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69 lines
2.7 KiB
Plaintext
69 lines
2.7 KiB
Plaintext
NAME
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mdb-sql - SQL interface to MDB Tools
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SYNOPSIS
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mdb-sql [-HFp] [-d <delimiter>] [-i <file>] [-o <file>] [<database>]
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DESCRIPTION
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mdb-sql is a utility program distributed with MDB Tools.
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mdb-sql allows querying of an MDB database using a limited SQL subset
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language.
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OPTIONS
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-H Supress header row.
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-F Supress footer row.
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-p Turn off pretty printing. By default results are printed in an
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ascii table format which looks nice but is not conducive to manipulating the
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output with unix tools. This option prints output plainly in a tab separated
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format.
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-d Specify an alternative column delimiter. If no delimiter is
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specified, columns will be delimited by a tab character if pretty printing
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(-p) is turned off. If pretty printing is enabled this option is meaningless.
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-i Specify an input file. This option allows an input file containing the SQL to be passed to mdb-sql. See Notes.
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-o Specify an output file. This option allows the name of an output file to be used instead of stdout.
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COMMANDS
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mdb-sql in interactive mode takes some special commands.
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connect to <database> If no database was specified on the command line this command is necessary before any querys are issued. It also allows the switching of databases once in the tool.
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disconnect Will disconnect from the current database.
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go Each batch is sent to the parser using the 'go' command.
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reset A batch can be cleared using the 'reset' command.
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list tables The list tables command will display a list of available tables in this database, similar to the mdb-tables utility on the command line.
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describe table <table> Will display the column information for the specified table.
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quit Will exit the tool.
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SQL LANGUAGE
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The currently implemented SQL subset is quite small, supporting only single table queries, no aggregates, and limited support for WHERE clauses. Here is a brief synopsis of the supported language.
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select: SELECT [* | <column list>] FROM <table> WHERE <where clause>
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column list: <column> [, <column list>]
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where clause: <column> <operator> <literal> [AND <where clause>]
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operator: =, =>, =<, <>, like, <, >
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literal: integers, floating point numbers, or string literal in single quotes
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NOTES
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When passing a file (-i) or piping output to mdb-sql the final 'go' is optional. This allow constructs like
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echo "Select * from Table1" | mdb-sql mydb.mdb
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to work correctly.
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The -i command can be passed the string 'stdin' to test entering text as if using a pipe.
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HISTORY
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mdb-sql first appeared in MDB Tools 0\.3
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AUTHORS
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The mdb-sql utility was written by Brian Bruns
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BUGS
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The supported SQL syntax is a very limited subset and deficient in several ways.
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