Move query result helper class to maxsql
Added some asserts to ensure the class is used correctly.
This commit is contained in:
@ -15,6 +15,7 @@
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#include <maxscale/ccdefs.hh>
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#include <maxscale/ccdefs.hh>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdint.h>
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#include <maxsql/mariadb.hh>
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#include <maxscale/protocol/mysql.hh>
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#include <maxscale/protocol/mysql.hh>
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#include <maxscale/server.hh>
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#include <maxscale/server.hh>
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@ -123,4 +124,21 @@ mxs_mysql_name_kind_t mxs_mysql_name_to_pcre(char* pcre,
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*/
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*/
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void mxs_mysql_update_server_version(SERVER* dest, MYSQL* source);
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void mxs_mysql_update_server_version(SERVER* dest, MYSQL* source);
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namespace maxscale
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{
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/**
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* Execute a query which returns data. The results are returned as a unique pointer to a QueryResult
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* object. The column names of the results are assumed unique.
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*
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* @param conn Server connection
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* @param query The query
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* @param errmsg_out Where to store an error message if query fails. Can be null.
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* @return Pointer to query results, or an empty pointer on failure
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*/
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std::unique_ptr<mxq::QueryResult> execute_query(MYSQL* conn, const std::string& query,
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std::string* errmsg_out = NULL);
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}
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MXS_END_DECLS
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MXS_END_DECLS
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@ -14,6 +14,7 @@
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#include <maxsql/ccdefs.hh>
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#include <maxsql/ccdefs.hh>
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#include <string>
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#include <string>
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#include <unordered_map>
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#include <mysql.h>
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#include <mysql.h>
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namespace maxsql
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namespace maxsql
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@ -51,4 +52,91 @@ void mysql_set_log_statements(bool enable);
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* @return True, if statements are logged, false otherwise.
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* @return True, if statements are logged, false otherwise.
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*/
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*/
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bool mysql_get_log_statements();
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bool mysql_get_log_statements();
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/**
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* Helper class for simplifying working with resultsets.
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*/
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class QueryResult
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{
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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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/**
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* Construct a new resultset.
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*
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* @param resultset The results from mysql_query(). Must not be NULL.
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*/
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QueryResult(MYSQL_RES* resultset);
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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 next_row() has not been called yet or all rows have been processed.
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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
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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
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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 if the data
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* could not be parsed or the result was negative.
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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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}
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}
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@ -13,8 +13,11 @@
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#include <maxsql/mariadb.hh>
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#include <maxsql/mariadb.hh>
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#include <time.h>
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#include <time.h>
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#include <errmsg.h>
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#include <errmsg.h>
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#include <string>
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#include <string.h>
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#include <maxbase/assert.h>
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#include <maxbase/assert.h>
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using std::string;
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namespace
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namespace
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{
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{
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@ -84,4 +87,95 @@ bool mysql_get_log_statements()
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{
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{
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return this_unit.log_statements;
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return this_unit.log_statements;
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}
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}
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QueryResult::QueryResult(MYSQL_RES* resultset)
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: m_resultset(resultset)
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{
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mxb_assert(m_resultset);
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auto columns = mysql_num_fields(m_resultset);
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MYSQL_FIELD* field_info = mysql_fetch_fields(m_resultset);
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for (int64_t column_index = 0; column_index < columns; column_index++)
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{
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string key(field_info[column_index].name);
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// TODO: Think of a way to handle duplicate names nicely. Currently this should only be used
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// for known queries.
