Move query result helper class to maxsql
Added some asserts to ensure the class is used correctly.
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@ -16,7 +16,7 @@
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#include <string>
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#include <vector>
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#include <maxbase/stopwatch.hh>
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#include <maxscale/mysql_utils.hh>
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#include <maxscale/server.hh>
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class MariaDBServer;
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@ -240,84 +240,3 @@ public:
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ServerOperation(MariaDBServer* target, bool was_is_master, bool handle_events,
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const std::string& sql_file, const SlaveStatusArray& conns_to_copy);
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};
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/**
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* Helper class for simplifying working with resultsets. Used in MariaDBServer.
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*/
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class QueryResult
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{
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// These need to be banned to avoid premature destruction.
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QueryResult(const QueryResult&) = delete;
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QueryResult& operator=(const QueryResult&) = delete;
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public:
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QueryResult(MYSQL_RES* resultset = NULL);
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~QueryResult();
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/**
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* Advance to next row. Affects all result returning functions.
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*
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* @return True if the next row has data, false if the current row was the last one.
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*/
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bool next_row();
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/**
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* Get the index of the current row.
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*
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* @return Current row index, or -1 if no data or next_row() has not been called yet.
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*/
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int64_t get_current_row_index() const;
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/**
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* How many columns the result set has.
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*
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* @return Column count, or -1 if no data.
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*/
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int64_t get_col_count() const;
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/**
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* How many rows does the result set have?
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*
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* @return The number of rows or -1 on error
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*/
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int64_t get_row_count() const;
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/**
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* Get a numeric index for a column name. May give wrong results if column names are not unique.
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*
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* @param col_name Column name
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* @return Index or -1 if not found.
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*/
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int64_t get_col_index(const std::string& col_name) const;
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/**
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* Read a string value from the current row and given column. Empty string and (null) are both interpreted
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* as the empty string.
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*
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* @param column_ind Column index
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* @return Value as string
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*/
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std::string get_string(int64_t column_ind) const;
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/**
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* Read a non-negative integer value from the current row and given column.
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*
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* @param column_ind Column index
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* @return Value as integer. 0 or greater indicates success, -1 is returned on error.
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*/
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int64_t get_uint(int64_t column_ind) const;
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/**
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* Read a boolean value from the current row and given column.
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*
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* @param column_ind Column index
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* @return Value as boolean. Returns true if the text is either 'Y' or '1'.
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*/
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bool get_bool(int64_t column_ind) const;
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private:
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MYSQL_RES* m_resultset = NULL; // Underlying result set, freed at dtor.
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std::unordered_map<std::string, int64_t> m_col_indexes; // Map of column name -> index
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MYSQL_ROW m_rowdata = NULL; // Data for current row
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int64_t m_current_row_ind = -1;// Index of current row
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};
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