[英]Get the query plan using jdbc PreparedStatement on sql server
使用Statment,resultSet.getObject將查詢計划返回為xml
Connection conn = getConnection();
String query = " SET SHOWPLAN_XML on ";
Statement st = conn.createStatement();
boolean execute=st.execute(query);
log.info("execute status {} " , execute);
query = " SELECT ATMPROFILES.TERMID as COLUMNID, ATMPROFILES.TERMID as COLUMNNAME FROM ATMPROFILES (NOLOCK) "
+ " WHERE Authprocessname = 'ATMST' "
+ "ORDER BY ATMPROFILES.TERMID ";
ResultSet rs = st.executeQuery(query);
while(rs.next())
{
Object object = rs.getObject(1);
log.info("Query Plan {} ", object);
}
但是,如果我通過PreparedStatement執行相同的操作,它將返回實際結果,而不是QueryPlan
Connection conn = getConnection();
String query = " SET SHOWPLAN_XML on ";
PreparedStatement ps = conn.prepareStatement(query);
boolean execute = ps.execute();
log.info("execute status {} " , execute);
query = " SELECT ATMPROFILES.TERMID as COLUMNID, ATMPROFILES.TERMID as COLUMNNAME FROM ATMPROFILES (NOLOCK) "
+ " WHERE Authprocessname = 'ATMST' "
+ "ORDER BY ATMPROFILES.TERMID ";
ps=conn.prepareStatement(query);
execute=ps.execute();
log.info("execute status {} " , execute);
ResultSet rs = ps.getResultSet();
while(rs.next())
{
Object object = rs.getObject(1);
// here it returns selected object
log.info("Query Plan {} ", object);
}
任何通過PreparedStatement實現此目的的想法。
我還沒有找到任何參考,為什么將SET SHOWPLAN_XML ON
作為已准備好的語句執行將不起作用。 但是,當您直接運行此語句並將實際查詢作為准備好的語句運行時,應該會獲得所需的結果。 在代碼中:
Connection conn = getConnection();
String showplanQuery = "SET SHOWPLAN_XML ON";
Statement st = conn.createStatement();
st.execute(showplanQuery);
String actualQuery = "SELECT ATMPROFILES.TERMID FROM ATMPROFILES (NOLOCK) ";
PreparedStatement ps=conn.prepareStatement(actualQuery);
ps.execute();
ResultSet rs = ps.getResultSet();
while(rs.next())
{
Object object = rs.getObject(1);
// should log the query plan
log.info("Query Plan {} ", object);
}
希望能有所幫助。
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