Bash，where 条件数组，postgres select

Question

我正在尝试使用 Bash 在我的 postgres 数据库上构建查询。我有一个 asnums 数组，我想在数据库 (ixmaps) 中查询一个 table (dcan_nodup)，以计算这些 asnums 出现的行数。

下面的代码片段有效，下面的代码无效。

WORKS（生成具有预期值的逗号分隔的 csv）：

declare -a carriers=(6461 17025 33139 17899 7018 5730 4466 577 6549 11489)
echo ""
echo "Generating CrFreqTR..."
for asnum in "${carriers[@]}"
do
    echo $asnum
    count=$(psql -d ixmaps -Atc "select count(distinct traceroute_id) from dcan_nodup where asnum = '$asnum';")
    echo $count
    echo $asnum", "$count >> dcan_crfreq_tr.csv
done

不工作：

declare -a whereConditions=('asnum = 6461 or asnum = 17025' 'asnum = 33139' 'asnum = 17899' 'asnum = 7018 or asnum = 5730 or asnum = 4466' 'asnum = 577 or asnum = 6549 or asnum = 11489')
for w in "${whereConditions[@]}"
do
    echo $w

    echo psql -d ixmaps -Atc "select count(distinct traceroute_id) from dcan_nodup where "$w";"
    psql -d ixmaps -Atc "select count(distinct traceroute_id) from dcan_nodup where "$w";"
    echo "NOPE #1"

    count=$(psql -d ixmaps -Atc "select count(distinct traceroute_id) from dcan_nodup where '$w';")
    echo $count
    echo "NOPE #2"
    echo $w", "$count >> dcan_crfreq_tr.csv
done

NOPE #1 结果：

asnum = 6461 or asnum = 17025
psql -d ixmaps -Atc select count(distinct traceroute_id) from dcan_nodup where asnum = 6461 or asnum = 17025;
psql: warning: extra command-line argument "6461" ignored
psql: warning: extra command-line argument "or" ignored
psql: warning: extra command-line argument "asnum" ignored
psql: warning: extra command-line argument "=" ignored
psql: warning: extra command-line argument "17025;" ignored
psql: FATAL:  Ident authentication failed for user "="
NOPE #1
asnum = 33139
psql -d ixmaps -Atc select count(distinct traceroute_id) from dcan_nodup where asnum = 33139;
psql: warning: extra command-line argument "33139;" ignored
psql: FATAL:  Ident authentication failed for user "="
NOPE #1
asnum = 17899
psql -d ixmaps -Atc select count(distinct traceroute_id) from dcan_nodup where asnum = 17899;
psql: warning: extra command-line argument "17899;" ignored
psql: FATAL:  Ident authentication failed for user "="
...

NOPE #2 结果：

asnum = 6461 or asnum = 17025
ERROR:  invalid input syntax for type boolean: "asnum = 6461 or asnum = 17025"
NOPE #2
asnum = 33139
ERROR:  invalid input syntax for type boolean: "asnum = 33139"
...

我想做的是使用 OR 条件来组合 2 个或更多 asns 的计数。如果我手动执行此操作，则效果很好，例如：

ixmaps@trgen:~/scripts$ psql -d ixmaps -Atc "select count(distinct traceroute_id) from dcan_nodup where asnum = 6461 or asnum = 17025;"
124

但我无法让它在 bash 循环中工作...

我怀疑我没有正确转义变量，没有正确连接字符串，或者是一些同样微不足道的事情 - 我是 bash 新手...

Answer 1

您的问题可能是您在展开 $w.

时漏掉了双引号

假设 w='one two'.

比较 printf %s\n "foo "$w" bar" 的输出：

foo one
two bar

到printf %s\n "foo$wbar":

foo one two bar

所以你不想

psql ... "select ... "$w"...;"

相反你想要

psql ... "select ... $w ...;"

Answer 2

像这样？

declare -a carriers=(6461 17025 33139 17899 7018 5730 4466 577 6549 11489)

function join { local IFS=""; shift; echo "$*"; } 

echo ""
echo "Generating CrFreqTR..."

q= "copy ( select asnum count(distinct traceroute_id) from dcan_nodup where asnum in (" \
    `join , "${carriers[@]"` ") group by asnum ) TO STDOUT WITH CSV";

 psql -d ixmaps -Atc "$q" >> dcan_crfreq_tr.csv

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