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forループを使用したマルチスレッド

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forループを使用したマルチスレッド

これはマルチスレッドを使用したいbashスクリプトコードの一部です。

for DATABASE in $DATABASES ; do
    echo Converting $DATABASE
    # Check if the table is MyISAM (we don't want to convert InnoDB tables over and over again)
    TABLES=$(echo "SELECT TABLE_NAME FROM information_schema.TABLES where TABLE_SCHEMA = '$DATABASE' and ENGINE = 'MyISAM'" | $MYSQL_COMMAND)
    for TABLE in $TABLES ; do
        echo Converting MyISAM $TABLE to InnoDB
        echo "ALTER TABLE $TABLE ENGINE = INNODB" | $MYSQL_COMMAND $DATABASE
    done
    if [ "x$TABLES" = "x" ] ; then
        echo No MyISAM tables found in $DATABASE database
    fi
    echo
done

FORマルチスレッドを使用できますか？

スクリプトを書き直してなどでやろうと思いますがxargs -P3 -n1 -I{}そうです。汚い大きな本。

答え1

私がやった！

function convert_db() {
    echo Converting $1
    # Check if the table is MyISAM (we don't want to convert InnoDB tables over and over again)
    TABLES=$(echo "SELECT TABLE_NAME FROM information_schema.TABLES where TABLE_SCHEMA = '$1' and ENGINE = 'MyISAM'" | $MYSQL_COMMAND)
    for TABLE in $TABLES ; do
        echo Converting MyISAM $TABLE to InnoDB
        echo "ALTER TABLE $TABLE ENGINE = INNODB" | $MYSQL_COMMAND $1
    done
    if [ "x$TABLES" = "x" ] ; then
        echo No MyISAM tables found in $1 database
    fi
    echo
}

for DATABASE in $DATABASES ; do
convert_db $DATABASE &
done

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