如何获取 SQL 连接的默认模式?

How to get the default schema of a SQL connection?(如何获取 SQL 连接的默认模式?)

问题描述

从 java 代码中 - 我已经连接到数据库 - 我需要找到连接的默认模式.

From within a java code - where I already have a connection to a database - I need to find the default schema of the connection.

我有以下代码，它为我提供了该连接的所有模式的列表.

I have the following code that gives me a list of all schemas of that connection.

rs  = transactionManager.getDataSource().getConnection().getMetaData().getSchemas();
while (rs.next()) {
    log.debug("The schema is {} and the catalogue is {} ", rs.getString(1), rs.getString(2));
}

但是，我不想要所有模式的列表.我需要此连接的默认架构.

However, I don't want the list of all the schemas. I need the default schema of this connection.

请帮忙.

注意 1:我在 Windows7(开发盒)和 Linux Redhat(生产盒)上使用 H2 和 DB2

Note1: I am using H2 and DB2 on Windows7 (dev box) and Linux Redhat (production box)

注2:我最终得出结论，使用Java 中的Connections 对象无法使用相同的代码找到H2 和DB2 的默认模式.我用配置文件解决了这个问题.但是，如果有人可以分享解决方案，我可以回去重构代码.

Note2: I finally concluded that it was not possible to use the Connections object in Java to find the default schema of both H2 and DB2 using the same code. I fixed the problem with a configuration file. However, if someone can share a solution, I could go back and refactor the code.

推荐答案

请使用 connection.getMetaData().getURL() 方法，该方法返回类似字符串的方法

Please use connection.getMetaData().getURL() method which returns String like

jdbc:mysql://localhost:3306/?autoReconnect=true&useUnicode=true&characterEncoding=utf8

我们可以轻松解析它并获取架构名称.它适用于所有 JDBC 驱动程序.

We can parse it easily and get the schema name. It works for all JDBC drivers.

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