MySQL的文本导入之loaddatalocal

数据文件格式：

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Aeschylus time as he grows old teaches many lessons

Alexander Graham Bell Mr.Watson,come here.i want you!

Benjamin Franklin it is hard for an empty bag to stand upright

Benjamin Franklin little strokes fell great oaks

--字段之间是tab，其它是空格

导入命令：

drop table aa;

create table aa(a varchar(40),tt text);

load data local infile 'a.txt' into table aa;

select * from aa;

过程：

root@localhost[lhrdb]> drop table aa;

Query OK, 0 rows affected (0.17 sec)

root@localhost[lhrdb]> create table aa(a varchar(40),tt text);

Query OK, 0 rows affected (0.30 sec)

root@localhost[lhrdb]> load data local infile 'a.txt' into table aa;

Query OK, 4 rows affected (0.07 sec)

Records: 4 Deleted: 0 Skipped: 0 Warnings: 0

root@localhost[lhrdb]> select * from aa;

+-----------------------+----------------------------------------------+

| a                     | tt                                           |

+-----------------------+----------------------------------------------+

| Aeschylus | time as he grows old teaches many lessons |

| Alexander Graham Bell | Mr.Watson,come here.i want you! |

| Benjamin Franklin | it is hard for an empty bag to stand upright |

| Benjamin Franklin | little strokes fell great oaks |

+-----------------------+----------------------------------------------+

4 rows in set (0.00 sec)

帮助：

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root@localhost[lhrdb]> help load data

Name: 'LOAD DATA'

Description:

Syntax:

LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE 'file_name'

[REPLACE | IGNORE]

INTO TABLE tbl_name

[PARTITION (partition_name,...)]

[CHARACTER SET charset_name]

[{FIELDS | COLUMNS}

[TERMINATED BY 'string']

[[OPTIONALLY] ENCLOSED BY 'char']

[ESCAPED BY 'char']

]

[LINES

[STARTING BY 'string']

[TERMINATED BY 'string']

]

[IGNORE number {LINES | ROWS}]

[(col_name_or_user_var,...)]

[SET col_name = expr,...]

The LOAD DATA INFILE statement reads rows from a text file into a table

at a very high speed. LOAD DATA INFILE is the complement of SELECT ...

INTO OUTFILE. (See

http://dev.MySQL.com/doc/refman/5.7/en/select-into.html.) To write data

from a table to a file, use SELECT ... INTO OUTFILE. To read the file

back into a table, use LOAD DATA INFILE. The syntax of the FIELDS and

LINES clauses is the same for both statements. Both clauses are

optional, but FIELDS must precede LINES if both are specified.

You can also load data files by using the mysqlimport utility; it

operates by sending a LOAD DATA INFILE statement to the server. The

--local option causes mysqlimport to read data files from the client

host. You can specify the --compress option to get better performance

over slow networks if the client and server support the compressed

protocol. See http://dev.mysql.com/doc/refman/5.7/en/mysqlimport.html.

For more information about the efficiency of INSERT versus LOAD DATA

INFILE and speeding up LOAD DATA INFILE, see

http://dev.mysql.com/doc/refman/5.7/en/insert-optimization.html.

The file name must be given as a literal string. On Windows, specify

backslashes in path names as forward slashes or doubled backslashes.

The character_set_filesystem system variable controls the

interpretation of the file name.

LOAD DATA supports explicit partition selection using the PARTITION

option with a comma-separated list of one or more names of partitions,

subpartitions, or both. When this option is used, if any rows from the

file cannot be inserted into any of the partitions or subpartitions

named in the list, the statement fails with the error Found a row not

matching the given partition set. For more information, see

http://dev.mysql.com/doc/refman/5.7/en/partitioning-selection.html.

For partitioned tables using storage engines that employ table locks,

such as MyISAM, LOAD DATA cannot prune any partition locks. This does

not apply to tables using storage engines which employ row-level

locking, such as InnoDB. For more information, see

http://dev.mysql.com/doc/refman/5.7/en/partitioning-limitations-locking

.html.

The server uses the character set indicated by the

character_set_database system variable to interpret the information in

the file. SET NAMES and the setting of character_set_client do not

affect interpretation of input. If the contents of the input file use a

character set that differs from the default, it is usually preferable

to specify the character set of the file by using the CHARACTER SET

clause. A character set of binary specifies "no conversion."

LOAD DATA INFILE interprets all fields in the file as having the same

character set, regardless of the data types of the columns into which

field values are loaded. For proper interpretation of file contents,

you must ensure that it was written with the correct character set. For

example, if you write a data file with mysqldump -T or by issuing a

SELECT ... INTO OUTFILE statement in mysql, be sure to use a

--default-character-set option so that output is written in the

character set to be used when the file is loaded with LOAD DATA INFILE.

