Bash中使用MySQL导入导出CSV格式数据

二 12th, 2011 | Filed under Linux相关, 数据库技术

MySQL中导出CSV格式数据的SQL语句样本如下:
Sql代码
select * from test_info
into outfile ‘/tmp/test.csv’
fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘
lines terminated by ‘\r\n’;
MySQL中导入CSV格式数据的SQL语句样本如下:
Sql代码
load data infile ‘/tmp/test.csv’
into table test_info
fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘
lines terminated by ‘\r\n’;
里面最关键的部分就是格式参数
Sql代码
fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘
lines terminated by ‘\r\n’
这个参数是根据RFC4180文档设置的,该文档全称Common Format and MIME Type for Comma-Separated Values (CSV) Files,其中详细描述了CSV格式,其要点包括:
(1)字段之间以逗号分隔,数据行之间以\r\n分隔;
(2)字符串以半角双引号包围,字符串本身的双引号用两个双引号表示。

文件:test_csv.sql
Sql代码
use test;

create table test_info (
id integer not null,
content varchar(64) not null,
primary key (id)
);

delete from test_info;

insert into test_info values (2010, ‘hello, line
suped
seped

end’
);

select * from test_info;

select * from test_info into outfile ‘/tmp/test.csv’ fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘ lines terminated by ‘\r\n’;

delete from test_info;

load data infile ‘/tmp/test.csv’ into table test_info fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘ lines terminated by ‘\r\n’;

select * from test_info;

文件:test.csv
Text代码
2010,”hello, line
suped
seped
“”
end”

在Linux下如果经常要进行这样的导入导出操作,当然最好与Shell脚本结合起来,为了避免每次都要写格式参数,可以把这个串保存在变量中,如下所示:(文件mysql.sh)
Bash代码
#!/bin/sh

# Copyright (c) 2010 codingstandards. All rights reserved.
# file: mysql.sh
# description: Bash中操作MySQL数据库
# license: LGPL
# author: codingstandards
# email: codingstandards@gmail.com
# version: 1.0
# date: 2010.02.28

# MySQL中导入导出数据时,使用CSV格式时的命令行参数
# 在导出数据时使用:select … from … [where ...] into outfile ‘/tmp/data.csv’ $MYSQL_CSV_FORMAT;
# 在导入数据时使用:load data infile ‘/tmp/data.csv’ into table … $MYSQL_CSV_FORMAT;
# CSV标准文档:RFC 4180
MYSQL_CSV_FORMAT=”fields terminated by ‘,’ optionally enclosed by ‘\”‘ escaped by ‘\”‘ lines terminated by ‘\r\n’”

使用示例如下:(文件test_mysql_csv.sh)
Bash代码
#!/bin/sh

. /opt/shtools/commons/mysql.sh

# MYSQL_CSV_FORMAT=”fields terminated by ‘,’ optionally enclosed by ‘\”‘ escaped by ‘\”‘ lines terminated by ‘\r\n’”
echo “MYSQL_CSV_FORMAT=$MYSQL_CSV_FORMAT”

rm /tmp/test.csv

mysql -p –default-character-set=gbk -t –verbose test <

use test;

create table if not exists test_info (
id integer not null,
content varchar(64) not null,
primary key (id)
);

delete from test_info;

insert into test_info values (2010, ‘hello, line
suped
seped

end’
);

select * from test_info;

– select * from test_info into outfile ‘/tmp/test.csv’ fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘ lines terminated by ‘\r\n’;
select * from test_info into outfile ‘/tmp/test.csv’ $MYSQL_CSV_FORMAT;

delete from test_info;

– load data infile ‘/tmp/test.csv’ into table test_info fields terminated by ‘,’ optionally enclosed by ‘”‘ escaped by ‘”‘ lines terminated by ‘\r\n’;
load data infile ‘/tmp/test.csv’ into table test_info $MYSQL_CSV_FORMAT;

select * from test_info;

EOF

echo “===== content in /tmp/test.csv =====”
cat /tmp/test.csv

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