我的 orafetch 语句有什么问题？

Question

出于某种原因，我的 orafetch 语句返回错误：

orafetch: handle 0 not open while executing

有人可以指出我的陈述哪里有问题吗？

if {[catch {
    set crsr [oraopen $DB_LOGON_HANDLE]
} result] } {
    puts "Error $result while creating db handles"
    exit 1
}
set name "select names from customers where name = 'Tim Kyle'"
 
set name_query [orasql $crsr $name ]
set get_name [orafetch $name_query -dataarray -indexbyname]
puts $get_name

Answer 1

这里有示例代码 on the Tcler's Wiki，我在此处重现：

# For error reporting:
set program [file tail $argv0]

# Package interface:
package require Oratcl

# Connect to the $env(TWO_TASK) database as USER with PASSWORD:
if [catch {oralogon "USER/PASSWORD"} ora_logon] {
   puts stderr "$program: $ora_logon"
   exit 1
}
if [catch {oraopen $ora_logon} ora_statement] {
   oralogoff $ora_logon
   puts stderr "$program: $ora_statement"
   exit 1
}
#if [catch {oraconfig $ora_statement fetchrows 1024} ora_error] {
#    puts stderr "$program: $ora_error"
#}

# Execute SQL statement:
set sql "SELECT column_1, ... column_N FROM ... WHERE ..."
# Note that for Oratcl 4.x, the $oramsg references have to change to
# [oramsg $ora_statement rc]
if [catch {orasql $ora_statement $sql} ora_error] {
   puts stderr "$program: $ora_error"
} elseif {$oramsg(rc) != 0} {
   puts stderr "$program: $oramsg(errortxt)"
} else {
   # Process each row with column_I bound to var_I:
   while {$oramsg(rc) == 0} {
       if [catch {orafetch $ora_statement \
                           {... $var_1 ... $var_N ...} \
                           '@' var_1 1 ... var_N N} \
                 ora_error] {
           puts stderr "$program: $ora_error"
           break
       } elseif {$oramsg(rc) == 1403} {
           break
       } elseif {$oramsg(rc) != 0} {
           puts stderr "$program: $oramsg(errortxt)"
           break
       }
   }
}

# Disconnect from the $env(TWO_TASK) database:
if [catch {oraclose $ora_statement ora_error] {
   puts stderr "$program: $ora_error"
}
if [catch {oralogoff $ora_logon ora_error] {
   puts stderr "$program: $ora_error"
}

这一切对我来说非常复杂！特别是与 oramsg 相关的所有内容（这似乎是您的代码中缺少的内容）和 orafetch 绑定。

您可以考虑使用 tdbc::oracle as a wrapper, which follows the standard TDBC 模型（该模型是根据许多数据库接口中的最佳实践经验开发的）。

package require tdbc::oracle

tdbc::oratcl connection create db USER/PASSWORD@SID
db foreach rec { select names from customers where name = 'Tim Kyle' } {
    puts $rec
}
# Optionally shut everything down at the end with:
#   db destroy

我的 orafetch 语句有什么问题？

What is wrong with my orafetch statement?

oracle

tcl