*Note*:

It is not possible to load data files that use the ucs2, utf16,

utf16le, or utf32 character set.

If you use LOW_PRIORITY, execution of the LOAD DATA statement is

delayed until no other clients are reading from the table. This affects

only storage engines that use only table-level locking (such as MyISAM,

MEMORY, and MERGE).

If you specify CONCURRENT with a MyISAM table that satisfies the

condition for concurrent inserts (that is, it contains no free blocks

in the middle), other threads can retrieve data from the table while

LOAD DATA is executing. This option affects the performance of LOAD

DATA a bit, even if no other thread is using the table at the same

time.

With row-based replication, CONCURRENT is replicated regardless of

MySQL version. With statement-based replication CONCURRENT is not

replicated prior to MySQL 5.5.1 (see Bug #34628). For more information,

see

http://dev.mysql.com/doc/refman/5.7/en/replication-features-load-data.h

tml.

The LOCAL keyword affects expected location of the file and error

handling, as described later. LOCAL works only if your server and your

client both have been configured to permit it. For example, if mysqld

was started with the local_infile system variable disabled, LOCAL does

not work. See

http://dev.mysql.com/doc/refman/5.7/en/load-data-local.html.

The LOCAL keyword affects where the file is expected to be found:

o If LOCAL is specified, the file is read by the client program on the

client host and sent to the server. The file can be given as a full

path name to specify its exact location. If given as a relative path

name, the name is interpreted relative to the directory in which the

client program was started.

When using LOCAL with LOAD DATA, a copy of the file is created in the

server's temporary directory. This is not the directory determined by

the value of tmpdir or slave_load_tmpdir, but rather the operating

system's temporary directory, and is not configurable in the MySQL

Server. (Typically the system temporary directory is /tmp on Linux

systems and C:\WINDOWS\TEMP on Windows.) Lack of sufficient space for

the copy in this directory can cause the LOAD DATA LOCAL statement to

fail.

o If LOCAL is not specified, the file must be located on the server

host and is read directly by the server. The server uses the

following rules to locate the file:

o If the file name is an absolute path name, the server uses it as

given.

o If the file name is a relative path name with one or more leading

components, the server searches for the file relative to the

server's data directory.

o If a file name with no leading components is given, the server

looks for the file in the database directory of the default

database.

In the non-LOCAL case, these rules mean that a file named as

./myfile.txt is read from the server's data directory, whereas the file

named as myfile.txt is read from the database directory of the default

database. For example, if db1 is the default database, the following

LOAD DATA statement reads the file data.txt from the database directory

for db1, even though the statement explicitly loads the file into a

table in the db2 database:

LOAD DATA INFILE 'data.txt' INTO TABLE db2.my_table;

Non-LOCAL load operations read text files located on the server. For

security reasons, such operations require that you have the FILE

privilege. See

http://dev.mysql.com/doc/refman/5.7/en/privileges-provided.html. Also,

non-LOCAL load operations are subject to the secure_file_priv system

variable setting. If the variable value is a nonempty directory name,

the file to be loaded must be located in that directory. If the

variable value is empty (which is insecure), the file need only be

readable by the server.

Using LOCAL is a bit slower than letting the server access the files

directly, because the contents of the file must be sent over the

connection by the client to the server. On the other hand, you do not

need the FILE privilege to load local files.

LOCAL also affects error handling:

o With LOAD DATA INFILE, data-interpretation and duplicate-key errors

terminate the operation.

o With LOAD DATA LOCAL INFILE, data-interpretation and duplicate-key

errors become warnings and the operation continues because the server

has no way to stop transmission of the file in the middle of the

operation. For duplicate-key errors, this is the same as if IGNORE is

specified. IGNORE is explained further later in this section.

The REPLACE and IGNORE keywords control handling of input rows that

duplicate existing rows on unique key values:

o If you specify REPLACE, input rows replace existing rows. In other

words, rows that have the same value for a primary key or unique

index as an existing row. See [HELP REPLACE].

o If you specify IGNORE, rows that duplicate an existing row on a

unique key value are discarded. For more information, see

http://dev.mysql.com/doc/refman/5.7/en/sql-mode.html#ignore-strict-co

mparison.

o If you do not specify either option, the behavior depends on whether

the LOCAL keyword is specified. Without LOCAL, an error occurs when a

duplicate key value is found, and the rest of the text file is

ignored. With LOCAL, the default behavior is the same as if IGNORE is

specified; this is because the server has no way to stop transmission

of the file in the middle of the operation.

URL: http://dev.mysql.com/doc/refman/5.7/en/

load<            
            
                            

                文章标题：MySQL的文本导入之loaddatalocal                

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