<html><head><title>PgAccess - Tutorial</title></head> <body bgcolor="#C0C0C0"> <h1>PgAccess - Tutorial</h1> <a name="admin"><h2>User Administration</h2> The procedure for setting up <b>postgreSQL</b> usually results in a single user named <samp>postgres</samp>. In order for anyone else to use <b>postgreSQL</b>, users must be added. The program <samp>createuser</samp> accomplishes this. First become the PostgreSQL administrator (usually <samp>postgres</samp>):<p> <samp>su postgres</samp><p> Then create a new user:<p> <samp>createuser jim<br> Enter user's postgres ID or RETURN to use unix user ID: 500 -><br> Is user "jim" allowed to create databases (y/n) y<br> Is user "jim" a superuser? (y/n) n<br> createuser: jim was successfully added</samp><p> You can use either the UNIX user ID or the postgres ID to identify users. See the <b>postgreSQL</b> documentation in the "admin" section for a fuller account of users and groups.<p> To remove users, use the <samp>destroyuser</samp> command in the same way.<p> <img src="screen1.jpg" border=1 align=right> <a name="basic"><h2>Basic use of PgAccess</h2> <h3>Creating a database</h3> At the right is the window you should see when PgAccess starts up. The first task for most users will be to create a database.<p> Press the <em>New</em> button to bring up the window shown below. This will allow you to specify the structure of the new table. It is important to note that if you haven't specified a database when starting up PgAccess, this table will be created in the database named <samp><username></samp>, your username.<p> Assume that you want to create a table with entries describing bibliographic references in the field of chemistry. Choose a table name, such as <samp>chemref</samp> that will be easy to recall and find in a list. Enter the table name in the first input field.<p> When you already have tables in a database, you can use the <em>Inherits</em> button to toggle a list of existing tables to inherit characteristics of another table. In this example, there should be no previous tables to use.<p> Enter each field, giving it a name, field type and size, if the field type does not imply the size. That is, if your first field was to be a sequence number, and you selected <em>int2</em> as the field type, you would not have to specify a field size. However, if your second field was to contain the author of the reference, and was a <em>varchar</em> type, you would have to specify how many characters would be allowed in the field.<p> As you enter each field, click the <em>Add field</em> button to add it to the list at the right side of the window. You can change the position of fields using the <em>Move field up</em> and <em>Move field down</em> buttons, or delete a field if you decide it isn't what you wanted. When you are finished specifying fields, press the <em>Create table</em> button.<p> <img src="newtable.jpg" border=1 align=right> <a href="index.html#tut">Back to index</a> </body></html>
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