一、背景
笔者碰到利用零碎连贯Oracle数据库时多语言须要对立应用英语,该配置不能在数据库Server端批改,因些须要在利用零碎端想方法进行配置。
二、解决形式
通过查阅数据源和mybatis相干源码,有两种形式反对批改:
1、应用Druid数据源的配置项connectionInitSqls定义连贯初始化语句:
connectionInitSqls: ["ALTER SESSION SET NLS_LANGUAGE='AMERICAN'"]
2、不批改数据源配置,在利用零碎端减少mybatis的拦截器,拦截器代码如下:
(1)、Spring boot的Bean配置
@Configuration
public class MybatisPlusConfig {

/** * 更改会话状态 * * @return */@Beanpublic AlterSessionInterceptor alterSessionInterceptor() {    return new AlterSessionInterceptor();}/** * 乐观锁插件 * * @return */@Beanpublic CustomOptimisticLockerInterceptor optimisticLockerInterceptor() {    return new CustomOptimisticLockerInterceptor();}/** * oracle Sequence主键 * * @return */@Beanpublic OracleKeyGenerator oracleKeyGenerator() {    return new OracleKeyGenerator();}

}

(2)、拦截器代码:
@Slf4j
@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class})})
public class AlterSessionInterceptor implements Interceptor {

@Overridepublic Object intercept(Invocation invocation) throws Throwable {    Object[] args = invocation.getArgs();    Connection connection = (Connection) args[0];    if ("Oracle".equalsIgnoreCase(connection.getMetaData().getDatabaseProductName())) {        Statement statement = null;        try {            statement = connection.createStatement();            String locale = RequestHelper.getCurrentLocale();            if ("en_GB".equalsIgnoreCase(locale)) {                statement.execute("ALTER SESSION SET NLS_LANGUAGE='AMERICAN'");            } else {                statement.execute("ALTER SESSION SET NLS_LANGUAGE='SIMPLIFIED CHINESE'");            }        } finally {            statement.close();        }    }    return invocation.proceed();}@Overridepublic Object plugin(Object target) {    if (target instanceof StatementHandler) {        return Plugin.wrap(target, this);    }    return target;}@Overridepublic void setProperties(Properties properties) {    // to do nothing}

三、计划比照
1、在数据源配置,一次性配置,不必批改代码,所有用户都全副看到的错误信息全部都是英文提醒
2、在代码进行拦挡解决,须要批改代码,可针对不同的用户显示不同语言版本的谬误提醒,然而每次执行语句时,都须要多执行一句设置语言版本语句,操作繁琐,影响性能