Class: Blazer::Adapters::CassandraAdapter
Instance Attribute Summary
Attributes inherited from BaseAdapter
#data_source
Instance Method Summary
collapse
Methods inherited from BaseAdapter
#cachable?, #cancel, #cost, #explain, #initialize, #reconnect
Instance Method Details
#preview_statement ⇒ Object
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# File 'lib/blazer/adapters/cassandra_adapter.rb', line 29
def preview_statement
"SELECT * FROM {table} LIMIT 10"
end
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#run_statement(statement, comment) ⇒ Object
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# File 'lib/blazer/adapters/cassandra_adapter.rb', line 4
def run_statement(statement, )
columns = []
rows = []
error = nil
begin
response = session.execute("#{statement} /*#{}*/")
rows = response.map { |r| r.values }
columns = rows.any? ? response.first.keys : []
rescue => e
error = e.message
end
[columns, rows, error]
end
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#schema ⇒ Object
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# File 'lib/blazer/adapters/cassandra_adapter.rb', line 24
def schema
result = session.execute("SELECT keyspace_name, table_name, column_name, type, position FROM system_schema.columns WHERE keyspace_name = '#{keyspace}'")
result.map(&:values).group_by { |r| [r[0], r[1]] }.map { |k, vs| {schema: k[0], table: k[1], columns: vs.sort_by { |v| v[2] }.map { |v| {name: v[2], data_type: v[3]} }} }
end
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#tables ⇒ Object
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# File 'lib/blazer/adapters/cassandra_adapter.rb', line 20
def tables
session.execute("SELECT table_name FROM system_schema.tables WHERE keyspace_name = '#{keyspace}'").map { |r| r["table_name"] }
end
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