Oracle + dbunit gets AmbiguousTableNameException

Question

I am using dbunit to create database backups, which can be imported and exported. My application can use several database engines: MySQL, PostgreSQL, SQLServer, H2 and Oracl

Answer 1

You might encounter issues when importing data from Hibernate before DBUnit runs. According to the database you are using, the casing of table and column names could be important.

For example, in HSQL, database names must be declared in uppercase. In case you import data via Hibernate's import.sql, make sure the table names are also in uppercase there, otherwise you'll end up with the following problem:

• Hibernate creates the tables in lower case
• DBUnit reads the table names from the DB in lower case
• DBUnit tries to import its datasets using upper case table names
• You end up in a mess, with the ambiguous name exception.

Remember to also check whether multiple tables were created during a previous run (both upper and lower case), in which case you need to clean it up too.

Answer 2

From the docs:

public class AmbiguousTableNameException extends DataSetException

This exception is thrown by IDataSet when multiple tables having the same name are accessible. This usually occurs when the database connection have access to multiple schemas containing identical table names.

Possible solutions:

1) Use a database connection credential that has access to only one database schema.

2) Specify a schema name to the DatabaseConnection or DatabaseDataSourceConnection constructor.

3) Enable the qualified table name support (see How-to documentation).

Answer 3

For whom uses SpringDBUnit. I had struggled with this very annoying issue. I had ended up solving the issue by adding the configuration for com.github.springtestdbunit.bean.DatabaseConfigBean and com.github.springtestdbunit.bean.DatabaseDataSourceConnectionFactoryBean.

This is my full spring context for SpringDBUnit

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
        destroy-method="close">
        <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@localhost:1521/XE" />
        <property name="username" value="xxxx" />
        <property name="password" value="xxxx" />
    </bean>


    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="dataSource">
            <ref bean="dataSource" />
        </property>
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
        <property name="annotatedClasses">
            <list>
                <value>xxx.example.domain.Person</value>
            </list>
        </property>
    </bean>

    <bean id="dbUnitDatabaseConfig" class="com.github.springtestdbunit.bean.DatabaseConfigBean">
        <property name="skipOracleRecyclebinTables" value="true" />
        <property name="qualifiedTableNames" value="true" />
        <!-- <property name="caseSensitiveTableNames" value="true"/> -->
    </bean>
    <bean id="dbUnitDatabaseConnection"
        class="com.github.springtestdbunit.bean.DatabaseDataSourceConnectionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="databaseConfig" ref="dbUnitDatabaseConfig" />
        <property name="schema" value="<your_schema_name>"/>
    </bean>

Answer 4

Setting the database schema fixed it for me:

@Bean
public DatabaseDataSourceConnectionFactoryBean dbUnitDatabaseConnection(final DataSource dataSource){
    final DatabaseDataSourceConnectionFactoryBean connectionFactory = new DatabaseDataSourceConnectionFactoryBean();
    connectionFactory.setDataSource(dataSource);
    connectionFactory.setSchema(DB_SCHEMA);
    return connectionFactory;
}

Answer 5

I had the same AmbiguousTableNameException while executing Dbunits aginst Oracle DB. It was working fine and started throwing error one day.

Rootcause: while calling a stored procedure, it got modified by mistake to lower case. When changed to upper case it stared working.

I could solve this also by setting the shema name to IDatabaseTester like iDatabaseTester.setSchema("SCHEMANAMEINCAPS")

Also please make sure your connection doesn't access only to many schemas having same table name.