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BDB_Prog_Reference.pdf
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am.html
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am_close.html
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am_conf.html
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am_conf_logrec.html
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am_conf_select.html
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am_cursor.html
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am_delete.html
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am_foreign.html
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am_get.html
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am_misc.html
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am_misc_bulk.html
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am_misc_db_sql.html
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am_misc_dbsizes.html
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am_misc_diskspace.html
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am_misc_error.html
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am_misc_faq.html
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am_misc_partial.html
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am_misc_perm.html
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am_misc_stability.html
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am_misc_struct.html
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am_misc_tune.html
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am_opensub.html
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am_partition.html
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am_put.html
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am_second.html
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am_stat.html
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am_sync.html
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am_truncate.html
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am_upgrade.html
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am_verify.html
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apprec.html
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apprec_auto.html
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apprec_config.html
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apprec_def.html
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arch.html
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arch_apis.html
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arch_bigpic.gif
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arch_progmodel.html
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arch_script.html
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arch_smallpic.gif
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arch_utilities.html
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bdb_usenix.pdf
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bt_conf.html
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cam.html
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cam_app.html
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cam_fail.html
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ch13s02.html
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csharp.html
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dumpload.html
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dumpload_format.html
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dumpload_text.html
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embedded.html
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env.html
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env_create.html
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env_db_config.html
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env_encrypt.html
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env_error.html
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env_faq.html
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env_naming.html
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env_open.html
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env_region.html
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env_remote.html
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env_security.html
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env_size.html
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ext.html
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ext_perl.html
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ext_php.html
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general_am_conf.html
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gettingStarted.css
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group_membership.html
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hash_conf.html
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hash_usenix.pdf
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heap_conf.html
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index.html
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intro.html
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intro_dbis.html
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intro_dbisnot.html
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intro_distrib.html
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intro_need.html
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intro_products.html
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intro_terrain.html
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intro_what.html
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intro_where.html
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java.html
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java_compat.html
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java_faq.html
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java_program.html
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libtp_usenix.pdf
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lock.html
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lock_am_conv.html
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lock_cam_conv.html
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lock_config.html
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lock_dead.html
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lock_deaddbg.html
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lock_max.html
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lock_nondb.html
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lock_notxn.html
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lock_page.html
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lock_stdmode.html
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lock_timeout.html
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lock_twopl.html
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log.html
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log_config.html
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log_limits.html
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magic.s5.be.txt
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magic.s5.le.txt
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magic.txt
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moreinfo.html
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mp.html
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mp_config.html
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mp_warm.html
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preface.html
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program.html
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program_cache.html
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program_compatible.html
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program_copy.html
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program_environ.html
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program_errorret.html
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program_faq.html
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program_mt.html
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program_namespace.html
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program_perfmon.html
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program_ram.html
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program_runtime.html
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program_scope.html
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refs.html
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rep.html
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rep_app.html
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rep_base_meth.html
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rep_bulk.html
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rep_clock_skew.html
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rep_comm.html
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rep_elect.html
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rep_ex.html
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rep_ex_chan.html
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rep_ex_comm.html
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rep_ex_rq.html
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rep_faq.html
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rep_filename.html
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rep_id.html
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rep_init.html
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rep_lease.html
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rep_mastersync.html
