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mybatis使用jdbc连接sqlserver数据时，抛出如下异常。
异常的大概意思：目前使用的驱动程序不支持SQLServer版本8
查看了引入的jar包是这个"mssql-jdbc.jar"所以才导致异常的出现，之后换成"sqljdbc4.jar" 就解决了
注意：sqljdbc4.jar 必须要在jdk1.6以上的版本才能使用，sqljdbc4.jar 点击下载
2018-07-11 11:34:13,164 [main] ERROR [com.alibaba.druid.pool.DruidDataSource] - dataSource init error
com.microsoft.sqlserver.jdbc.SQLServerException: SQL Server version 8 is not supported by this driver. ClientConnectionId:5ca1a960-9c4a-4d2e-8419-6a47829a4f7c
at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(SQLServerConnection.java:2392)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.terminate(SQLServerConnection.java:2376)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.Prelogin(SQLServerConnection.java:2261)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1965)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:1616)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectInternal(SQLServerConnection.java:1447)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:788)
at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1187)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:148)
at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:785)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:785)
at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:785)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:211)
at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1388)
at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1442)
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:632)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)