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Table 5-3 psql Prompt Substitution Characters
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The psql prompts can be customized to reflect many features of your database connection:
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test=>\set PROMPT1 %n@%~%R%# fred@test=>
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Besides setting the default variables, you can create your own variables that are used during the psql session Here is an example of creating your own variable:
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test=> \set cust 'store"Customer"' test=> select * from :cust; CustomerID | LastName | FirstName | Address | City | State | Zip | Phone + + -+ + + + + BLU001 | Blum | Rich | 123 Main | Chicago | IL | 60633 | 555-1234 (1 row) test=>
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The variable cust is set to the full pathname of the Customer table The variable can then be referenced in any SQL statement by preceding it with a colon (:)
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Query Buffer Meta-commands
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The query buffer meta-commands display and control the contents of the internal psql query buffer This buffer contains the most recently submitted SQL query statement processed by psql These commands are listed and described in Table 5-4 These commands allow you to manipulate the query buffer by editing the query currently in the buffer Here is an example of using the query buffer commands:
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test=> \set pr 'store"Product"' test=> select * from :pr; ProductID | ProductName | Model | Manufacturer | UnitPrice | Inventory + + + + + LAP001 | Laptop | Takealong | Acme | 500 | 10 (1 row) test=> \p select * from store"Product"; test=> \g ProductID | ProductName | Model | Manufacturer | UnitPrice | Inventory + + + + + LAP001 | Laptop | Takealong | Acme | 500 | 10 (1 row) test=> \r Query buffer reset (cleared) test=> \p Query buffer is empty test=>
Command \e [file] \g [file]
Description Edit the query buffer (or file) with an external editor (Windows Notepad) Send the query buffer to the PostgreSQL server Place the results in file if specified This can be a full pathname, or a file located in the directory psql was started from Display the current contents of the query buffer Reset the contents of the query buffer Write the contents of the query buffer to file This can be a full pathname, or a file located in the directory psql was started from
\p \r \w file
Table 5-4 psql Query Buffer Meta-commands
PostgreSQL 8 for Windows
Notice that even though a variable is used for the SQL statement, the query buffer contains the expanded variable text The \g command is used to rerun the SQL statement in the query buffer The \r command resets (empties) the query buffer
Input/Output Meta-commands
The input/output meta-commands control the way SQL statements are input to psql and how output should be handled Table 5-5 lists and describes these commands The \i command is extremely helpful This command allows you to run SQL statements stored in files on the system This includes any files created by the pg_dump backup program (described in 3) that were created using the plain backup format By default, the file must be located in the same directory you started psql from If it is not, you must specify the full pathname for the file If the pathname includes spaces, you must enclose the filename in double quotes While in interactive mode the \echo command may seem silly, it is often used to insert comments within stored SQL statements The echoed strings appear within the standard command output As an example, create the file testsql, and enter the following lines:
\echo Customer query result select * from store"Customer"; \echo Product query result select * from store"Product";
Now, within a psql session, use the \i meta-command to run the SQL file:
test=> \i testsql Customer Query result CustomerID | LastName | FirstName | Address | City | State | Zip | Phone + + + + + + + BLU001 | Blum | Rich | 123 Main | Chicago | IL | 60633 | 555-1234 (1 row) Product Query result ProductID | ProductName | Model | Manufacturer | UnitPrice | Inventory + + + + + LAP001 | Laptop | Takealong | Acme | 500 | 10 (1 row) test=>
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