335 lines
8.1 KiB
C++
335 lines
8.1 KiB
C++
/*=============================================================================
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# Filename: gquery.cpp
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# Author: Bookug Lobert
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# Mail: 1181955272@qq.com
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# Last Modified: 2015-10-20 12:23
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# Description: query a database, there are several ways to use this program:
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1. ./gquery print the help message
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2. ./gquery --help simplified as -h, equal to 1
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3. ./gquery db_folder query_path load query from given path fro given database
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4. ./gquery db_folder load the given database and open console
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=============================================================================*/
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#include "../Database/Database.h"
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#include "../Util/Util.h"
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using namespace std;
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//WARN:cannot support soft links!
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void
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help()
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{
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printf("\
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/*=============================================================================\n\
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# Filename: gquery.cpp\n\
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# Author: Bookug Lobert\n\
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# Mail: 1181955272@qq.com\n\
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# Last Modified: 2015-10-20 12:23\n\
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# Description: query a database, there are several ways to use this program:\n\
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1. ./gquery print the help message\n\
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2. ./gquery --help simplified as -h, equal to 1\n\
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3. ./gquery db_folder query_path load query from given path fro given database\n\
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4. ./gquery db_folder load the given database and open console\n\
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=============================================================================*/\n");
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}
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int
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main(int argc, char * argv[])
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{
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//chdir(dirname(argv[0]));
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//#ifdef DEBUG
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Util util;
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//#endif
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if (argc == 1 || strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0)
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{
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help();
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return 0;
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}
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cout << "gquery..." << endl;
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if (argc < 2)
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{
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cout << "error: lack of DB_store to be queried" << endl;
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return 0;
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}
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{
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cout << "argc: " << argc << "\t";
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cout << "DB_store:" << argv[1] << "\t";
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cout << endl;
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}
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string db_folder = string(argv[1]);
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int len = db_folder.length();
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if(db_folder.substr(len-3, 3) == ".db")
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{
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cout<<"your database can not end with .db"<<endl;
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return -1;
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}
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//if(db_folder[0] != '/' && db_folder[0] != '~') //using relative path
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//{
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//db_folder = string("../") + db_folder;
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//}
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Database _db(db_folder);
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_db.load();
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cout << "finish loading" << endl;
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// read query from file.
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if (argc >= 3)
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{
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// ifstream fin(argv[2]);
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// if(!fin)
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// {
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// cout << "can not open: " << buf << endl;
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// return 0;
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// }
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//
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// memset(buf, 0, sizeof(buf));
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// stringstream _ss;
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// while(!fin.eof()){
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// fin.getline(buf, 9999);
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// _ss << buf << "\n";
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// }
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// fin.close();
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//
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// string query = _ss.str();
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string query = string(argv[2]);
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//if(query[0] != '/' && query[0] != '~') //using relative path
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//{
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//query = string("../") + query;
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//}
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query = Util::getQueryFromFile(query.c_str());
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if (query.empty())
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{
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return 0;
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}
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printf("query is:\n%s\n\n", query.c_str());
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ResultSet _rs;
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FILE* ofp = stdout;
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if (argc >= 4)
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{
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ofp = fopen(argv[3], "w");
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}
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string msg;
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int ret = _db.query(query, _rs, ofp);
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if(argc >= 4)
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{
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fclose(ofp);
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ofp = NULL;
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}
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//cout<<"gquery ret: "<<ret<<endl;
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if (ret <= -100) //select query
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{
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if(ret == -100)
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{
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msg = _rs.to_str();
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}
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else //query error
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{
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msg = "query failed.";
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}
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}
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else //update query
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{
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if(ret >= 0)
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{
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msg = "update num: " + Util::int2string(ret);
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}
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else //update error
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{
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msg = "update failed.";
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}
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}
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if(ret != -100)
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{
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cout << msg <<endl;
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}
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return 0;
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}
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// read query file path from terminal.
