java - Why is a simple Hibernate findOne() by primary key taking so long? -


i'm splitting off an earlier question eliminate 'select before save' confusion. in example, i'm trying simple findone() primary key. against existing sqlserver db, latest versions of spring boot , spring data.

i have logging set can see sql hibernate has generated. in example, according logging timing, query takes 4 seconds. querying primary key. when run sql hibernate generated in db tool dbvisualizer, returns in sub-second, expect.

i increased hibernate packaging logging trace level, try see delay is, , found following, before , after 4 second delay:

2017-08-14 09:51:35.345 debug 7532 --- [nio-8085-exec-1] org.hibernate.sql                        : select customer0_.customer_id customer1_4_0_, customer0_.first_name first_na2_4_0_, customer0_.last_name last_nam3_4_0_ xbr_customer_tab customer0_ customer0_.customer_id=? hibernate: select customer0_.customer_id customer1_4_0_, customer0_.first_name first_na2_4_0_, customer0_.last_name last_nam3_4_0_ xbr_customer_tab customer0_ customer0_.customer_id=? 2017-08-14 09:51:35.470 trace 7532 --- [nio-8085-exec-1] o.h.r.j.i.resourceregistrystandardimpl   : registering statement [org.apache.tomcat.jdbc.pool.statementfacade$statementproxy[proxy=25287222; query=select customer0_.customer_id customer1_4_0_, customer0_.first_name first_na2_4_0_, customer0_.last_name last_nam3_4_0_ xbr_customer_tab customer0_ customer0_.customer_id=?; delegate=sqlserverpreparedstatement:6]] 2017-08-14 09:51:35.471 trace 7532 --- [nio-8085-exec-1] o.h.e.jdbc.internal.jdbccoordinatorimpl  : registering last query statement [org.apache.tomcat.jdbc.pool.statementfacade$statementproxy[proxy=25287222; query=select customer0_.customer_id customer1_4_0_, customer0_.first_name first_na2_4_0_, customer0_.last_name last_nam3_4_0_ xbr_customer_tab customer0_ customer0_.customer_id=?; delegate=sqlserverpreparedstatement:6]] 2017-08-14 09:51:35.479 trace 7532 --- [nio-8085-exec-1] o.h.type.descriptor.sql.basicbinder      : binding parameter [1] [varchar] - [40666316] 2017-08-14 09:51:35.488 trace 7532 --- [nio-8085-exec-1] o.h.l.p.e.i.abstractloadplanbasedloader  : bound [2] parameters total 2017-08-14 09:51:39.426 trace 7532 --- [nio-8085-exec-1] o.h.r.j.i.resourceregistrystandardimpl   : registering result set [sqlserverresultset:6] 2017-08-14 09:51:39.434 trace 7532 --- [nio-8085-exec-1] o.h.l.p.e.p.i.resultsetprocessorimpl     : processing result set 2017-08-14 09:51:39.434 debug 7532 --- [nio-8085-exec-1] o.h.l.p.e.p.i.resultsetprocessorimpl     : starting resultset row #0 2017-08-14 09:51:39.436 debug 7532 --- [nio-8085-exec-1] l.p.e.p.i.entityreferenceinitializerimpl : on call entityidentifierreaderimpl#resolve, entitykey known; should happen on root returns optional identifier specified 2017-08-14 09:51:39.436 trace 7532 --- [nio-8085-exec-1] l.p.e.p.i.entityreferenceinitializerimpl : hydrating entity state

i'm wondering why says 2 parameters bound, when there 1 in sql.

any ideas why select taking long? in spring app, , not in client dbvisualizer?

here entity:

import javax.persistence.entity; import javax.persistence.id; import javax.persistence.table;  @entity @table(name = "my_customer_table") public class customer {      @id     private string customer_id;     private string first_name;     private string last_name;      protected customer() {}       public customer(string firstname, string lastname) {         this.first_name = firstname;         this.last_name = lastname;     }  }

here's customerrepository

import com.....customer; import org.springframework.data.repository.crudrepository;  public interface customerrepository extends crudrepository<customer, string> { }

and code customer, @service class customerrepository @autowired in:

customer customer = customerrepository.findone(customerid);

here generated sql:

select customer0_.customer_id customer1_4_0_, customer0_.first_name first_na2_4_0_, customer0_.last_name last_nam3_4_0_ my_customer_table customer0_ customer0_.customer_id=?

fixed adding following parameter connection string in datasource.

sendstringparametersasunicode=false

more detail : http://www.jochenhebbrecht.be/site/2014-05-01/java/fixing-slow-queries-running-sql-server-using-jpa-hibernate-and-jtds


Comments

Post a Comment

Popular posts from this blog

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m...
Read more

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

sql server - Why does Linq-to-SQL add unnecessary COUNT()? -

here tables: create table customer ( cid int primary key, name varchar(32) ) create table ord ( oid int primary key, cid int foreign key references customer, address varchar(20) ) here's linq-to-sql statement: var aaa = c in db.customer select new { c, o = c.ord.tolist() }; and here's inexplicable query generated linq-to-sql: select [t0].[cid] [cid], [t0].[name] [name], [t1].[oid] [oid], [t1].[cid] [cid2], [t1].[address] [address], (select count(*) [dbo].[ord] [t2] [t2].[cid] = [t0].[cid]) [value] [dbo].[customer] [t0] left outer join [dbo].[ord] [t1] on [t1].[cid] = [t0].[cid] order [t0].[cid], [t1].[oid] i want understand how rid of count(*) part. it's entirely uncalled for! linq needs count(*) in order determine number of entries returned o = c.ord.tolist() .
Read more