Open Source Server Side Scripting ECA 236 Open Source Server Side Scripting MySQL – Inserting Data

Open Source Server Side Scripting 2 ECA 236 sitename table users user_idMEDIUMINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY first_nameVARCHAR(15) NOT NULL last_nameVARCHAR(30) NOT NULL VARCHAR(40) passwordCHAR(16) NOT NULL registration_dateDATETIME NOT NULL

Open Source Server Side Scripting 3 ECA 236 INSERT  1 st way to INSERT data:  specify the columns to be used  syntax:  using this way, you can add rows of records, but populate only the fields you want  unspecified columns will be treated as NULL or given a default value INSERT INTO tablename (column1, column2, column5 ) VALUES( ‘value1’, ‘value2’, ‘value5’ );

Open Source Server Side Scripting 4 ECA 236 INSERT cont …  2 nd way to INSERT data:  do not specify columns  syntax:  using this way, you include a value for every column, even if NULL  failure to match number of values to number of columns will generate an error INSERT INTO tablename VALUES ( ‘value1’, NULL, ‘value3’ );

Open Source Server Side Scripting 5 ECA 236 INSERT cont …  2 nd way to INSERT data:  to insert multiple rows, separate each record with a comma  syntax: INSERT INTO tablename VALUES ( ‘value1’, NULL, ‘value3’ ), ( ‘value4’, NULL, ‘value6’ ), ( ‘value7’, NULL, ‘value9’ ) ;

Open Source Server Side Scripting 6 ECA 236 NOW( )  NOW( ) is a MySQL function  use NOW( ) with date data types  NOW( ) inserts the current date and time into a column  do not put a space between the function name and the parentheses

Open Source Server Side Scripting 7 ECA 236 inserting data into users  to insert a new row into the users table:  use the NOW( ) function to insert the current date information  notice that NOW( ) is not enclosed in quotes INSERT INTO users (first_name, last_name, , password, registration_date) VALUES ('John', 'Lennon', PASSWORD('Happin3ss'), NOW( ));

Open Source Server Side Scripting 8 ECA 236 inserting data into users cont …  we left out the user_id column  user_id will be set to NULL  because user_id is AUTO_INCREMENT, MySQL will set the value to the next logical number INSERT INTO users (first_name, last_name, , password, registration_date) VALUES ('John', 'Lennon', PASSWORD('Happin3ss'), NOW( ));

Open Source Server Side Scripting 9 ECA 236 inserting data into users  to INSERT several more records: INSERT INTO users (first_name, last_name, , password, registration_date) VALUES ('Paul', 'McCartney', PASSWORD('letITbe'), NOW( )), ('George', 'Harrison', ', PASSWORD('something'), NOW( )), ('Ringo', 'Starr', PASSWORD('thisboy'), NOW( ));

Open Source Server Side Scripting 10 ECA 236 inserting data into users  when using INSERT enclose strings with single quotes  do not quote numbers or function calls  to INSERT a value that contains a single quote, escape the quote with a backslash

Open Source Server Side Scripting 11 ECA 236 loading text files into tables  in some situations you may have to change the configuration of the my.ini file  modify my.ini file, usually located in Windows or WINNT directory  add the following code to the [mysqld] section [mysqld] set-variable=local-infile=0

Open Source Server Side Scripting 12 ECA 236 loading text files into tables cont …  text files should contain:  one row for each record to be loaded  each column separated with a delimiter  you can specify delimiter and end of line marker  by default, MySQL uses a tab and linefeed  NULL values may be represented with \N tabs first_name last_name password

Open Source Server Side Scripting 13 ECA 236 loading text files into tables cont …  LOAD DATA INFILE  loads a text file into a table  for more information visit the MySQL Manual:  Loading Data into a Table  Security issues with LOAD DATA LOCAL  LOAD DATA INFILE Syntax LOAD DATA INFILE “path_to/file_name.txt” INTO TABLE table_name;

Open Source Server Side Scripting 14 ECA 236 loading text files into tables cont …  EXERCISE  download users_data.txt from web site  create a folder one level down from C: named data  save users_data.txt  in mysql monitor:  view table after data has loaded LOAD DATA INFILE “c:/data/users_data.txt” INTO TABLE users; SELECT * FROM users;

Open Source Server Side Scripting 15 ECA 236 SELECT … INTO OUTFILE  complements LOAD DATA INFILE  write data from a database to a file  defaults: >writes tabs between fields >writes newlines at end of lines  when working on Windows, escape backslash SELECT * INTO OUTFILE ‘c:\\data\\into_outfile.txt’ FROM users;

Open Source Server Side Scripting 16 ECA 236 UPDATE  UPDATE allows you to modify existing records  syntax:  UPDATE multiple columns by separating with comma  use a WHERE clause to identify rows to UPDATE UPDATE table_name SET column = ‘value’; UPDATE table_name SET column1 = ‘value1’, column2 = ‘value2’; UPDATE table_name SET column3 = ‘value’ WHERE column1 = ‘value1’;

Open Source Server Side Scripting 17 ECA 236 UPDATE cont …  the users table contains unencrypted passwords  use PASSWORD( ) function to encrypt current unencrypted values in password column  notice there are not quotes around password being passed to PASSWORD( ) UPDATE users SET password = PASSWORD(password) WHERE user_id >= 5;

Open Source Server Side Scripting 18 ECA 236 UPDATE cont …  registration_date has been set to zero for all new entries  use the WHERE clause to affect only those rows with a registration_date set to zero UPDATE users SET registration_date = NOW( ) WHERE registration_date = 0;

Open Source Server Side Scripting 19 ECA 236 LOCAL  LOAD DATA LOCAL INFILE  if the LOCAL keyword is included the file is read by the client program on the client machine, and sent to the server  if the LOCAL keyword is not included the file must be located on the server  files to be loaded must be readable by all

Open Source Server Side Scripting 20 ECA 236 backing up a database  mysqldump  will back up tables and their structure  run directly from command line  dump file to the screen: mysqldump -u root -p sitename

Open Source Server Side Scripting 21 ECA 236 backing up a database cont …  mysqldump  create an output file  contains SQL commands to create the table  contains data to populate the table mysqldump -u root -p sitename > c:/data/mydump.sql

Open Source Server Side Scripting 22 ECA 236 backing up a database cont …  mysqldump  read the file back into MySQL using the syntax:  review MySQL Manual for a long list of options to use with mysqldump mysql -u root -p sitename < c:/data/mydump.sql

Open Source Server Side Scripting 23 ECA 236 source  to run MySQL statements stored in a text file  use source or \.  takes the filename as an argument  do not use quotes or semicolon \. C:/data/insert_record.sql source path_to/file_name.txt \. path_to/file_name.txt