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osqsh
executable file
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osqsh
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#!/usr/bin/perl
##########################################################################
# Oracle client CLI wrapper for SQLPlus that adds Readline support.
#
# This isn't likely to be any kind of full replacement for SQLPlus,
# but readline support should make it more user friendly (if a modern
# CLI is your friend).
#
##########################################################################
use warnings;
use strict;
use Term::ReadLine;
use DBD::Oracle;
use Getopt::Long;
## Command Line Interface options
#
my $cli_opts_ref = &loadcliopts;
my %cli_opts = %$cli_opts_ref;
my $debug = $cli_opts{'debug'};
if ( $debug ) { print "debug on\n"; }
## load contents of rc file if any
#
my $rcf_opts_ref = &load_rcfile;
my %rcf_opts = %$rcf_opts_ref;
## assign mandatory values
# make sure each of these values has something in it
# load_neededvars subroutine modifies %ENV
#
my @need_oravals = qw(
ORACLE_HOME
ORACLE_SID
ORACLE_USER
ORACLE_PASS
TNS_ADMIN
);
my $oracle_settings_ref = &load_oracle_vals ( \%cli_opts , \%rcf_opts , @need_oravals );
my %oracle_settings = %$oracle_settings_ref;
## connect to database
#
my $dbh = DBI->connect(
"dbi:Oracle:$oracle_settings{'ORACLE_SID'}" ,
"$oracle_settings{'ORACLE_USER'}" ,
"$oracle_settings{'ORACLE_PASS'}" ,
{
RaiseError => 0,
AutoCommit => 1,
ora_check_sql => 0,
RowCacheSize => 16
}
) || die( $DBI::errstr . "\n" );
## set up readline with tab completion and load miscellaneous tab-completion words
#
my $term = Term::ReadLine->new('OSqsh');
my @user_tables = &load_usertables( $dbh );
my %nice_tabs = (
basic_cmd => [ 'select' , 'insert' , 'into' , 'create' , 'from' , 'where' ,
'group by' , 'having' , 'exists' , 'order by' ,
'between' , 'min' , 'max ' , 'like' ],
data_type => [ 'varchar2' , 'number' , 'timestamp' ],
sys_table => [ 'dual' ],
sqlplscmd => [ 'describe' , 'exit' , 'quit' ],
usr_table => \@user_tables,
usr_colmn => [ ]
);
&load_completion( $term , \%nice_tabs );
## now run the prompt
#
my $prompt = "OSQSH> ";
&do_prompt( $dbh , $term , $prompt , \%nice_tabs );
## end
#
print "\n";
END {
$dbh->disconnect if defined($dbh);
}
##########################################################################
# Subroutines
##########################################################################
##########################################################################
# sub load_rcfile
# input: none
# return: reference to hash containing settings in rc file
# (hash will be empty if there there is no rc file)
# Reads values from ~/.osqshrc
##########################################################################
sub load_rcfile {
my %local_rc_vars;
unless ( defined $ENV{'HOME'} ) {
return \%local_rc_vars;
}
my $rc_file = "$ENV{'HOME'}/.osqshrc";
unless ( -f $rc_file ) {
return \%local_rc_vars;
}
unless ( open ( RCFILE , "$rc_file" ) ) {
warn "Unable to open $rc_file\n";
return \%local_rc_vars;
}
while (<RCFILE>) {
chomp; # no newline
s/#.*//; # no comments
s/^\s+//; # no leading white
s/\s+$//; # no trailing white
next unless m/(.+)\s*=\s*(.+)/;
if ( defined($1) and defined($2) ) {
# my $key = uc($1);
# my $value = $2;
# $local_rc_vars{$key} = $value;
$local_rc_vars{uc($1)} = $2;
}
}
close (RCFILE);
return \%local_rc_vars;
}
##########################################################################
# sub load_oracle_vals
# input:
# options hash ref,
# rc file values hash ref,
# list of mandatory variables
# return: reference to hash containing oracle settings
# also updates %ENV
# Makes sure required Oracle variables are loaded
# value prioritization is:
# 1. command line option
# 2. environment variable
# 3. rc file
# 4. if all above are empty, then ask nicely
##########################################################################
sub load_oracle_vals {
my ( $cli_opts_ref , $rcf_opts_ref , @need_oravals ) = @_;
my %cli_opts = %$cli_opts_ref;
my %rcf_opts = %$rcf_opts_ref;
my %oracle_settings;
## first, load cli options into settings
#
foreach my $this_cli_opt ( keys %cli_opts ) {
$oracle_settings{$this_cli_opt} = $cli_opts{$this_cli_opt};
}
## as a special condition, warn if the user but not pass was given on cli
#
if ( ( defined $oracle_settings{'ORACLE_USER'} ) and ( ! defined $oracle_settings{'ORACLE_PASS'} ) ) {
