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1 @c -*-texinfo-*-
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2 @c This is part of the XEmacs Lisp Reference Manual.
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3 @c Copyright (C) 1996 Ben Wing.
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4 @c See the file lispref.texi for copying conditions.
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5 @setfilename ../../info/databases.info
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6 @node Databases, Processes, Range Tables, top
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7 @chapter Databases
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8 @cindex database
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9
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10 @defun databasep object
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11 This function returns non-@code{nil} if @var{object} is a database.
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12 @end defun
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13
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14 @menu
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15 * Connecting to a Database::
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16 * Working With a Database::
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17 * Other Database Functions::
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18 @end menu
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19
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20 @node Connecting to a Database
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21 @section Connecting to a Database
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22
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23 @defun open-database file &optional type subtype access mode
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24 This function opens database @var{file}, using database method
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25 @var{type} and @var{subtype}, with access rights @var{access} and
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26 permissions @var{mode}. @var{access} can be any combination of @code{r}
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27 @code{w} and @code{+}, for read, write, and creation flags.
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28 @end defun
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29
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30 @defun close-database obj
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31 This function closes database @var{obj}.
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32 @end defun
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33
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34 @defun database-live-p obj
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35 This function returns @code{t} iff @var{obj} is an active database, else
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36 @code{nil}.
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37 @end defun
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38
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39 @node Working With a Database
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40 @section Working With a Database
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41
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42 @defun get-database key dbase &optional default
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43 This function finds the value for @var{key} in @var{database}. If there is no
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44 corresponding value, @var{default} is returned (@code{nil} if @var{default} is
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45 omitted).
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46 @end defun
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47
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48 @defun map-database function dbase
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49 This function maps @var{function} over entries in @var{database},
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50 calling it with two args, each key and value in the database.
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51 @end defun
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52
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53 @defun put-database key val dbase &optional replace
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54 This function stores @var{key} and @var{val} in @var{database}. If
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55 optional fourth arg @var{replace} is non-@code{nil}, replace any
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56 existing entry in the database.
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57 @end defun
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58
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59 @defun remove-database key dbase
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60 This function removes @var{key} from @var{database}.
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61 @end defun
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62
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63 @node Other Database Functions
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64 @section Other Database Functions
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65
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66 @defun database-file-name obj
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67 This function returns the filename associated with the database @var{obj}.
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68 @end defun
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69
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70 @defun database-last-error &optional obj
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71 This function returns the last error associated with database @var{obj}.
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72 @end defun
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73
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74 @defun database-subtype obj
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75 This function returns the subtype of database @var{obj}, if any.
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76 @end defun
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77
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78 @defun database-type obj
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79 This function returns the type of database @var{obj}.
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80 @end defun
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