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GithubInitializer
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Moved retrieval code to bottom of database file.

This commit is contained in:
Andrew Lalis 2018-08-28 15:06:28 +02:00
parent 6b1ad84769
commit 5c3ddc6e29
1 changed files with 43 additions and 43 deletions
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86
src/main/java/nl/andrewlalis/model/database/Database.java
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@ -100,49 +100,6 @@ public class Database {
}
}
/**
* Retrieves a list of preferred partners that each student has set.
* @param studentId The student id to search by.
* @return A list of student id's for all students that the given student wishes to be their partner.
*/
private List<Integer> retrievePreferredPartners(int studentId) {
try {
logger.finest("Retrieving preferred partners of student: " + studentId);
String sql = "SELECT partner_id FROM student_preferred_partners WHERE student_id=?;";
PreparedStatement stmt = this.connection.prepareStatement(sql);
stmt.setInt(1, studentId);
ResultSet results = stmt.executeQuery();
List<Integer> partners = new ArrayList<>();
while (results.next()) {
partners.add(results.getInt(1));
}
return partners;
} catch (SQLException e) {
logger.severe("SQL Exception while retrieving preferred partners of student: " + studentId + '\n' + e.getMessage());
e.printStackTrace();
return new ArrayList<>();
}
}
/**
* Retrieves a student by their id.
* @param id The id of the student (student number)
* @return The student corresponding to this number, or null if it could not be found.
*/
public Student retrieveStudent(int id) {
try {
String sql = "SELECT * FROM persons WHERE id=?";
PreparedStatement stmt = this.connection.prepareStatement(sql);
stmt.setInt(1, id);
ResultSet result = stmt.executeQuery();
return new Student(id, result.getString("name"), result.getString("email_address"), result.getString("github_username"), this.retrievePreferredPartners(id));
} catch (SQLException e) {
logger.severe("SQL Exception while retrieving Student.\n" + e.getMessage());
e.printStackTrace();
return null;
}
}
/**
* Stores a teaching assistant without a team.
* @param ta The teaching assistant to store.
@ -258,4 +215,47 @@ public class Database {
}
}
/**
* Retrieves a list of preferred partners that each student has set.
* @param studentId The student id to search by.
* @return A list of student id's for all students that the given student wishes to be their partner.
*/
private List<Integer> retrievePreferredPartners(int studentId) {
try {
logger.finest("Retrieving preferred partners of student: " + studentId);
String sql = "SELECT partner_id FROM student_preferred_partners WHERE student_id=?;";
PreparedStatement stmt = this.connection.prepareStatement(sql);
stmt.setInt(1, studentId);
ResultSet results = stmt.executeQuery();
List<Integer> partners = new ArrayList<>();
while (results.next()) {
partners.add(results.getInt(1));
}
return partners;
} catch (SQLException e) {
logger.severe("SQL Exception while retrieving preferred partners of student: " + studentId + '\n' + e.getMessage());
e.printStackTrace();
return new ArrayList<>();
}
}
/**
* Retrieves a student by their id.
* @param id The id of the student (student number)
* @return The student corresponding to this number, or null if it could not be found.
*/
public Student retrieveStudent(int id) {
try {
String sql = "SELECT * FROM persons WHERE id=?";
PreparedStatement stmt = this.connection.prepareStatement(sql);
stmt.setInt(1, id);
ResultSet result = stmt.executeQuery();
return new Student(id, result.getString("name"), result.getString("email_address"), result.getString("github_username"), this.retrievePreferredPartners(id));
} catch (SQLException e) {
logger.severe("SQL Exception while retrieving Student.\n" + e.getMessage());
e.printStackTrace();
return null;
}
}
}