print "User given on CLI but no pass!\n";
}
## second, load environment variables into settings
# if they haven't already been defined on the cli
#
foreach my $this_oravar ( @need_oravals ) {
if (
( ! defined $oracle_settings{$this_oravar} ) and
( defined $ENV{$this_oravar} ) ) {
$oracle_settings{$this_oravar} = $ENV{$this_oravar};
}
}
## third, check rc file
#
foreach my $this_rcf_opt ( keys %rcf_opts ) {
## warn if environment overrides an rc setting
# because this can drive you crazy
#
if (
( defined $ENV{$this_rcf_opt} ) and
( $ENV{$this_rcf_opt} ne $rcf_opts{$this_rcf_opt}) ) {
warn "$this_rcf_opt in environment overrides rcfile.\n";
next;
}
## don't bother to warn for CLI overrides
#
next if ( defined $cli_opts{$this_rcf_opt} );
$oracle_settings{$this_rcf_opt} = $rcf_opts{$this_rcf_opt};
}
## fourth assign any mandatory values that haven't already been assigned
#
foreach my $this_oravar ( @need_oravals ) {
if ( ! defined $oracle_settings{$this_oravar} ) {
print "Enter $this_oravar: ";
my $input_var = <STDIN>;
chomp $input_var;
$oracle_settings{$this_oravar} = $input_var;
}
## make sure environment matches
#
$ENV{$this_oravar} = $oracle_settings{$this_oravar};
if ( $debug ) { print "We have added $this_oravar is $oracle_settings{$this_oravar}\n"; }
}
return \%oracle_settings;
}
##########################################################################
# sub load_usertables
# input: database handle
# return: list of table names
# Get the table names from USER_TABLES
##########################################################################
sub load_usertables {
my ( $dbh_ref ) = @_;
my $cmd = "SELECT TABLE_NAME FROM USER_TABLES";
my @load_tables = map { $_ = $_->{'TABLE_NAME'}; } @{ $dbh->selectall_arrayref( $cmd, { Slice => {} }) };
return @load_tables;
}
##########################################################################
# sub load_completion
# input: ref to Term::ReadLine object , ref to hash with various words to complete
# return: list of possible words to auto-complete
# Readline tab completion with minimal intelligence
##########################################################################
sub load_completion {
my ( $term_ref , $nice_tabs_ref ) = @_;
## just load everything into a big list
#
my %local_tabs = %$nice_tabs_ref;
my @these_words;
foreach my $this_key ( keys %$nice_tabs_ref ) {
push @these_words , @{$local_tabs{$this_key}};
}
## remove duplicates and add both upper and lower case
#
my %lc_keys;
map { $lc_keys{lc($_)} = '' } @these_words;
my @tab_words = ( keys %lc_keys , map { uc($_) } keys %lc_keys );
## hack
#
my @just_tables = @{$local_tabs{'usr_table'}};
push @just_tables , map { lc($_) } @just_tables;
## hack
# if we dont know about table columns, return whatever we have
#
my @just_columns = @{$local_tabs{'usr_colmn'}};
push @just_columns , map { lc($_) } @just_columns;
if ( @just_columns == 0 ) { @just_columns = @tab_words; }
$term_ref->Attribs->{attempted_completion_function} = sub {
my ($text, $line, $start, $end) = @_;
if ( $line =~ m/^\s*$/i ) {
$term_ref->Attribs->{completion_word} = [ ( "\t" )];
} elsif ( $line =~ m/\s+FROM\s+\w*$/i ) {
$term_ref->Attribs->{completion_word} = [@just_tables];
} elsif ( $line =~ m/SELECT\s+\w*$/i ) {
$term_ref->Attribs->{completion_word} = [@just_columns];
} elsif ( $line =~ m/^des(c|cr|cri|crib|cribe)\s+/i ) {
$term_ref->Attribs->{completion_word} = [@just_tables];
} else {
$term_ref->Attribs->{completion_word} = [@tab_words];
}
my $front_bound = '';
if ( $text =~ s/^(\w+\.)// ) {
$front_bound = $1;
}
my @ret = $term->completion_matches($text, $term_ref->Attribs->{list_completion_function});
@ret = map { $front_bound.$_ } @ret;
return @ret;
};
return 0;
}
##########################################################################
# sub get_column_names
# input: database handle, table name
# return: list of column names in given table
# Get column names for a given table. Used by DESCRIBE surrogate
##########################################################################
sub get_column_names {
my ( $dbh_ref , $read_table ) = @_;
my $cmd = uc("SELECT COLUMN_NAME FROM ALL_COL_COMMENTS WHERE TABLE_NAME = '$read_table'");
my @load_columns = map { $_ = $_->{COLUMN_NAME}; } @{ $dbh->selectall_arrayref( $cmd, { Slice => {} })};
return @load_columns;
