技术标签: C/C++ c++ Powered by 金山文档
解决问题:
支持BLOB类型CURD(增删改查)
支持特殊字符串类型
安全数据库命令执行
导出函数:
DB2_ExecuteQuery 执行数据库查询
DB2_ExecuteNonQuery 执行数据库命令,返回值:-1、SQL问题/链接故障、0、无数据改变、>= 1 命令影响数据库行数
DB2_FetchAllRows 获取所有行数据
DB2_FetchRowValue 获取行的列数据
DB2_ParameterStatement 参数声明(支持:字符串、BLOB、各种C/C++基础语法值类型)
if (!DB2_ExecuteQuery(m_Mysql, statement, statement_size,
[&](int, MYSQL_RES* results)
{
DB2_FetchAllRows(results,
[results, reply](int, MYSQL_ROW rows)
{
return DB2_FetchRowValue(results, rows, 1, DB2_FetchRowValue<int>(results, rows, 0),
[reply](char* blob_data, int blob_size)
{
reply->add_orders(blob_data, blob_size);
return false;
});
});
}))
{
reply->set_error(PROTO_GS_ERROR_SALTYFISH_FINDORDER_FROM_DATABASESERVER_EXECUTE_QUERY_TSQL_ERROR);
break;
}
if (!DB2_ExecuteQuery(m_Mysql, statement, statement_size,
[&dataPtr](int, MYSQL_RES* results)
{
MYSQL_ROW rows;
while (rows = mysql_fetch_row(results))
{
std::string cdkey = DB2_FetchRowValue<std::string>(results, rows, 0);
if (cdkey.empty())
{
continue;
}
dataPtr->add_account(cdkey);
}
}))
{
LogErr("DBThread::UserLogin mysql_query error");
return NULL;
}
std::string statement = "insert into t_saltyfish(`guid`, `zone_id`, `seller`, `buyer`, `order_data`, `order_size`) value(";
statement += DB2_ParameterStatement(m_Mysql, CDBThread4Read_SaltyFish_Guid(msg->guid())) + ", ";
statement += DB2_ParameterStatement(m_Mysql, g_Config.GetZoneID()) + ", ";
statement += DB2_ParameterStatement(m_Mysql, msg->seller()) + ", ";
statement += DB2_ParameterStatement(m_Mysql, msg->buyer()) + ", ";
statement += DB2_ParameterStatement(m_Mysql, msg->order()) + ", ";
statement += DB2_ParameterStatement(m_Mysql, msg->order().size()) + ");";
DB2_ExecuteNonQuery(m_Mysql, statement);
C/C++ DB2.h 轻量级数据库操作函数封装
#pragma once
#include <string>
#include <memory>
#include "MySqlCpp.h"
#include "DBBase.h"
#include "DBHead.h"
template <typename ExecuteHandler>
inline int DB2_ExecuteStatement(MySql& mysql, const char* statement, int max_statement_size, ExecuteHandler&& handler) noexcept
{
MYSQL* h = mysql.GetConnection();
if (NULL == h)
{
return -1;
}
if (NULL == statement || max_statement_size < 1)
{
return -1;
}
if (mysql_real_query(h, statement, max_statement_size))
{
int err = mysql_errno(h);
if (err == CR_SERVER_GONE_ERROR || err == CR_UNKNOWN_ERROR || err == CR_SERVER_LOST)
{
mysql.CloseConnection();
}
return -1;
}
return handler(h);
}
template <typename ExecuteHandler>
inline bool DB2_ExecuteQuery(MYSQL* mysql, ExecuteHandler&& handler) noexcept
{
if (NULL == mysql)
{
return false;
}
int dataTable = -1;
do
{
// FETCH MORE RESULTS
MYSQL_RES* results = mysql_store_result(mysql);
if (NULL == results)
{
break;
}
// FORWARD
handler(++dataTable, results);
// NOP
MYSQL_ROW rows;
while (rows = mysql_fetch_row(results));
// FREE
mysql_free_result(results);
// NEXT
if (mysql_next_result(mysql)) break;
} while (mysql_more_results(mysql));
return dataTable > -1;
}
template <typename ExecuteHandler>
inline bool DB2_ExecuteQuery(MySql& mysql, const char* statement, int max_statement_size, ExecuteHandler&& handler) noexcept
{
int err = DB2_ExecuteStatement(mysql, statement, max_statement_size,
[&handler](MYSQL* h) noexcept
{
return DB2_ExecuteQuery(h, handler) ? 0 : 1;
});
return err > -1;
}
template <typename ExecuteHandler>
inline bool DB2_ExecuteQuery(MySql& mysql, const std::string& statement, ExecuteHandler&& handler) noexcept
{
return DB2_ExecuteQuery(mysql, statement.data(), statement.size(), handler);
}
inline int DB2_ExecuteNonQuery(MySql& mysql, const char* statement, int max_statement_size) noexcept
{
return DB2_ExecuteStatement(mysql, statement, max_statement_size,
[](MYSQL* h) noexcept
{
return mysql_affected_rows(h);
});
}
inline int DB2_ExecuteNonQuery(MySql& mysql, const std::string& statement) noexcept
{
return DB2_ExecuteNonQuery(mysql, statement.data(), statement.size());
}
inline std::string DB2_ParameterStatement(MySql& mysql, const void* data, int data_size) noexcept
{
MYSQL* h = mysql.GetConnection();
if (NULL == h)
{
return "''";
}
if (NULL == data || data_size < 1)
{
return "''";
}
int buf_size = data_size << 1 + 3;
if (buf_size < 1)
{
return "''";
}
char* buf = (char*)SafeMalloc(buf_size);
if (NULL == buf)
{
return "''";
}
else
{
buf[0] = '\'';
}
int len = mysql_real_escape_string(h, buf + 1, (char*)data, data_size);
if (len < 1)
{
SafeFree(buf);
return "''";
}
else
{
buf[++len] = '\'';
buf[++len] = '\x0';
std::string r = std::string(buf, len);
SafeFree(buf);
return std::move(r);
}
}
template <typename PredicateHandler>
