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More basics on DB access

More basics on DB access. Elke A. Rundensteiner. Working with the Data Server. Basic SQL Commands. CREATE TABLE student(sNum INTEGER,sName VARCHAR (30)); -- creates table student with two columns

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More basics on DB access

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  1. More basics on DB access Elke A. Rundensteiner

  2. Working with the Data Server

  3. Basic SQL Commands CREATE TABLE student(sNum INTEGER,sName VARCHAR (30)); -- creates table student with two columns INSERT INTO student VALUES (1, ‘Joe’); -- insert one row into the student table SELECT * FROM student; -- select all rows from student table DELETE FROM student; -- delete all rows in the student table DROP TABLE student; -- drop student table Purge recyclebin; -- purge recyclebin tables that get created. -- Only works if you are logged onto CCC1

  4. Saving your Interactive Session in SQLPlus • If you want to save your output to a file (for homework) • spool <fileName> • <executeCmds to create tables ...> • spool off;

  5. Running scripts in SQLPlus • To enter OS environment, use sqlplus command: Host • Now you can execute OS commands, like : cd.. , exit, etc.

  6. Running scripts in SQLPlus • Create a file in your file system in the current directory called : createTable.sql • @createTable -- executes the script • start createTable -- also executes the script

  7. Saving your Interactive Session in SQLPlus • If you want to save your output to a file (for homework) • spool <fileName> • <executeCmds to create tables ...> • spool off; • Similar to script in unix.

  8. Loading data from a text file • Create a table : • CREATE TABLE myTable1 (a int, b int); • Create data file, say: • sample.dat • Put data into the file : 1,11 2,22 3,33 4,44

  9. Loading from text file (Contd) • Create control file, say load.ctl LOAD DATA INFILE sample.dat INTO TABLE myTable1 FIELDS TERMINATED BY ‘,’ (a,b) • Invoke SQL Loader (from your UNIX shell): • $ sqlldr <user/password> control=load.ctl

  10. Building Interfaces • Call Level Interface • Perl – to build web interfaces • JDBC – Java, servlets, java swing, etc • Embedded SQL • C API (Pro*C) • C++API (Pro*C++) • Java API (SQLJ) [ Oracle ]

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