}
##########################################################################
# sub get_column_data
# input: database handle, prepared sql statement handle
# return: reference to list of arrays containing information on table columns
# Get column information for a given table used in sql statement.
# It would be nice to return this info in a hash instead of an array,
# but it works better if this structure mirrors the array containing result set.
##########################################################################
sub get_column_data {
my ( $dbh_ref , $sth_ref ) = @_;
## collect column data
# there MUST be a better way to do this
#
my @column_names = @{ $sth_ref->{NAME} };
my @precision = @{ $sth_ref->{PRECISION} };
my @scale = @{ $sth_ref->{SCALE} };
my @type_num = @{ $sth_ref->{TYPE} };
my @column_stuff;
my $count_columns = 0;
foreach my $this_col_name ( @column_names ) {
$column_stuff[$count_columns]{'col_name'} = $this_col_name;
$column_stuff[$count_columns]{'precision'} = $precision[$count_columns];
$column_stuff[$count_columns]{'scale'} = $scale[$count_columns];
$column_stuff[$count_columns]{'maxwidth'} = length($this_col_name); # minimum width
## column type by name in eval because DBD may not support all column types
# start by adding known type that confuses DBD but query still succeeds
#
if ( $type_num[$count_columns] == 95 ) {
$column_stuff[$count_columns]{'col_type'} = 'TIMESTAMP W/TZ';
} else {
eval { $column_stuff[$count_columns]{'col_type'} = $dbh_ref->type_info($type_num[$count_columns])->{TYPE_NAME}; };
if ($@) {
$column_stuff[$count_columns]{'col_type'} = "TYPE_$type_num[$count_columns]";
$column_stuff[$count_columns]{'col_fail'} = $type_num[$count_columns];
}
}
## column left or right justify
#
my @right_justify_types = ( 'DECIMAL' , 'DATE' , 'NUMBER' , 'DOUBLE PRECISION' );
if ( grep m/$column_stuff[$count_columns]{'col_type'}/ , @right_justify_types ) {
$column_stuff[$count_columns]{'justify'} = 'right';
} else {
$column_stuff[$count_columns]{'justify'} = 'left';
}
$count_columns++;
}
return \@column_stuff;
}
##########################################################################
# sub gen_table_header
# input: list of hashes with column information
# return: table header string
# Generates table header to use when displaying data retrieved
##########################################################################
sub gen_table_header {
my @column_stuff = @_;
my $header = "\n";
my $separator_line = '';
my $count_columns = 0;
foreach my $this_column ( @column_stuff ) {
my $width = $column_stuff[$count_columns]{'maxwidth'};
$separator_line .= '-' x $width . ' ';
$header .= sprintf( "%-${width}s", ${$this_column}{'col_name'});
$header .= ' ';
$count_columns++;
}
## remove trailing whitespace from both lines before combining
#
$header =~ s/\s^//;
$separator_line =~ s/\s^//;
$header .= "\n$separator_line\n";
return $header;
}
##########################################################################
# sub run_sql_command
# input: database handle, sql command
# return: list of references to lists containing table and header data
# Passes whatever it's been given on to the database returns the result
##########################################################################
sub run_sql_command {
my ( $dbh_ref , $sql_cmd ) = @_;
if ( $debug ) { print "Prepare to prepare!\n"; }
my $sth_ref;
eval {
$sth_ref = $dbh_ref->prepare($sql_cmd) or print "\nSQL fail!\n\n";
};
warn "stuff breaking in prepare: $dbh->errstr" if ($@);
if ( $debug ) { print "Prepared!\n"; }
if ( $sth_ref ) {
my $ary_info_ref = &get_column_data ( $dbh_ref , $sth_ref );
## if any cols have col_fail set to non-zero, the query will fail
#
my $breaks_driver = 0;
my $col_count = 1;
foreach my $this_col ( @$ary_info_ref ) {
my $failure = $$this_col{'col_fail'};
if ( defined $failure ) {
print "Unable to process $$this_col{'col_name'} (col $col_count)\n";
$breaks_driver += 1;
}
$col_count++;
}
if ( $breaks_driver != 0 ) { return ( \"This is not an array reference" , \"Neither is this" ); }
