123 lines
4.1 KiB
C++
123 lines
4.1 KiB
C++
/*
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实现文件：DBop.cpp 数据库操作实现文件
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*/
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#include "DBop.h"
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/*本地的全局变量*/
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_ConnectionPtr p_conn; /*全局变量 连接对象*/
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_RecordsetPtr p_recordset; /*全局变量 记录集对象*/
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_CommandPtr p_cmd; /*全局变量 操作集对象*/
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string str_conn; /*全局变量 连接字符串设置*/
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/**
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功能： 查询所有学生的学号，将所有的指定位置的数据库信息(学号)全部存储在名为stu的vector<string>型的变量中
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@变量 stu 学生学号存储
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@返回值 成功1 失败0
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*/
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int DbStu(vector<string>& stu)
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{
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/*字符转换，方便使用*/
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string userName(g_db_userName.c_str());
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string password(g_db_password.c_str());
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string hostName(g_db_hostName.c_str());
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string dBName(g_db_dBName.c_str());
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//连接字串设置 //因为strConn是全局变量，因此仅仅初始化一次
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str_conn = "Provider=OraOLEDB.Oracle";
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str_conn += ";Persist Security Info = true";
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str_conn += ";User ID = "; //==================//
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str_conn += userName; //===仅初始化一次===//
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str_conn += ";Password="; //==================//
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str_conn += password;
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str_conn += ";Data Source = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)";
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str_conn += "(HOST=";
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str_conn += hostName;
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str_conn += ")(PORT=1521))(CONNECT_DATA=";
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str_conn += "(SERVICE_NAME=";
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str_conn += dBName;
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str_conn += ")))";
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::CoInitialize(NULL);//初始化com组件
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//连接数据库，并执行sql查询语句 【必须要用try catch捕获异常】
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try{
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p_conn.CreateInstance("ADODB.Connection");//创建连接
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p_recordset.CreateInstance("ADODB.Recordset");//创建结果集,也就是实例化
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p_cmd.CreateInstance("ADODB.Command");
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p_conn->CursorLocation = adUseClient; //存储过程同时返回记录集和返回值
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p_conn->Open(_bstr_t(str_conn.c_str()), _bstr_t(userName.c_str()), _bstr_t(password.c_str()), adConnectUnspecified);
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p_cmd->ActiveConnection = p_conn;
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//SELECT KS_ZKZ FROM ZK.V_BYSQ_BJSH_JQ_KS
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//SELECT DISTINCT(KS_ZKZ2) FROM ZK.T_BYSQ_KS_KC WHERE KSSJ BETWEEN '200907' AND '201510'
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//SELECT * FROM ZK.T_BYSQ_KS_KC WHERE (SUBSTR(KS_ZKZ2,1,2) = '02' OR SUBSTR(KS_ZKZ2,1,2) = '03')
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//SELECT KS_ZKZ2 FROM ZK.T_BYSQ_KS_KC WHERE KSSJ between '200907' and '201510' AND (SUBSTR(KS_ZKZ2,1,2) = '02') AND BJSH_JG_JQ IS NULL GROUP BY KS_ZKZ2 HAVING COUNT(KS_ZKZ2)>1
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/*HRESULT hr1 = pRecordset->Open("SELECT KS_ZKZ FROM ZK.T_BYSQ_KS_KC WHERE KSSJ between '200907' and '201510' AND (SUBSTR(KS_ZKZ2,1,2) = '02') AND BJSH_JG_JQ IS NULL GROUP BY KS_ZKZ HAVING COUNT(KS_ZKZ)>1",*/
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/*构造查询语句*/
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int zong_flag = g_db_qurry_zone.length();
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int num_flag = g_db_qurry_stu_num.length();
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int date_flag = g_db_qurry_start.length();
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string str_qurry = "SELECT KS_ZKZ FROM YANNSY.T_BYSQ_KS_KC WHERE KSSJ between ";
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str_qurry += g_db_qurry_start;
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str_qurry += " and ";
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str_qurry += g_db_qurry_end;
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// cout<<str_qurry.c_str()<<endl;
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if (num_flag - 1)//长度大于1，就是需要查询学号
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{
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str_qurry += "AND KS_ZKZ = ";
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str_qurry += g_db_qurry_stu_num;
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}
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else//不需要查询单个学号才会有区域的作用范围
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{
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if ((zong_flag - 1))//长度大于1,就是需要查询区域,且查询时间
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{
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str_qurry += " AND(SUBSTR(KS_ZKZ2, 1, 2) = ";
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str_qurry += g_db_qurry_zone;
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str_qurry += ")";
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}
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}
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if (g_db_qurry_all)
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{
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str_qurry += " AND BJSH_JG_JQ IS NULL";
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}
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str_qurry += " GROUP BY KS_ZKZ HAVING COUNT(KS_ZKZ)>1";
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_variant_t _vstr_qurry(str_qurry.c_str());/* 转换string为_variant_t */
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/*查询*/
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HRESULT hr1 = p_recordset->Open(_vstr_qurry,
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p_conn.GetInterfacePtr(),
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adOpenStatic,
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adLockOptimistic,
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adCmdText);
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if (!(SUCCEEDED(hr1))){ exit(-1); }//读取不成功，直接退出程序
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int count_exit = 10;
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do
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{//读取成功，将每一行存到vector的stu末尾
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stu.push_back((string)(_bstr_t)(p_recordset->Fields->GetItem(_variant_t("KS_ZKZ"))->GetValue()));
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p_recordset->MoveNext();//移到下一条
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} while (!p_recordset->EndOfFile && count_exit--);//条件是没有到所有记录的末尾
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}
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catch (_com_error e){
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cout << "<提取学号(数据库):>查询失败--" << endl;
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cout<<e.Error()<<" "<<e.ErrorMessage()<<" "<<e.ErrorInfo()<<endl;
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}
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/*=================================================================================================*/
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//3、关闭查询====//执行读取完毕后要关闭连接
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try { ::CoUninitialize(); }
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catch (_com_error e){ /*cout << "<提取学号:关闭失败-->" << e.ErrorInfo() << endl;*/ }
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cout<<"查询完毕"<<endl;
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return 1;
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} |