CODEWITHSUNDEEP
bashsqlite
user1853170
user1853170

Reputation: 75

How to check whether a sqlite table exist from bash file?

I get two files in the same directory:

foo.db
check.sh

in database foo.db, there is a table called foo.db.1, and in the check.sh, I want to check whether the table exists:

#!/bin/sh
if ![ -e foo.db.1 ]; then
    echo "foo.db.1 does not exist"
    exit 1
fi

then I got an print to say foo.db.1 does not exist. The script seems not working, but if I change the script to check whether the database exist instead of the table exist, it seems work:

#!/bin/sh
if ![ -e foo.db ]; then
    echo "foo.db does not exist"
    exit 1
fi
echo "foo.db does exist"

then I get the print to say 'foo.db does exist'

it seems I can check whether the database exist, but cannot check whether the table exist in the database, and I wonder how to do it?

Upvotes: 0

Views: 2633

Answers (3)

Anurag
Anurag

Reputation: 141919

sqlite3 /database/path "SELECT EXISTS (SELECT * FROM sqlite_master WHERE type='table' AND name='<tableName>');"

will return either a 0 if the table does not exist or a 1 if it exists.

Upvotes: 2

glenn jackman
glenn jackman

Reputation: 247220

You need to use the sqlite3 program to read an sqlite3 db

if sqlite3 ./foo.db <<< .schema | grep -qi 'create table foo.db.1 '; then
    echo "table foo.db.1 exists in foo.db"
fi

Upvotes: 1

konsolebox
konsolebox

Reputation: 75618

Use double brackets or place ! outside:

if [[ ! -e foo.db.1 ]]; then
    echo "foo.db.1 does not exist"
    exit 1
fi

if ! [ -e foo.db.1 ]; then
    echo "foo.db.1 does not exist"
    exit 1
fi

Upvotes: 1

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