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// BETTER: sighandler ctrl+C/D/Z
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string query;
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//char resolved_path[PATH_MAX+1];
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#ifdef READLINE_ON
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char *buf, prompt[] = "gsql>";
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//const int commands_num = 3;
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//char commands[][20] = {"help", "quit", "sparql"};
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printf("Type `help` for information of all commands\n");
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printf("Type `help command_t` for detail of command_t\n");
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rl_bind_key('\t', rl_complete);
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while (true)
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{
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buf = readline(prompt);
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if (buf == NULL)
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continue;
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else
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add_history(buf);
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if (strncmp(buf, "help", 4) == 0)
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{
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if (strcmp(buf, "help") == 0)
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{
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//print commands message
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printf("help - print commands message\n");
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printf("quit - quit the console normally\n");
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printf("sparql - load query from the second argument\n");
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}
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else
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{
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//TODO: help for a given command
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}
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continue;
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}
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else if (strcmp(buf, "quit") == 0)
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break;
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else if (strncmp(buf, "sparql", 6) != 0)
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{
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printf("unknown commands\n");
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continue;
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}
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//TODO: sparql + string, not only path
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string query_file;
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//BETTER:build a parser for this console
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bool ifredirect = false;
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char* rp = buf;
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int pos = strlen(buf) - 1;
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while (pos > -1)
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{
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if (*(rp + pos) == '>')
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{
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ifredirect = true;
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break;
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}
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pos--;
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}
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rp += pos;
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char* p = buf + strlen(buf) - 1;
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FILE* fp = stdout; ///default to output on screen
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if (ifredirect)
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{
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char* tp = p;
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while (*tp == ' ' || *tp == '\t')
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tp--;
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*(tp + 1) = '\0';
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tp = rp + 1;
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while (*tp == ' ' || *tp == '\t')
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tp++;
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fp = fopen(tp, "w"); //NOTICE:not judge here!
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p = rp - 1; //NOTICE: all separated with ' ' or '\t'
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}
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while (*p == ' ' || *p == '\t') //set the end of path
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p--;
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*(p + 1) = '\0';
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p = buf + 6;
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while (*p == ' ' || *p == '\t') //acquire the start of path
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p++;
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//TODO: support the soft links(or hard links)
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//there are also readlink and getcwd functions for help
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//http://linux.die.net/man/2/readlink
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//NOTICE:getcwd and realpath cannot acquire the real path of file
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//in the same directory and the program is executing when the
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//system starts running
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//NOTICE: use realpath(p, NULL) is ok, but need to free the memory
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char* q = realpath(p, NULL); //QUERY:still not work for soft links
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#ifdef DEBUG_PRECISE
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printf("%s\n", p);
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#endif
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if (q == NULL)
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{
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printf("invalid path!\n");
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free(q);
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free(buf);
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continue;
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}
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else
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printf("%s\n", q);
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//query = getQueryFromFile(p);
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query = Util::getQueryFromFile(q);
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if (query.empty())
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{
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free(q);
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//free(resolved_path);
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free(buf);
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if (ifredirect)
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fclose(fp);
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continue;
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}
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printf("query is:\n");
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printf("%s\n\n", query.c_str());
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ResultSet _rs;
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int ret = _db.query(query, _rs, fp);
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//int ret = _db.query(query, _rs, NULL);
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string msg;
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//cout<<"gquery ret: "<<ret<<endl;
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if (ret <= -100) //select query
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{
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if(ret == -100)
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{
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msg = "";
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}
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else //query error
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{
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msg = "query failed.";
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}
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}
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else //update query
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{
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if(ret >= 0)
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{
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msg = "update num: " + Util::int2string(ret);
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}
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else //update error
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{
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msg = "update failed.";
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}
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}
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if(ret != -100)
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{
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cout << msg << endl;
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}
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//test...
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//string answer_file = query_file+".out";
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//Util::save_to_file(answer_file.c_str(), _rs.to_str());
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free(q);
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//free(resolved_path);
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free(buf);
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if (ifredirect)
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fclose(fp);
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#ifdef DEBUG_PRECISE
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printf("after buf freed!\n");
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#endif
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}
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//#else //DEBUG:this not work!
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// while(true)
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// {
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// cout << "please input query file path:" << endl;
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// string query_file;
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// cin >> query_file;
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// //char* q = realpath(query_file.c_str(), NULL);
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// string query = getQueryFromFile(query_file.c_str());
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// if(query.empty())
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// {
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// //free(resolved_path);
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// continue;
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// }
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// cout << "query is:" << endl;
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// cout << query << endl << endl;
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// ResultSet _rs;
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// _db.query(query, _rs, stdout);
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// //free(resolved_path);
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// }
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#endif // READLINE_ON
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return 0;
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}
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