Class: Pod4::PgInterface
- Includes:
- SQLHelper
- Defined in:
- lib/pod4/pg_interface.rb
Overview
Pod4 Interface for requests on a SQL table via pg, the PostgresQL adapter.
If your DB table is one-one with your model, you shouldn’t need to override anything. Example:
class CustomerInterface < SwingShift::PgInterface
set_schema :public # optional
set_table :customer
set_id_fld :id
end
Constant Summary
Constants inherited from Interface
Instance Attribute Summary collapse
-
#id_fld ⇒ Object
readonly
Returns the value of attribute id_fld.
Class Method Summary collapse
- .id_fld ⇒ Object
- .schema ⇒ Object
-
.set_id_fld(idFld) ⇒ Object
Set the name of the column that holds the unique id for the table.
-
.set_schema(schema) ⇒ Object
Set the name of the schema.
-
.set_table(table) ⇒ Object
Set the name of the database table.
- .table ⇒ Object
Instance Method Summary collapse
-
#create(record) ⇒ Object
Record is a hash of field: value.
-
#delete(id) ⇒ Object
ID is whatever you set in the interface using set_id_fld.
-
#execute(sql) ⇒ Object
Run SQL code on the server; return true or false for success or failure.
-
#executep(sql, *vals) ⇒ Object
Run SQL code on the server as per execute() but with parameter insertion.
-
#initialize(connectHash, testClient = nil) ⇒ PgInterface
constructor
Initialise the interface by passing it a Pg connection hash.
- #list(selection = nil) ⇒ Object
-
#read(id) ⇒ Object
ID corresponds to whatever you set in set_id_fld.
- #schema ⇒ Object
-
#select(sql) ⇒ Object
Run SQL code on the server.
-
#selectp(sql, *vals) ⇒ Object
Run SQL code on the server as per select() but with parameter insertion.
- #table ⇒ Object
-
#update(id, record) ⇒ Object
ID is whatever you set in the interface using set_id_fld record should be a Hash or Octothorpe.
Methods included from SQLHelper
Methods included from Metaxing
#define_class_method, #metaclass
Constructor Details
#initialize(connectHash, testClient = nil) ⇒ PgInterface
Initialise the interface by passing it a Pg connection hash. For testing ONLY you can also pass an object which pretends to be a Pg client, in which case the hash is pretty much ignored.
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# File 'lib/pod4/pg_interface.rb', line 80 def initialize(connectHash, testClient=nil) raise(ArgumentError, 'invalid connection hash') unless connectHash.kind_of?(Hash) @connect_hash = connectHash.dup @test_client = testClient @client = nil rescue => e handle_error(e) end |
Instance Attribute Details
#id_fld ⇒ Object (readonly)
Returns the value of attribute id_fld.
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# File 'lib/pod4/pg_interface.rb', line 29 def id_fld @id_fld end |
Class Method Details
.id_fld ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 67 def id_fld raise Pod4Error, "You need to use set_id_fld to set the ID column" end |
.schema ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 45 def schema; nil; end |
.set_id_fld(idFld) ⇒ Object
Set the name of the column that holds the unique id for the table.
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# File 'lib/pod4/pg_interface.rb', line 63 def set_id_fld(idFld) define_class_method(:id_fld) {idFld.to_s.to_sym} end |
.set_schema(schema) ⇒ Object
Set the name of the schema. This is optional.
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# File 'lib/pod4/pg_interface.rb', line 41 def set_schema(schema) define_class_method(:schema) {schema.to_s.to_sym} end |
.set_table(table) ⇒ Object
Set the name of the database table
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# File 'lib/pod4/pg_interface.rb', line 51 def set_table(table) define_class_method(:table) {table.to_s.to_sym} end |
.table ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 55 def table raise Pod4Error, "You need to use set_table to set the table name" end |
Instance Method Details
#create(record) ⇒ Object
Record is a hash of field: value
By a happy coincidence, insert returns the unique ID for the record, which is just what we want to do, too.
