GoLand 2024.1 Help

Databases

GoLand displays databases that you select to be displayed. It can be useful if you have many databases. Also, by using this approach, you define which databases you want to introspect. During introspection, GoLand loads the metadata from the database and uses this data later.

Databases (Database) can be found in the Database tool window. For the reference on other node and object icons, refer to the Data sources and their elements chapter of Database tool window topic.

Databases in Database

Create a database

  1. In the Database tool window ( View | Tool Windows | Database) , expand the data source tree until the nodes of databases.

  2. Right-click the data source or database node and select New | Database.

  3. In the Create dialog that opens, enter the name of your database in the Name field.

  4. In the Preview pane, you can view and change the generated SQL code.

  5. Click OK to add your database.

the Create database dialog

Display databases

Show and hide databases

  • In the Database tool window ( View | Tool Windows | Database) , right-click a data source and navigate to Tools | Manage Shown Schemas. Select or clear checkboxes of databases that you want to display or hide. Press Enter.

  • Click the N of M link near the data source name. In the database and schema selection window, select or clear checkboxes of databases that you want to display or hide. Press Enter.

    Show and hide schemas and databases

Use pattern-based filter

To display and introspect all the databases with names that match a regular expression pattern, do the following:

  1. In the Database tool window ( View | Tool Windows | Database) , click the N of M link near the data source name.

  2. In the databases and schemas selector, click the add pattern button near All databases.

    Pattern-based schema filter
  3. In the new filtering node, define the regular expression. For the syntax, click regex for databases near the input field. For more information about the syntax, refer to Summary of regular-expression constructs.

    Press Enter to apply the filter in the selector.

    Regular expressions in pattern-based schema filter
  4. Press Enter to apply the filter in Database tool window.

    The filtering node with filter can be added under any node, including another filtering node.

Show all the schemas and databases

  • To display all the available databases in the Database tool window ( View | Tool Windows | Database), click the Show Options Menu button and select the All Namespaces option.

    • Enabled

      Show All Namespaces is enabled
    • Disabled

      Show All Namespaces is disabled

Force refresh schema information

The Force Refresh action clears the data source information from cache and loads it again from scratch.

  • In the Database tool window ( View | Tool Windows | Database) , right-click a data source and select Diagnostics | Force Refresh.

Generate a diagram for a dataase

  • In the Database tool window ( View | Tool Windows | Database) , right-click a dataase and select Diagrams | Show Diagram.

Generate a diagram for a database object

Summary of regular-expression constructs

For full information, refer to Full Java Regular Expressions syntax description and Using Regular Expressions in Java.

Construct

Matches

Characters

x

The character x

\\

The backslash character

\0n

The character with octal value 0n (0 <= n <= 7)

\0nn

The character with octal value 0nn (0 <= n <= 7)

\0mnn

The character with octal value 0mnn (0 <= m <= 3, 0 <= n <= 7)

\xhh

The character with hexadecimal value 0xhh

\uhhhh

The character with hexadecimal value 0xhhhh

\t

The tab character ('\u0009')

\n

The newline (line feed) character ('\u000A')

\r

The carriage-return character ('\u000D')

\f

The form-feed character ('\u000C')

\a

The alert (bell) character ('\u0007')

\e

The escape character ('\u001B')

\cx

The control character corresponding to x

Character classes

[abc]

a, b, or c (simple class)

[^abc]

Any character except a, b, or c (negation)

[a-zA-Z]

a through z or A through Z, inclusive (range)

[a-d[m-p]]

a through d, or m through p: [a-dm-p] (union)

[a-z&&[def]]

d, e, or f (intersection)

[a-z&&[^bc]]

a through z, except for b and c: [ad-z] (subtraction)

[a-z&&[^m-p]]

a through z, and not m through p: [a-lq-z](subtraction)

Predefined character classes

.

Any character (may or may not match line terminators)

\d

A digit: [0-9]

\D

A non-digit: [^0-9]

\s

A whitespace character: [ \t\n\x0B\f\r]

\S

A non-whitespace character: [^\s]

\w

A word character: [a-zA-Z_0-9]

\W

A non-word character: [^\w]

POSIX character classes (US-ASCII only)

\p{Lower}

A lower-case alphabetic character: [a-z]

\p{Upper}

An upper-case alphabetic character:[A-Z]

\p{ASCII}

All ASCII:[\x00-\x7F]

\p{Alpha}

An alphabetic character:[\p{Lower}\p{Upper}]

\p{Digit}

A decimal digit: [0-9]

\p{Alnum}

An alphanumeric character:[\p{Alpha}\p{Digit}]

\p{Punct}

Punctuation: One of !"#$%&'()*+,-./:;=>?@[\]^_`{|}~

\p{Graph}

A visible character: [\p{Alnum}\p{Punct}]

\p{Print}

A printable character: [\p{Graph}\x20]

\p{Blank}

A space or a tab: [ \t]

\p{Cntrl}

A control character: [\x00-\x1F\x7F]

\p{XDigit}

A hexadecimal digit: [0-9a-fA-F]

\p{Space}

A whitespace character: [ \t\n\x0B\f\r]

java.lang.Character classes (simple java character type)

\p{javaLowerCase}

Equivalent to java.lang.Character.isLowerCase()

\p{javaUpperCase}

Equivalent to java.lang.Character.isUpperCase()

\p{javaWhitespace}

Equivalent to java.lang.Character.isWhitespace()

\p{javaMirrored}

Equivalent to java.lang.Character.isMirrored()

Classes for Unicode blocks and categories

\p{InGreek}

A character in the Greek block (simple block)

\p{Lu}

An uppercase letter (simple category)

\p{Sc}

A currency symbol

\P{InGreek}

Any character except one in the Greek block (negation)

[\p{L}&&[^\p{Lu}]]

Any letter except an uppercase letter (subtraction)

Boundary matchers

^

The beginning of a line

$

The end of a line

\b

A word boundary

\B

A non-word boundary

\A

The beginning of the input

\G

The end of the previous match

\Z

The end of the input but for the final terminator, if any

\z

The end of the input

Greedy quantifiers

X?

X, once or not at all

X*

X, zero or more times

X+

X, one or more times

X{n}

X, exactly n times

X{n,}

X, at least n times

X{n,m}

X, at least n but not more than m times

Reluctant quantifiers

X??

X, once or not at all

X*?

X, zero or more times

X+?

X, one or more times

X{n}?

X, exactly n times

X{n,}?

X, at least n times

X{n,m}?

X, at least n but not more than m times

Possessive quantifiers

X?+

X, once or not at all

X*+

X, zero or more times

X++

X, one or more times

X{n}+

X, exactly n times

X{n,}+

X, at least n times

X{n,m}+

X, at least n but not more than m times

Logical operators

XY

X followed by Y

X|Y

Either X or Y

(X)

X, as a capturing group

Back references

\n

Whatever the nth capturing group matched

Quotation

\

Nothing, but quotes the following character

\Q

Nothing, but quotes all characters until \E

\E

Nothing, but ends quoting started by \Q

Special constructs (non-capturing)

(?:X)

X, as a non-capturing group

(?idmsux-idmsux)

Nothing, but turns match flags on - off

(?idmsux-idmsux:X)

X, as a non-capturing group with the given flags on - off

(?=X)

X, via zero-width positive lookahead

(?!X)

X, via zero-width negative lookahead

(?<=X)

X, via zero-width positive lookbehind

(?<!X)

X, via zero-width negative lookbehind

(?>X)

X, as an independent, non-capturing group

Last modified: 24 May 2024