if ( $debug ) { print "Prepare to select!\n"; }
my $ary_ref;
eval {
$ary_ref = $dbh->selectall_arrayref($sql_cmd);
};
warn "stuff breaking in select: $dbh->errstr" if ($@);
if ( $debug ) { print "selectd!\n"; }
return ( $ary_ref , $ary_info_ref );
} else {
return ( \"This is not an array reference" , \"Neither is this" );
}
}
##########################################################################
# sub format_result
# input: reference to array containing data returned by database,
# and reference to array containing column information
# return: string of formatted data
# Puts the result of SQL command into a format approximating sqlplus
##########################################################################
sub format_result {
my ( $out_ref , $out_info_ref ) = @_;
my $display_result = '';
my @column_info = @$out_info_ref;
## loop over table to determine the widest element in each column
#
foreach my $this_row ( @$out_ref ) {
my $col_count = 0;
foreach my $this_col ( @$this_row ) {
## using (NULL) to represent null values, so length is 6
#
my $colwidth = ( defined($this_col) ) ? length( $this_col ) : 6;
if ( $colwidth > $column_info[$col_count]{'maxwidth'} ) {
$column_info[$col_count]{'maxwidth'} = $colwidth;
}
$col_count++;
}
}
my $header_string = &gen_table_header( @column_info );
$display_result .= "$header_string";
my $row_count = 0;
foreach my $this_row ( @$out_ref ) {
my $count_columns = 0;
foreach my $this_column ( @$this_row ) {
my $col_width = $column_info[$count_columns]{'maxwidth'};
my $justify;
if ( $column_info[$count_columns]{'justify'} eq 'right' ) {
$justify = "%";
} else {
$justify = "%-";
}
if ( ! defined $this_column ) { $this_column = '(NULL)'; }
$display_result .= sprintf( "$justify"."$col_width"."s", $this_column);
$display_result .= ' ';
$count_columns++;
}
$row_count++;
$display_result .= "\n";
}
$display_result .= "\n$row_count rows selected.\n\n";
return $display_result;
}
##########################################################################
# sub desc_table
# input: database handle, table name
# return: string containing formatted info, and list of column names
# The list of column names is to be used for tab-completion
##########################################################################
sub desc_table {
my ( $dbh_ref , $table_name ) = @_;
my $desc_cmd = uc("
SELECT COLUMN_NAME as Name,
DECODE ( NULLABLE, 'N' , 'NOT NULL' , ' ' ) as NULLABLE,
DATA_TYPE
|| DECODE
( ( NVL(CHAR_LENGTH,0) + NVL(DATA_PRECISION,0) ) ,
0 ,
'' ,
'(' || ( NVL(CHAR_LENGTH,0) + NVL(DATA_PRECISION,0) )
|| DECODE
( DATA_SCALE , NULL , '' , 0 , '' , ',' || DATA_SCALE )
|| ')'
)
as Type
FROM USER_TAB_COLUMNS
WHERE TABLE_NAME = '$table_name'
");
if ( $debug ) { print "SQL here:====\n$desc_cmd\n====\n"; }
my ( $result_ref , $result_columninfo_ref ) = &run_sql_command( $dbh_ref , $desc_cmd );
## print warning if no rows returned
#
if ( @$result_ref == 0 ) {
return ( "\nNo table $table_name in USER_TAB_COLUMNS\n\n" , () );
} else {
my $result_out = &format_result( $result_ref , $result_columninfo_ref );
my @column_names = &get_column_names( $dbh , $table_name );
return ( $result_out , @column_names );
}
}
##########################################################################
# sub loadcliopts
# input: none
# return: reference to hash of options given on CLI
# Used to load command line options
##########################################################################
sub loadcliopts {
my %options;
GetOptions (
'debug' => \$options{'debug'},
'oracle_user=s' => \$options{'ORACLE_USER'},
'oracle_pass=s' => \$options{'ORACLE_PASS'},
'oracle_sid=s' => \$options{'ORACLE_SID'},
);
## check for user/pass format if not passed explicitly
#
if ( ( ! defined $options{'ORACLE_USER'} ) and ( ! defined $options{'ORACLE_PASS'} ) ) {
foreach my $this_arg ( @ARGV ) {
if ( $this_arg =~ m/^(\w+)\/(\w+)$/ ) {
$options{'ORACLE_USER'} = $1;
$options{'ORACLE_PASS'} = $2;
}
last;
}
}
return \%options;
