>
<!--
    JBoss, Home of Professional Open Source
    Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
    contributors by the @authors tag. See the copyright.txt in the
    distribution for a full listing of individual contributors.
    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
-->
<persistence version="2.0"
             xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="
        http://java.sun.com/xml/ns/persistence
        http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    <persistence-unit name="primary">
        <!-- We use a different datasource for tests, so as to not overwrite
           production data. This is an unmanaged data source, backed by H2, an in memory
           database. Production applications should use a managed datasource. -->
        <!-- The datasource is deployed as WEB-INF/test-ds.xml,
           you can find it in the source at src/test/resources/test-ds.xml -->
        <jta-data-source>java:jboss/datasources/ejb3-junit-arguillian-exampleTestDS</jta-data-source>
        <properties>
            <!-- Properties for Hibernate -->
            <property name="hibernate.hbm2ddl.auto" value="create-drop" />
            <property name="hibernate.show_sql" value="false" />
        </properties>
    </persistence-unit>
</persistence>

您可以按照我使用的 arquillian 的指南进行操作。

https://github.com/monk8800/ejb3-junit-arguillian-example