class Marten::DB::Connection::MySQL

Defined in:

marten/db/connection/mysql.cr

Instance Method Summary

Instance methods inherited from class Marten::DB::Connection::Base

alias : String alias, build_sql(&) build_sql, distinct_clause_for(columns : Array(String)) : String distinct_clause_for, id : String id, insert(table_name : String, values : Hash(String, ::DB::Any), pk_field_to_fetch : String | Nil = nil) : ::DB::Any insert, left_operand_for(id : String, predicate) : String left_operand_for, limit_value(value : Int | Nil) : Int32 | Int64 | Nil | UInt32 | UInt64 limit_value, max_name_size : Int32 max_name_size, observe_transaction_commit(block : -> Nil) observe_transaction_commit, observe_transaction_rollback(block : -> Nil) observe_transaction_rollback, open(&) open, operator_for(predicate) : String operator_for, parameter_id_for_ordered_argument(number : Int) : String parameter_id_for_ordered_argument, quote(name : String | Symbol) : String quote, quote_char : Char quote_char, sanitize_like_pattern(pattern : String) : String sanitize_like_pattern, scheme : String scheme, test_database? test_database?, transaction(&) transaction, update(table_name : String, values : Hash(String, ::DB::Any), pk_column_name : String, pk_value : ::DB::Any) : Nil update

Constructor methods inherited from class Marten::DB::Connection::Base

new(config : Conf::GlobalSettings::Database) new

Instance Method Detail

def distinct_clause_for(columns : Array(String)) : String #
Description copied from class Marten::DB::Connection::Base

Returns a distinct clause to remove duplicates from a query's results.

If column names are specified, only these specific columns will be checked to identify duplicates.


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def insert(table_name : String, values : Hash(String, ::DB::Any), pk_field_to_fetch : String | Nil = nil) : ::DB::Any #
Description copied from class Marten::DB::Connection::Base

Allows to insert a new row in a specific table.


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def left_operand_for(id : String, predicate) : String #
Description copied from class Marten::DB::Connection::Base

Returns the left operand to use for specific query predicate.

Most of the time the initial ID will be left intact but depending on the connection implementation and the considered predicate type (eg. "istartswith"), specific SQL functions could be applied on the column ID.


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def limit_value(value : Int | Nil) : Int32 | Int64 | Nil | UInt32 | UInt64 #
Description copied from class Marten::DB::Connection::Base

Returns a compatible value to use in the context of a LIMIT statement for the database at hand.


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def max_name_size : Int32 #
Description copied from class Marten::DB::Connection::Base

Returns the maximum size for table names, column names or index / constraint names.


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def operator_for(predicate) : String #
Description copied from class Marten::DB::Connection::Base

Returns the operator to use for a specific query predicate.


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def parameter_id_for_ordered_argument(number : Int) : String #
Description copied from class Marten::DB::Connection::Base

Returns the parameterized identifier for an ordered argument.

This method takes the number of the argument which is aimed to be part of an array of ordered SQL arguments.


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def quote_char : Char #
Description copied from class Marten::DB::Connection::Base

Returns the quote character to use to quote table names, columns, etc.


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def scheme : String #
Description copied from class Marten::DB::Connection::Base

Returns the scheme to consider for the underlying database backend.


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def update(table_name : String, values : Hash(String, ::DB::Any), pk_column_name : String, pk_value : ::DB::Any) : Nil #
Description copied from class Marten::DB::Connection::Base

Allows to update an existing row in a specific table.


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