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# File 'lib/pod4/pg_interface.rb', line 117 def create(record) raise(ArgumentError, "Bad type for record parameter") \ unless record.kind_of?(Hash) || record.kind_of?(Octothorpe) sql, vals = sql_insert(record) x = selectp(sql, *vals) x.first[id_fld] rescue => e handle_error(e) end |
#delete(id) ⇒ Object
ID is whatever you set in the interface using set_id_fld
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# File 'lib/pod4/pg_interface.rb', line 173 def delete(id) read_or_die(id) sql, vals = sql_delete(id_fld => id) executep(sql, *vals) self rescue => e handle_error(e) end |
#execute(sql) ⇒ Object
Run SQL code on the server; return true or false for success or failure
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# File 'lib/pod4/pg_interface.rb', line 271 def execute(sql) raise(ArgumentError, "Bad SQL parameter") unless sql.kind_of?(String) ensure_connection Pod4.logger.debug(__FILE__){ "execute: #{sql}" } @client.exec(sql) rescue => e handle_error(e) end |
#executep(sql, *vals) ⇒ Object
Run SQL code on the server as per execute() but with parameter insertion.
Placeholders in the SQL string should all be %s as per sql_helper methods. Values should be as returned by sql_helper methods.
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# File 'lib/pod4/pg_interface.rb', line 290 def executep(sql, *vals) raise(ArgumentError, "Bad SQL parameter") unless sql.kind_of?(String) ensure_connection Pod4.logger.debug(__FILE__){ "parameterised execute: #{sql}" } @client.exec_params( *parse_for_params(sql, vals) ) rescue => e handle_error(e) end |
#list(selection = nil) ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 99 def list(selection=nil) raise(ArgumentError, 'selection parameter is not a hash') \ unless selection.nil? || selection.respond_to?(:keys) sql, vals = sql_select(nil, selection) selectp(sql, *vals) {|r| Octothorpe.new(r) } rescue => e handle_error(e) end |
#read(id) ⇒ Object
ID corresponds to whatever you set in set_id_fld
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# File 'lib/pod4/pg_interface.rb', line 133 def read(id) raise(ArgumentError, "ID parameter is nil") if id.nil? sql, vals = sql_select(nil, id_fld => id) rows = selectp(sql, *vals) Octothorpe.new(rows.first) rescue => e # Select has already wrapped the error in a Pod4Error, but in this case we want to catch # something raise CantContinue, "That doesn't look like an ID" \ if e.cause.class == PG::InvalidTextRepresentation handle_error(e) end |
#schema ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 92 def schema; self.class.schema; end |
#select(sql) ⇒ Object
Run SQL code on the server. Return the results.
Will return an array of records, or you can use it in block mode, like this:
select("select * from customer") do |r|
# r is a single record
end
The returned results will be an array of hashes (or if you passed a block, of whatever you returned from the block).
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# File 'lib/pod4/pg_interface.rb', line 198 def select(sql) raise(ArgumentError, "Bad SQL parameter") unless sql.kind_of?(String) ensure_connection Pod4.logger.debug(__FILE__){ "select: #{sql}" } rows = [] @client.exec(sql) do |query| oids = make_oid_hash(query) query.each do |r| row = cast_row_fudge(r, oids) if block_given? rows << yield(row) else rows << row end end end @client.cancel rows rescue => e handle_error(e) end |
#selectp(sql, *vals) ⇒ Object
Run SQL code on the server as per select() but with parameter insertion.
Placeholders in the SQL string should all be %s as per sql_helper methods. Values should be as returned by sql_helper methods.
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# File 'lib/pod4/pg_interface.rb', line 236 def selectp(sql, *vals) raise(ArgumentError, "Bad SQL parameter") unless sql.kind_of?(String) ensure_connection Pod4.logger.debug(__FILE__){ "select: #{sql} #{vals.inspect}" } rows = [] @client.exec_params( *parse_for_params(sql, vals) ) do |query| oids = make_oid_hash(query) query.each do |r| row = cast_row_fudge(r, oids) if block_given? rows << yield(row) else rows << row end end end @client.cancel rows rescue => e handle_error(e) end |
#table ⇒ Object
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# File 'lib/pod4/pg_interface.rb', line 93 def table; self.class.table; end |
#update(id, record) ⇒ Object
ID is whatever you set in the interface using set_id_fld record should be a Hash or Octothorpe.
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# File 'lib/pod4/pg_interface.rb', line 154 def update(id, record) raise(ArgumentError, "Bad type for record parameter") \ unless record.kind_of?(Hash) || record.kind_of?(Octothorpe) read_or_die(id) sql, vals = sql_update(record, id_fld => id) executep(sql, *vals) self rescue => e handle_error(e) end |