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mxb_assert(m_col_indexes.count(key) == 0);
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m_col_indexes[key] = column_index;
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}
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}
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QueryResult::~QueryResult()
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{
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mxb_assert(m_resultset);
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mysql_free_result(m_resultset);
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}
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bool QueryResult::next_row()
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{
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m_rowdata = mysql_fetch_row(m_resultset);
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if (m_rowdata)
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{
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m_current_row_ind++;
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return true;
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}
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else
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{
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m_current_row_ind = -1;
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return false;
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}
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}
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int64_t QueryResult::get_current_row_index() const
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{
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return m_current_row_ind;
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}
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int64_t QueryResult::get_col_count() const
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{
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return mysql_num_fields(m_resultset);
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}
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int64_t QueryResult::get_row_count() const
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{
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return mysql_num_rows(m_resultset);
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}
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int64_t QueryResult::get_col_index(const string& col_name) const
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{
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auto iter = m_col_indexes.find(col_name);
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return (iter != m_col_indexes.end()) ? iter->second : -1;
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}
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string QueryResult::get_string(int64_t column_ind) const
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{
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mxb_assert(column_ind < get_col_count() && column_ind >= 0 && m_rowdata);
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char* data = m_rowdata[column_ind];
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return data ? data : "";
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}
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int64_t QueryResult::get_uint(int64_t column_ind) const
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{
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mxb_assert(column_ind < get_col_count() && column_ind >= 0 && m_rowdata);
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char* data = m_rowdata[column_ind];
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int64_t rval = -1;
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if (data && *data)
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{
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errno = 0; // strtoll sets this
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char* endptr = NULL;
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auto parsed = strtoll(data, &endptr, 10);
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if (parsed >= 0 && errno == 0 && *endptr == '\0')
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{
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rval = parsed;
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}
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}
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return rval;
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}
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bool QueryResult::get_bool(int64_t column_ind) const
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{
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mxb_assert(column_ind < get_col_count() && column_ind >= 0 && m_rowdata);
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char* data = m_rowdata[column_ind];
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return data ? (strcmp(data, "Y") == 0 || strcmp(data, "1") == 0) : false;
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}
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}
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}
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@ -27,10 +27,11 @@
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#include <stdbool.h>
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#include <stdbool.h>
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#include <errmsg.h>
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#include <errmsg.h>
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#include <maxbase/atomic.hh>
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#include <maxbase/format.hh>
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#include <maxsql/mariadb.hh>
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#include <maxsql/mariadb.hh>
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#include <maxscale/alloc.h>
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#include <maxscale/alloc.h>
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#include <maxscale/config.hh>
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#include <maxscale/config.hh>
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#include <maxbase/atomic.hh>
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/**
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/**
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* @brief Calculate the length of a length-encoded integer in bytes
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* @brief Calculate the length of a length-encoded integer in bytes
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@ -358,3 +359,25 @@ void mxs_mysql_update_server_version(SERVER* dest, MYSQL* source)
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mxb_assert(version_string != NULL && version_num != 0);
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mxb_assert(version_string != NULL && version_num != 0);
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dest->set_version(version_num, version_string);
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dest->set_version(version_num, version_string);
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}
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}
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namespace maxscale
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{
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std::unique_ptr<mxq::QueryResult> execute_query(MYSQL* conn, const std::string& query,
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std::string* errmsg_out)
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{
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using mxq::QueryResult;
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std::unique_ptr<QueryResult> rval;
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MYSQL_RES* result = NULL;
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if (mxs_mysql_query(conn, query.c_str()) == 0 && (result = mysql_store_result(conn)) != NULL)
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{
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rval = std::unique_ptr<QueryResult>(new QueryResult(result));
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}
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else if (errmsg_out)
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{
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*errmsg_out = mxb::string_printf("Query '%s' failed: '%s'.", query.c_str(), mysql_error(conn));
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}
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return rval;
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}
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}
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@ -22,11 +22,11 @@
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#include <maxsql/mariadb.hh>
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#include <maxsql/mariadb.hh>
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#include <maxscale/mysql_utils.hh>
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#include <maxscale/mysql_utils.hh>
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using std::string;
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using std::string;
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using maxbase::string_printf;
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using maxbase::string_printf;
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using maxbase::Duration;
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using maxbase::Duration;
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using maxbase::StopWatch;
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using maxbase::StopWatch;
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using maxsql::QueryResult;
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class MariaDBServer::EventInfo
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class MariaDBServer::EventInfo
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{
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{
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@ -82,18 +82,7 @@ uint64_t MariaDBServer::relay_log_events(const SlaveStatus& slave_conn)
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std::unique_ptr<QueryResult> MariaDBServer::execute_query(const string& query, std::string* errmsg_out)
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std::unique_ptr<QueryResult> MariaDBServer::execute_query(const string& query, std::string* errmsg_out)
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{
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{
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auto conn = m_server_base->con;
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return maxscale::execute_query(m_server_base->con, query, errmsg_out);
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std::unique_ptr<QueryResult> rval;
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MYSQL_RES* result = NULL;
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if (mxs_mysql_query(conn, query.c_str()) == 0 && (result = mysql_store_result(conn)) != NULL)
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{
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rval = std::unique_ptr<QueryResult>(new QueryResult(result));
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}
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else if (errmsg_out)
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{
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*errmsg_out = string_printf("Query '%s' failed: '%s'.", query.c_str(), mysql_error(conn));
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}
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return rval;
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}
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}
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/**
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/**
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@ -15,11 +15,11 @@
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#include <functional>
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#include <functional>
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#include <string>
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#include <string>
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#include <memory>
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#include <memory>
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#include <maxscale/monitor.hh>
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#include <maxbase/stopwatch.hh>
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#include <maxbase/stopwatch.hh>
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#include <maxsql/mariadb.hh>
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#include <maxscale/monitor.hh>
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#include "server_utils.hh"
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#include "server_utils.hh"
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class QueryResult;
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class MariaDBServer;
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class MariaDBServer;
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// Server pointer array
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// Server pointer array
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typedef std::vector<MariaDBServer*> ServerArray;
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typedef std::vector<MariaDBServer*> ServerArray;
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@ -187,7 +187,7 @@ public:
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* @param errmsg_out Where to store an error message if query fails. Can be null.
