从bash中读取mysql数据库

创建数据库及数据表的脚本如下：

[root@iZr4s05capgvfej0ntls1zZ ~]# cat create_db.sh
#!/bin/bash
#文件名：create_db.sh
#用途：创建MysqL数据库

USER="user"
PASS="user"

MysqL -u $USER -p$PASS <<EOF 2> /dev/null
CREATE DATABASES students;
EOF

[ $? -eq 0 ] && echo Created DB || echo DB already exist
MysqL -u $USER -p$PASS studente <<EOF 2> /dev/null
CREATE TABLE students(
id int,
name varchar(100),
mark int,
dept varchar(4)
);
EOF

[ $?  -eq 0 ] && echo Created table students || echo Table students already exist

MysqL -u $USER -P$PASS students <<EOF
DELETE FROM students;
EOF

 

将数据插入数据表的脚本如下：

[root@iZr4s05capgvfej0ntls1zZ ~]# cat write_to_db.sh
#!/bin/bash
#文件名：write_to_db.sh
#用途：从csv中读取数据并写入MysqLdb


USER="user"
PASS="user"

if [$# -ne 1 ];
then
  echo $0 DATAFILE
  echo
  exit 2
fi

data=$1

while read line;
do
  oldIFS=$IFS
  IFS=,
  values=($line)
  values[1]="\"`echo ${values[1]} |tr ' ' '#' `\""
  values[3]="\"`echo ${values[3]}`\""

  query=`echo ${values[@]} | tr ' #' ', '`
  IFS=$oldIFS

  MysqL -u $USER -P$PASS students <<EOF
INSERT INFO STUDENTS values($query)
EOF

done< $data
echo Wrote data into DB

 

 

查询数据库的脚本如下：

[root@iZr4s05capgvfej0ntls1zZ ~]# cat read_db.sh
#!/bin/bash
#文件名：read_db.sh
#用途：从数据库中读取数据

USER="user"
PASS="user"

depts=`MysqL -u $USER -p$PASS students <<EOF | tail -n +2
SELECT disTINCT dept FROM students;
EOF`

for d in $depts;
do

echo Department : $d

result="`MysqL -u $USER -p$PASS students <<EOF
SET @I:=0;
SELECT @I:@I+1 as rank,name,mark FROM students WHERE dept="$d" ORDER BY mark DESC;
EOF`"

echo "$result"
echo

done