Class: DBI::DBD::SQLite::Statement

Inherits:
BaseStatement show all
Defined in:
lib/dbd/sqlite/statement.rb

Overview

See DBI::BaseStatement.

Constant Summary

DBI_TYPE_MAP =
[
    [ /^INT(EGER)?$/i,          DBI::SQL_INTEGER ],
    [ /^(OID|ROWID|_ROWID_)$/i, DBI::SQL_OTHER   ],
    [ /^FLOAT$/i,               DBI::SQL_FLOAT   ],
    [ /^REAL$/i,                DBI::SQL_REAL    ],
    [ /^DOUBLE$/i,              DBI::SQL_DOUBLE  ],
    [ /^DECIMAL/i,              DBI::SQL_DECIMAL ],
    [ /^(BOOL|BOOLEAN)$/i,      DBI::SQL_BOOLEAN ], 
    [ /^TIME$/i,                DBI::SQL_TIME    ],
    [ /^DATE$/i,                DBI::SQL_DATE    ],
    [ /^TIMESTAMP$/i,           DBI::SQL_TIMESTAMP ], 
    [ /^(VARCHAR|TEXT)/i,       DBI::SQL_VARCHAR ],
    [ /^CHAR$/i,                DBI::SQL_CHAR    ],
]

Instance Attribute Summary

Attributes inherited from BaseStatement

#raise_error

Instance Method Summary collapse

Methods inherited from BaseStatement

#[], #[]=, #bind_params, #cancel, #fetch_all, #fetch_many, #fetch_scroll

Constructor Details

#initialize(stmt, dbh) ⇒ Statement



20
21
22
23
24
25
26
27
28
# File 'lib/dbd/sqlite/statement.rb', line 20

def initialize(stmt, dbh)
    @dbh       = dbh
    @statement = DBI::SQL::PreparedStatement.new(@dbh, stmt)
    @attr      = { }
    @params    = [ ]
    @rows      = [ ]
    @result_set = nil
    @dbh.open_handles += 1
end

Instance Method Details

#bind_param(param, value, attributes = nil) ⇒ Object

See DBI::BaseStatement#bind_param. This method will also raise DBI::InterfaceError if param is not a Fixnum, to prevent incorrect binding.



35
36
37
38
39
40
41
42
43
# File 'lib/dbd/sqlite/statement.rb', line 35

def bind_param(param, value, attributes=nil)
    unless param.kind_of? Fixnum
        raise DBI::InterfaceError, "Only numeric parameters are supported"
    end

    @params[param-1] = value

    # FIXME what to do with attributes? are they important in SQLite?
end

#column_infoObject



89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
# File 'lib/dbd/sqlite/statement.rb', line 89

def column_info
    columns = [ ]

    # FIXME this shit should *really* be abstracted into DBI
    # FIXME this still doesn't handle nullable/unique/default stuff.
    @result_set.columns.each_with_index do |name, i|
        columns[i] = { } unless columns[i]
        columns[i]["name"] = name
        type_name = @result_set.types[i]

        if type_name
            m = DBI::DBD::SQLite.parse_type(type_name)

            columns[i]["type_name"] = m[1]
            columns[i]["precision"] = m[3].to_i if m[3]
            columns[i]["scale"]     = m[5].to_i if m[5]
            DBI_TYPE_MAP.each do |map|
                if columns[i]["type_name"] =~ map[0]
                    columns[i]["sql_type"] = map[1]
                    break
                end
            end

            case columns[i]["type_name"]
            when 'double'
                columns[i]["dbi_type"] = DBI::Type::Float
            end
        end
    end

    return columns
end

#executeObject

See DBI::BaseStatement#execute.

In the event AutoCommit is off and no transaction is currently executing, one will be opened at this point. It is your responsibility to #finish, #cancel, #rollback, or #commit.



52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
# File 'lib/dbd/sqlite/statement.rb', line 52

def execute
    sql = @statement.bind(@params)
    # XXX sqlite re-escapes this for us automatically, it's causing trouble with everything else.
    #     this will probably break in a horrible manner and I will be forced to "fix" it again.
    sql.gsub!(/\\\\/) { '\\' } 
    DBI::DBD::SQLite.check_sql(sql)

    begin
        unless @dbh.db.transaction_active?
            @dbh.db.transaction 
        end
        @result_set = @dbh.db.query(sql)
        @dbh.commit if @dbh["AutoCommit"]
    rescue Exception => e
        raise DBI::DatabaseError, e.message
    end
end

#fetchObject



80
81
82
83
84
85
86
87
# File 'lib/dbd/sqlite/statement.rb', line 80

def fetch
    return nil if @result_set.eof?

    row = @result_set.next
    return nil unless row

    return row
end

#rowsObject



122
123
124
# File 'lib/dbd/sqlite/statement.rb', line 122

def rows
    return @dbh.db.changes
end