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comparison trajectorymanagement/src/TrajectoryDBAccessBlob.h @ 1159:e1e7acef8eab

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moved trajectory management library into Traffic Intelligence
author Nicolas Saunier <nicolas.saunier@polymtl.ca>
date Mon, 22 Feb 2021 22:09:35 -0500
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1158:7eb972942f22 1159:e1e7acef8eab
1 #ifndef TRAJECTORYDBACCESSBLOB_H_
2 #define TRAJECTORYDBACCESSBLOB_H_
3
4 #include "TrajectoryDBAccess.h"
5
6 /**
7 * TrajectoryDBAccessBlob class.
8 *
9 * The TrajectoryDBAccessBlob class allows to perform basic operations on a database representing trajectory as a Blob.
10 */
11 template<typename T>
12 class TrajectoryDBAccessBlob: public TrajectoryDBAccess<T>
13 {
14 public:
15 /**
16 * Create a table.
17 *
18 * @return information whether the operation was successful
19 */
20 bool createTable(const std::string& tableName = "trajectories")
21 {
22 if (!TrajectoryDBAccess<T>::db->isConnected())
23 {
24 return false;
25 }
26
27 std::string statementString = "create table "+tableName+" ( trajectory_id INTEGER, trajectory BLOB );";
28 const char *statement = statementString.c_str();
29
30 bool success = TrajectoryDBAccess<T>::db->executeStatement(statement);
31 return success;
32 }
33
34 /**
35 * Read trajectories from a database.
36 *
37 * @param[out] trajectories trajectories
38 * @param[in] limit maximum number of trajectories, which will be read
39 * @param[in] offset offset
40 * @return information whether the operation was successful
41 */
42 bool read(std::vector<Trajectory<T>*>* &trajectories, int limit = -1, int offset = -1, const std::string& tableName = "trajectories")
43 {
44 if (!TrajectoryDBAccess<T>::db->isConnected())
45 {
46 return false;
47 }
48
49 std::string statementString = "select * from "+tableName;
50 if (limit > 0)
51 {
52 statementString += " limit " + TrajectoryDBAccess<T>::toString(limit);
53 }
54 if (offset > 0)
55 {
56 statementString += " offset " + TrajectoryDBAccess<T>::toString(offset);
57 }
58 const char *statement = statementString.c_str();
59
60 std::vector<std::vector<std::string> > result;
61 bool success = TrajectoryDBAccess<T>::db->executeStatementGetMatrix(statement, result);
62 if (success)
63 {
64 if (trajectories == 0)
65 {
66 trajectories = new std::vector<Trajectory<T>*> ();
67 }
68
69 for (unsigned int i = 0; i < result.size(); ++i)
70 {
71 std::string s = "";
72 for (unsigned int j = 0; j < result[i].size(); ++j)
73 {
74 s += result[i][j];
75
76 if (j == 0)
77 {
78 s += " ";
79 }
80 }
81
82 std::istringstream is(s);
83 Trajectory<T> *trajectory = new Trajectory<T> ();
84 is >> *trajectory;
85 trajectories->push_back(trajectory);
86 }
87 }
88
89 return success;
90 }
91
92 /**
93 * Write the trajectory to the database.
94 *
95 * @param[in] trajectory trajectory
96 * @return information whether the operation was successful
97 */
98 bool write(const Trajectory<T> &trajectory, const std::string& tableName = "trajectories")
99 {
100 std::stringstream ss;
101 ss << trajectory;
102 std::string s = ss.str();
103
104 unsigned int sIdLen = TrajectoryDBAccess<T>::toString(trajectory.getId()).length();
105 s[sIdLen] = ',';
106 s.insert(sIdLen, "\"");
107 s.insert(sIdLen + 2, "\"");
108
109 std::string statementString = "insert into "+tableName+" (trajectory_id, trajectory) values (\"" + s + "\")";
110 const char *statement = statementString.c_str();
111
112 bool success = TrajectoryDBAccess<T>::db->executeStatement(statement);
113 return success;
114 }
115 };
116
117 #endif /* TRAJECTORYDBACCESSBLOB_H_ */