SELECT into outfile 备份数据库数据

select email into outfile "test.txt" from email;


select substring(boss,0,2),addr from guest;


LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL]  INFILE “/opt/abc.txt" INTO TABLE table_name


FIELDS TERMINATED BY ',' (column1, column2,colum3);


mysql> SELECT * FROM table1 INTO OUTFILE 'data.txt'
FIELDS TERMINATED BY ','
FROM ...


为了将由逗号分隔的文件读回来，正确的语句将是：


mysql> LOAD DATA INFILE 'data.txt' INTO TABLE table2
FIELDS TERMINATED BY ',';


相反，如果你试图用下面显示的语句读取文件，它不会工作，因为它命令LOAD DATA INFILE在字段之间


寻找定位符：


mysql> LOAD DATA INFILE 'data.txt' INTO TABLE table2
FIELDS TERMINATED BY '\t';


可能的结果是每个输入行将被解释为单个的字段。


LOAD DATA INFILE能被用来读取从外部来源获得的文件。例如，以dBASE格式的文件将有由逗号分隔并用


双引号包围的字段。如果文件中的行由换行符终止，下面显示的命令说明你将用来装载文件的字段和行


处理选项：


mysql> LOAD DATA INFILE 'data.txt' INTO TABLE tbl_name
FIELDS TERMINATED BY ',' ENCLOSED BY '"'
LINES TERMINATED BY '\n';


任何字段或行处理选项可以指定一个空字符串('')。如果不是空，FIELDS [OPTIONALLY] ENCLOSED BY和


FIELDS ESCAPED BY值必须是一个单个字符。FIELDS TERMINATED BY和LINES TERMINATED BY值可以是超


过一个字符。例如，写入由回车换行符对（CR+LF）终止的行，或读取包含这样行的一个文件，指定一个


LINES TERMINATED BY '\r \n'子句。


FIELDS [OPTIONALLY] ENCLOSED BY控制字段的包围字符。对于输出 (SELECT ... INTO OUTFILE)，如果


你省略OPTIONALLY，所有的字段由ENCLOSED BY字符包围。对于这样的输出的一个例子(使用一个逗号作


为字段分隔符)显示在下面：


"1","a string","100.20"
"2","a string containing a , comma","102.20"
"3","a string containing a \" quote","102.20"
"4","a string containing a \", quote and comma","102.20"


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insert into tabl(id,email) select id, email from guest;