一个简单的JDBC连接程序

package com;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

public class NavalMgmtDAO {

public static void main(String[] args) {

NavalMgmtDAO navalMgmtDAO=new NavalMgmtDAO();
double sal=navalMgmtDAO.getOfficersTotalSalOnBaseCamp(38);
System.out.println(sal);

}

public int addNavalOfficer(NavalOfficer navalOfficer)
{
int no=navalOfficer.getOfficerNo();
String name=navalOfficer.getOfficerName();
String rank=navalOfficer.getOfficerRank();
double sal=navalOfficer.getOfficerSal();
int campid=navalOfficer.getBaseCampId();

Connection connection = null;
int status = 0;
DBConnectionHelper helper = new DBConnectionHelper();
connection = helper.getOracleConnection();
Statement statement = null;
try {
connection.setAutoCommit(false);
statement = connection.createStatement();
String sql = "INSERT INTO TBL_Officer_1273752 values (" +no+",'"+name+"','"+rank+"',"+sal+","+campid+")";
status = statement.executeUpdate(sql);
connection.commit();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
try {
if (statement != null)
statement.close();
// System.out.println("STATEMENT SUCCESSFULLY CLOSED");
} catch (SQLException se) {
se.printStackTrace();
}// do nothing
try {
if (connection != null)
connection.close();
// System.out.println("CONNECTION SUCCESSFULLY CLOSED");
} catch (SQLException se) {
se.printStackTrace();
}// end finally try
}// end try
if (status == 1) {
System.out.println("Data inserted successfully");
}else{
System.out.println("Connection error");
}
return status;
}

public int addBaseCamp(BaseCamp baseCamp)
{
int id=baseCamp.getBaseCampId();
String name=baseCamp.getBaseCampName();
int loc=baseCamp.getBaseCampLoc();

Connection connection = null;
int status = 0;
DBConnectionHelper helper = new DBConnectionHelper();
connection = helper.getOracleConnection();
Statement statement = null;
try {
connection.setAutoCommit(false);
statement = connection.createStatement();
String sql = "INSERT INTO TBL_Base_Camp_1273752 values (" +id+",'"+name+"','"+loc+"')";
status = statement.executeUpdate(sql);
connection.commit();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally {
try {
if (statement != null)
statement.close();
// System.out.println("STATEMENT SUCCESSFULLY CLOSED");
} catch (SQLException se) {
se.printStackTrace();
}// do nothing
try {
if (connection != null)
connection.close();
// System.out.println("CONNECTION SUCCESSFULLY CLOSED");
} catch (SQLException se) {
se.printStackTrace();
}// end finally try
}// end try
if (status == 1) {
System.out.println("Data inserted successfully");
}else{
System.out.println("Connection error");
}
return status;
}

public ArrayList<String> getOfficersNameSortedBySal()
{

ArrayList<String> arrayList=new ArrayList<String>();

Connection connection = null;
DBConnectionHelper helper = new DBConnectionHelper();
connection = helper.getOracleConnection();
Statement statement = null;
ResultSet resultSet = null;
try {
statement = connection.createStatement();
String sql = "select officer_name from tbl_officer_1273752 order by officer_sal";
resultSet = statement.executeQuery(sql);

while (resultSet.next()) {
String name = resultSet.getString(1);
arrayList.add(name);
}

} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (statement != null)
statement.close();

} catch (SQLException se) {
}// do nothing
try {
if (connection != null)
connection.close();

} catch (SQLException se) {
se.printStackTrace();
}// end finally try
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}// end try
return arrayList;

}

public ArrayList<String> getOfficersNameForBaseCampLoc(String baseCampLoc)
{
ArrayList<String> arrayList=new ArrayList<String>();

Connection connection = null;
DBConnectionHelper helper = new DBConnectionHelper();
connection = helper.getOracleConnection();
Statement statement = null;
ResultSet resultSet = null;
try {
statement = connection.createStatement();
String sql = "select officer_name from tbl_officer_1273752 where base_camp_id in (select base_camp_id from tbl_base_camp_1273752 where base_camp_loc='"+baseCampLoc+"')";
resultSet = statement.executeQuery(sql);

while (resultSet.next()) {
String name = resultSet.getString(1);
arrayList.add(name);
}

} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (statement != null)
statement.close();

} catch (SQLException se) {
}// do nothing
try {
if (connection != null)
connection.close();

} catch (SQLException se) {
se.printStackTrace();
}// end finally try
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}// end try
return arrayList;

}
public double getOfficersTotalSalOnBaseCamp(int baseCampId)
{
double sal=0;

Connection connection = null;
DBConnectionHelper helper = new DBConnectionHelper();
connection = helper.getOracleConnection();
Statement statement = null;
ResultSet resultSet = null;
try {
statement = connection.createStatement();
String sql = "select sum(officer_sal) from tbl_officer_1273752 where base_camp_id="+baseCampId+"";
resultSet = statement.executeQuery(sql);

while (resultSet.next()) {
sal= resultSet.getDouble(1);
}

} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (statement != null)
statement.close();

} catch (SQLException se) {
}// do nothing
try {
if (connection != null)
connection.close();

} catch (SQLException se) {
se.printStackTrace();
}// end finally try
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}// end try
return sal;
}

}