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rep_mgr_ack.html
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rep_mgr_meth.html
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rep_mgrmulti.html
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rep_newsite.html
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rep_partition.html
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rep_pri.html
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rep_replicate.html
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rep_ryw.html
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rep_trans.html
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rep_twosite.html
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repmgr_channels.html
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rq_conf.html
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second.javas
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sequence.html
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solaris.txt
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stl.html
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stl_complex_rw.html
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stl_container_specific.html
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stl_db_advanced_usage.html
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stl_db_usage.html
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stl_efficienct_use.html
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stl_examples.html
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stl_known_issues.html
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stl_memory_mgmt.html
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stl_misc.html
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stl_mt_usage.html
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stl_persistence.html
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stl_primitive_rw.html
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stl_txn_usage.html
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stl_usecase.html
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tcl.html
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tcl_error.html
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tcl_faq.html
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tcl_program.html
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tcl_using.html
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transapp.cs
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transapp.html
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transapp_admin.html
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transapp_app.html
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transapp_archival.html
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transapp_atomicity.html
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transapp_checkpoint.html
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transapp_cursor.html
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transapp_data_open.html
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transapp_deadlock.html
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transapp_env_open.html
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transapp_fail.html
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transapp_faq.html
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transapp_filesys.html
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transapp_hotfail.html
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transapp_inc.html
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transapp_journal.html
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transapp_logfile.html
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transapp_nested.html
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transapp_put.html
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transapp_read.html
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transapp_reclimit.html
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transapp_recovery.html
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transapp_term.html
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transapp_throughput.html
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transapp_tune.html
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transapp_why.html
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txn.html
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txn_config.html
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txn_limits.html
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witold.html
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writetest.cs
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xa.html
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xa_build.html
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xa_faq.html
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xa_xa_config.html
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xa_xa_intro.html
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xa_xa_restrict.html
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Editing: tcl_error.html
<?xml version="1.0" encoding="UTF-8" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <title>Tcl error handling</title> <link rel="stylesheet" href="gettingStarted.css" type="text/css" /> <meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /> <link rel="start" href="index.html" title="Berkeley DB Programmer's Reference Guide" /> <link rel="up" href="tcl.html" title="Chapter 21. Berkeley DB Extensions: Tcl" /> <link rel="prev" href="tcl_program.html" title="Tcl API programming notes" /> <link rel="next" href="tcl_faq.html" title="Tcl FAQ" /> </head> <body> <div xmlns="" class="navheader"> <div class="libver"> <p>Library Version 11.2.5.3</p> </div> <table width="100%" summary="Navigation header"> <tr> <th colspan="3" align="center">Tcl error handling</th> </tr> <tr> <td width="20%" align="left"><a accesskey="p" href="tcl_program.html">Prev</a> </td> <th width="60%" align="center">Chapter 21. Berkeley DB Extensions: Tcl </th> <td width="20%" align="right"> <a accesskey="n" href="tcl_faq.html">Next</a></td> </tr> </table> <hr /> </div> <div class="sect1" lang="en" xml:lang="en"> <div class="titlepage"> <div> <div> <h2 class="title" style="clear: both"><a id="tcl_error"></a>Tcl error handling</h2> </div> </div> </div> <p>The Tcl interfaces to Berkeley DB generally return TCL_OK on success and throw a Tcl error on failure, using the appropriate Tcl interfaces to provide the user with an informative error message. There are some "expected" failures, however, for which no Tcl error will be thrown and for which Tcl commands will return TCL_OK. These failures include times when a searched-for key is not found, a requested key/data pair was previously deleted, or a key/data pair cannot be written because the key already exists.</p> <p>These failures can be detected by searching the Berkeley DB error message that is returned. For example, use the following to detect that an attempt to put a record into the database failed because the key already existed:</p> <pre class="programlisting">% berkdb open -create -btree a.db db0 % db0 put dog cat 0 % set ret [db0 put -nooverwrite dog newcat] DB_KEYEXIST: Key/data pair already exists % if { [string first DB_KEYEXIST $ret] != -1 } { puts "This was an error; the key existed" } This was an error; the key existed % db0 close 0 % exit</pre> <p>To simplify parsing, it is recommended that the initial Berkeley DB error name be checked; for example, <a href="../api_reference/C/dbcput.html#dbcput_DB_KEYEXIST" class="olink">DB_MULTIPLE</a> in the previous example. To ensure that Tcl scripts are not broken by upgrading to new releases of Berkeley DB, these values will not change in future releases of Berkeley DB. There are currently only three such "expected" error returns:</p> <pre class="programlisting">DB_NOTFOUND: No matching key/data pair found DB_KEYEMPTY: Nonexistent key/data pair DB_KEYEXIST: Key/data pair already exists</pre> <p>Finally, sometimes Berkeley DB will output additional error information when a Berkeley DB error occurs. By default, all Berkeley DB error messages will be prefixed with the created command in whose context the error occurred (for example, "env0", "db2", and so on). There are several ways to capture and access this information.</p> <p>First, if Berkeley DB invokes the error callback function, the additional information will be placed in the error result returned from the command and in the errorInfo backtrace variable in Tcl.</p> <p>Also, the two calls to open an environment and open a database take an option, <span class="bold"><strong>-errfile filename</strong></span>, which sets an output file to which these additional error messages should be written.</p> <p>Additionally, the two calls to open an environment and open a database take an option, <span class="bold"><strong>-errpfx string</strong></span>, which sets the error prefix to the given string. This option may be useful in circumstances where a more descriptive prefix is desired or where a constant prefix indicating an error is desired.</p> </div> <div class="navfooter"> <hr /> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"><a accesskey="p" href="tcl_program.html">Prev</a> </td> <td width="20%" align="center"> <a accesskey="u" href="tcl.html">Up</a> </td> <td width="40%" align="right"> <a accesskey="n" href="tcl_faq.html">Next</a></td> </tr> <tr> <td width="40%" align="left" valign="top">Tcl API programming notes </td> <td width="20%" align="center"> <a accesskey="h" href="index.html">Home</a> </td> <td width="40%" align="right" valign="top"> Tcl FAQ</td> </tr> </table> </div> </body> </html>
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