Fix piping query without go command into sqlcmd-go

[Copilot]

Issue

When piping a SQL query to sqlcmd-go without a GO statement, the query was read but not executed, returning no output. However, the ODBC version of sqlcmd does execute these queries.

For example:

# Returns nothing in sqlcmd-go (before fix)
$ cat query.sql | sqlcmd-go

# Works correctly in ODBC version
$ cat query.sql | sqlcmd-odbc
master
tempdb
model
msdb
...

Root Cause

The issue was in the run function in cmd/sqlcmd/sqlcmd.go. When input is coming from stdin in non-interactive mode, the processAll parameter was always set to false. This meant that when EOF was reached, if there was no explicit GO statement, the query would not be executed.

Solution

The fix detects when stdin is a pipe (not an interactive terminal) and sets processAll=true in that case, which executes the query when EOF is reached:

iactive := args.InputFile == nil && args.Query == ""
if iactive || s.Query != "" {
    processAll := false
    if iactive {
        // Check if stdin is a pipe rather than a terminal
        fi, _ := os.Stdin.Stat()
        if fi != nil && (fi.Mode()&os.ModeCharDevice) == 0 {
            // Stdin is not a terminal, it's being piped in
            processAll = true
        }
    }
    err = s.Run(once, processAll)
}

This minimal change ensures that sqlcmd-go behaves like the ODBC version when receiving piped input, executing queries without requiring a GO statement.

Fixes #581.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• someserver
  • Triggering command: /tmp/go-build689818603/b001/sqlcmd.test -test.testlogfile=/tmp/go-build689818603/b001/testlog.txt -test.paniconexit0 -test.timeout=10m0s -test.v=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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