SelectMethod=cursor
1.执行多个Statements的操作的时候用
2.需要手动使用事务的时候使用
以上是在使用sqlserver数据库的连接字符串的时候使用过。
例如:jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=071008_03;SelectMethod=cursor
用SQL Server驱动一次select很多数据最好在connection string中加上SelectMethod=Cursor,以利用服务器端游标加快速度,其实不只sqlserver,oracle的jdbc,只要使用PreparedStatement,驱动默认就使用游标,sqlserver则不然,必须使用SelectMethod=Cursor才打开游标。
这点在使用jotm时,并且使用Xapool时,必须修改DataSourceFactory,把PreparedStatementPool禁掉,否则记录插的太快了,很可能是游标没来得及关闭
即使不使用jotm,大量向oracle插入数据,例如每毫秒1条,也会引发游标用完,所以大量插入数据时,应该使用oracle的批处理batchupdate.
可惜的是,微软的sqlserver的jdbc驱动不支持这个属性
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