}
##########################################################################
# sub do_prompt
# input: reference to term handle, prompt (string)
# return: none
# This is the main loop.
##########################################################################
sub do_prompt {
my ( $dbh_ref , $term_ref , $prompt_string , $nicetabs_ref ) = @_;
my $std_fh = *STDOUT;
my @multiline_cmd = ();
while ( defined ( my $command = $term_ref->readline($prompt_string)) ) {
## quit (^D also works)
#
if ( $command =~ /^(quit|exit)\W*/i ) {
exit 0;
## should be ctrl-c, but need to hijack $SIG{INT}
#
} elsif ( $command =~ /^clear$/i ) {
@multiline_cmd = ();
## reproduce DESCRIBE sqlplus command
# add table column headers for tab completion
#
} elsif ( $command =~ /^des(c|cr|cri|crib|cribe)\s+(.*)$/i ) {
my @user_tables = &load_usertables( $dbh_ref );
my $desc_stuff = $2;
$desc_stuff =~ s/;\s*$//;
my @arguments = split /\s+/ , $desc_stuff;
foreach my $this_argument ( @arguments ) {
last if ( $this_argument eq ';' );
my ( $display_desc , @desc_return ) = &desc_table( $dbh_ref , $this_argument );
push @{$$nicetabs_ref{'usr_colmn'}} , @desc_return;
&load_completion( $term , $nicetabs_ref );
if ( @arguments > 1 ) {
print "\n$this_argument:";
}
print "$display_desc";
}
## any line that contains a semicolon will be executed (anything after the semicolon is ignored)
#
} elsif ( $command =~ /;/ ) {
## strip semicolon and anything after
#
# $command =~ s/;.*$//;
my $output_fh;
my $first_part;
my $last_part;
$command =~ m/^([^;]*);\s*\|?(.*)/;
$first_part = $1;
$last_part = $2;
if ( length($last_part) > 0 ) {
# print "At last: $last_part\n";
open( SHELL , "|$last_part" );
$output_fh = \*SHELL;
} else {
$output_fh = $std_fh;
}
# my @command_parts = split /;/ , $command;
# foreach my $this_part ( @command_parts ) { print "part: $this_part\n"; }
# my $part_one = $command_parts[0];
# $command =~ s/;.*$//;
my $full_cmd;
if ( @multiline_cmd > 0 ) {
push @multiline_cmd , $first_part;
my $display_multiline_cmd = join "\n " , @multiline_cmd;
print "\n $display_multiline_cmd\n";
$full_cmd = join ' ' , @multiline_cmd;
$full_cmd =~ s/^\s+//;
$full_cmd =~ s/\s+$//;
$full_cmd =~ s/\s+/ /g;
$term->addhistory("$full_cmd;");
@multiline_cmd = ();
} else {
$full_cmd = $first_part;
}
my ( $result_ref , $result_columninfo_ref ) = &run_sql_command( $dbh_ref , $full_cmd );
if ( ( ref($result_ref) eq 'ARRAY' ) and ( ref($result_columninfo_ref) eq 'ARRAY' ) ) {
my $result_out = &format_result( $result_ref , $result_columninfo_ref );
print $output_fh "$result_out";
# print "$result_out";
if ( $output_fh ne $std_fh ) {
print "closing\n";
close $output_fh;
}
} else {
if ( $debug ) { print "\$result_ref: $result_ref\n"; }
}
## anything else is considered part of a multiline command
#
} else {
if ( $command ne "\n" ) {
push @multiline_cmd , $command;
}
}
## show the buffer if anything is in it
#
if ( @multiline_cmd > 0 ) {
my $display_multiline_cmd = join "\n " , @multiline_cmd;
print "\n $display_multiline_cmd\n";
}
}
}