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* @param errmsg_out Where to store an error message if query fails. Can be null.
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* @return Pointer to query results, or an empty pointer on failure
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* @return Pointer to query results, or an empty pointer on failure
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*/
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*/
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std::unique_ptr<QueryResult> execute_query(const std::string& query, std::string* errmsg_out = NULL);
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std::unique_ptr<mxq::QueryResult> execute_query(const std::string& query, std::string* errmsg_out = NULL);
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|
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/**
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/**
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* execute_cmd_ex with query retry ON.
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* execute_cmd_ex with query retry ON.
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|
@ -405,94 +405,3 @@ Gtid GtidList::get_gtid(uint32_t domain) const
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}
|
}
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return rval;
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return rval;
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}
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}
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QueryResult::QueryResult(MYSQL_RES* resultset)
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: m_resultset(resultset)
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{
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if (m_resultset)
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|
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{
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auto columns = mysql_num_fields(m_resultset);
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MYSQL_FIELD* field_info = mysql_fetch_fields(m_resultset);
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|
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for (int64_t column_index = 0; column_index < columns; column_index++)
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|
||||||
{
|
|
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string key(field_info[column_index].name);
|
|
||||||
// TODO: Think of a way to handle duplicate names nicely. Currently this should only be used
|
|
||||||
// for known queries.
|
|
||||||
mxb_assert(m_col_indexes.count(key) == 0);
|
|
||||||
m_col_indexes[key] = column_index;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
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||||||
QueryResult::~QueryResult()
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|
||||||
{
|
|
||||||
if (m_resultset)
|
|
||||||
{
|
|
||||||
mysql_free_result(m_resultset);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
bool QueryResult::next_row()
|
|
||||||
{
|
|
||||||
mxb_assert(m_resultset);
|
|
||||||
m_rowdata = mysql_fetch_row(m_resultset);
|
|
||||||
if (m_rowdata)
|
|
||||||
{
|
|
||||||
m_current_row_ind++;
|
|
||||||
return true;
|
|
||||||
}
|
|
||||||
return false;
|
|
||||||
}
|
|
||||||
|
|
||||||
int64_t QueryResult::get_current_row_index() const
|
|
||||||
{
|
|
||||||
return m_current_row_ind;
|
|
||||||
}
|
|
||||||
|
|
||||||
int64_t QueryResult::get_col_count() const
|
|
||||||
{
|
|
||||||
return m_resultset ? mysql_num_fields(m_resultset) : -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
int64_t QueryResult::get_row_count() const
|
|
||||||
{
|
|
||||||
return m_resultset ? mysql_num_rows(m_resultset) : -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
int64_t QueryResult::get_col_index(const string& col_name) const
|
|
||||||
{
|
|
||||||
auto iter = m_col_indexes.find(col_name);
|
|
||||||
return (iter != m_col_indexes.end()) ? iter->second : -1;
|
|
||||||
}
|
|
||||||
|
|
||||||
string QueryResult::get_string(int64_t column_ind) const
|
|
||||||
{
|
|
||||||
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
|
|
||||||
char* data = m_rowdata[column_ind];
|
|
||||||
return data ? data : "";
|
|
||||||
}
|
|
||||||
|
|
||||||
int64_t QueryResult::get_uint(int64_t column_ind) const
|
|
||||||
{
|
|
||||||
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
|
|
||||||
char* data = m_rowdata[column_ind];
