Fall Extension ProjectTasks Needed for MissionMapEditor

Martin Q. ZhaoSeptember 18, 2010

DB Connectivity In MMEditorP

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DAO

JDBC Framework

DBTable

Table

DBMS

Application(client)

DB Server

Driver

Connection

Statement

ResultSet

creates

executes

returns

java.sqlMMEditor

MySQLServer Instance

mysql-connector.jar

implements

New DB Functions 4 MMEditorAdd

updateMapToDb

Add updateMissio

ndeleteMission

Similar design can be used in VulnerabilityTracker

Sample JDBC CodeGet connection to DB server

Run query and process results

// set driverString driverName =

"com.mysql.jdbc.Driver";try { Class.forName(driverName);} catch (ClassNotFoundException e) {}

// get connectionurlBase =

"jdbc:mysql://localhost:3306/“try { conn = DriverManager

.getConnection(urlBase + dbName, user, pwd);

} catch (SQLException e) {}

// get statement, which embodies queriestry { stmt = conn.createStatement();} catch (SQLException e) {}

Driver

Connection

Statement

ResultSet

creates

executes

returns

java.sql

Sample JDBC Code - continuedExecute update commands Run query and process

results// execute an insert statementString insertCommand = "INSERT INTO

Mission VALUES (";insertCmd += m.getId() + ", '" +

m.getName() +"', null, 1, " + lookupMissionId(m.getType()) +

",1";insertCommand += ")";

int rowsAffected = 0;try { rowsAffected =

stmt.executeUpdate(insertCmd);} catch (SQLException e) {}

// execute an select queryString query = "SELECT SubMissionId

FROM MissionSubMissionMap "+

"WHERE MissionId = " + parentMissionId;

LinkedList<Long> ids = new LinkedList<Long>();

try { ResultSet rs =

stmt.executeQuery(query); while (rs.next()) { ids.addLast(rs.getLong(1)); }} catch (SQLException e) {}