inline MYSQL_ROW DB2_FetchAllRows(MYSQL_RES* results, PredicateHandler&& predicate) noexcept
{
if (NULL == results)
{
return NULL;
}
int rowsindex = 0;
MYSQL_ROW rows = NULL;
while (rows = mysql_fetch_row(results))
{
if (predicate(rowsindex++, rows))
{
return rows;
}
}
return NULL;
}
template <typename FetchValueHandler>
inline bool DB2_FetchRowValue(MYSQL_RES* results, MYSQL_ROW rows, int fields_index, int fields_size, FetchValueHandler&& handler) noexcept
{
if (NULL == results || NULL == rows || fields_index < 0)
{
return false;
}
unsigned int num_fields = mysql_num_fields(results);
if (fields_index >= num_fields)
{
return false;
}
if (fields_size < 1)
{
ulong* fetch_lengths = mysql_fetch_lengths(results);
if (NULL == fetch_lengths)
{
return false;
}
fields_size = fetch_lengths[fields_index];
}
char* fields_data = (char*)rows[fields_index];
if (NULL == fields_data)
{
if (fields_size > 0)
{
return false;
}
else
{
fields_data = "";
fields_size = 0;
}
}
return handler(fields_data, fields_size);
}
inline std::string DB2_FetchRowValue(MYSQL_RES* results, MYSQL_ROW rows, int fields_index, int fields_size) noexcept
{
std::string v;
if (!DB2_FetchRowValue(results, rows, fields_index, fields_size,
[&v](char* fields_data, int fields_size) noexcept
{
v.append(fields_data, fields_size);
return true;
}))
{
return "";
}
return std::move(v);
}
template <typename TValue>
inline TValue DB2_FetchRowValue(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept;
template <>
inline long long DB2_FetchRowValue<long long>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return atoll(v.data());
}
template <>
inline long DB2_FetchRowValue<long>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return atol(v.data());
}
template <>
inline int DB2_FetchRowValue<int>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return atoi(v.data());
}
template <>
inline short DB2_FetchRowValue<short>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<int>(results, rows, fields_index);
}
template <>
inline char DB2_FetchRowValue<char>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<int>(results, rows, fields_index);
}
template <>
inline unsigned long long DB2_FetchRowValue<unsigned long long>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return strtoull(v.data(), NULL, 10);
}
template <>
inline unsigned long DB2_FetchRowValue<unsigned long>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return strtoul(v.data(), NULL, 10);
}
template <>
inline unsigned int DB2_FetchRowValue<unsigned int>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<unsigned long>(results, rows, fields_index);
}
template <>
inline unsigned short DB2_FetchRowValue<unsigned short>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<unsigned long>(results, rows, fields_index);
}
template <>
inline unsigned char DB2_FetchRowValue<unsigned char>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<unsigned long>(results, rows, fields_index);
}
template <>
inline long double DB2_FetchRowValue<long double>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return strtold(v.data(), NULL);
}
template <>
inline double DB2_FetchRowValue<double>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
std::string v = DB2_FetchRowValue(results, rows, fields_index, -1);
return strtod(v.data(), NULL);
}
template <>
inline wchar_t DB2_FetchRowValue<wchar_t>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<unsigned long>(results, rows, fields_index);
}
template <>
inline bool DB2_FetchRowValue<bool>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue<unsigned long>(results, rows, fields_index) != 0;
}
template <>
inline std::string DB2_FetchRowValue<std::string>(MYSQL_RES* results, MYSQL_ROW rows, int fields_index) noexcept
{
return DB2_FetchRowValue(results, rows, fields_index, -1);
}
template <typename T>
inline std::string DB2_ParameterStatement(MySql& mysql, const T& value) noexcept { return std::to_string(value); }
template <>
inline std::string DB2_ParameterStatement<std::string>(MySql& mysql, const std::string& value) noexcept { return DB2_ParameterStatement(mysql, value.data(), value.size()); }
inline std::string DB2_ParameterStatement(MySql& mysql, const char* value) noexcept { return DB2_ParameterStatement<std::string>(mysql, NULL != value ? value : ""); }
inline std::string DB2_ParameterStatement(MySql& mysql, char* value) noexcept { return DB2_ParameterStatement(mysql, const_cast<const char*>(value)); }
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