|
|
||||||
int64_t rval = -1;
|
|
||||||
if (data && *data)
|
|
||||||
{
|
|
||||||
errno = 0; // strtoll sets this
|
|
||||||
char* endptr = NULL;
|
|
||||||
auto parsed = strtoll(data, &endptr, 10);
|
|
||||||
if (parsed >= 0 && errno == 0 && *endptr == '\0')
|
|
||||||
{
|
|
||||||
rval = parsed;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
return rval;
|
|
||||||
}
|
|
||||||
|
|
||||||
bool QueryResult::get_bool(int64_t column_ind) const
|
|
||||||
{
|
|
||||||
mxb_assert(column_ind < get_col_count() && column_ind >= 0);
|
|
||||||
char* data = m_rowdata[column_ind];
|
|
||||||
return data ? (strcmp(data, "Y") == 0 || strcmp(data, "1") == 0) : false;
|
|
||||||
}
|
|
||||||
|
@ -16,7 +16,7 @@
|
|||||||
#include <string>
|
#include <string>
|
||||||
#include <vector>
|
#include <vector>
|
||||||
#include <maxbase/stopwatch.hh>
|
#include <maxbase/stopwatch.hh>
|
||||||
#include <maxscale/mysql_utils.hh>
|
#include <maxscale/server.hh>
|
||||||
|
|
||||||
class MariaDBServer;
|
class MariaDBServer;
|
||||||
|
|
||||||
@ -240,84 +240,3 @@ public:
|
|||||||
ServerOperation(MariaDBServer* target, bool was_is_master, bool handle_events,
|
ServerOperation(MariaDBServer* target, bool was_is_master, bool handle_events,
|
||||||
const std::string& sql_file, const SlaveStatusArray& conns_to_copy);
|
const std::string& sql_file, const SlaveStatusArray& conns_to_copy);
|
||||||
};
|
};
|
||||||
|
|
||||||
/**
|
|
||||||
* Helper class for simplifying working with resultsets. Used in MariaDBServer.
|
|
||||||
*/
|
|
||||||
class QueryResult
|
|
||||||
{
|
|
||||||
// These need to be banned to avoid premature destruction.
|
|
||||||
QueryResult(const QueryResult&) = delete;
|
|
||||||
QueryResult& operator=(const QueryResult&) = delete;
|
|
||||||
|
|
||||||
public:
|
|
||||||
QueryResult(MYSQL_RES* resultset = NULL);
|
|
||||||
~QueryResult();
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Advance to next row. Affects all result returning functions.
|
|
||||||
*
|
|
||||||
* @return True if the next row has data, false if the current row was the last one.
|
|
||||||
*/
|
|
||||||
bool next_row();
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Get the index of the current row.
|
|
||||||
*
|
|
||||||
* @return Current row index, or -1 if no data or next_row() has not been called yet.
|
|
||||||
*/
|
|
||||||
int64_t get_current_row_index() const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* How many columns the result set has.
|
|
||||||
*
|
|
||||||
* @return Column count, or -1 if no data.
|
|
||||||
*/
|
|
||||||
int64_t get_col_count() const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* How many rows does the result set have?
|
|
||||||
*
|
|
||||||
* @return The number of rows or -1 on error
|
|
||||||
*/
|
|
||||||
int64_t get_row_count() const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Get a numeric index for a column name. May give wrong results if column names are not unique.
|
|
||||||
*
|
|
||||||
* @param col_name Column name
|
|
||||||
* @return Index or -1 if not found.
|
|
||||||
*/
|
|
||||||
int64_t get_col_index(const std::string& col_name) const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Read a string value from the current row and given column. Empty string and (null) are both interpreted
|
|
||||||
* as the empty string.
|
|
||||||
*
|
|
||||||
* @param column_ind Column index
|
|
||||||
* @return Value as string
|
|
||||||
*/
|
|
||||||
std::string get_string(int64_t column_ind) const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Read a non-negative integer value from the current row and given column.
|
|
||||||
*
|
|
||||||
* @param column_ind Column index
|
|
||||||
* @return Value as integer. 0 or greater indicates success, -1 is returned on error.
|
|
||||||
*/
|
|
||||||
int64_t get_uint(int64_t column_ind) const;
|
|
||||||
|
|
||||||
/**
|
|
||||||
* Read a boolean value from the current row and given column.
|
|
||||||
*
|
|
||||||
* @param column_ind Column index
|
|
||||||
* @return Value as boolean. Returns true if the text is either 'Y' or '1'.
|
|
||||||
*/
|
|
||||||
bool get_bool(int64_t column_ind) const;
|
|
||||||
|
|
||||||
private:
|
|
||||||
MYSQL_RES* m_resultset = NULL; // Underlying result set, freed at dtor.
|
|
||||||
std::unordered_map<std::string, int64_t> m_col_indexes; // Map of column name -> index
|
|
||||||
MYSQL_ROW m_rowdata = NULL; // Data for current row
|
|
||||||
int64_t m_current_row_ind = -1;// Index of current row
|
|
||||||
};
|
|
||||||
|
Reference in New Issue
Block a user