JDBC连接Oracle数据库后实现对emp 表数据的增删改查(转载)

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public class DBConnection {
privatestatic String url = "jdbc:oracle:thin:@localhost:1521:orcl";
privatestatic String user = "scott";
privatestatic String password = "tiger";
static{
try{
//加载驱动类
Class.forName("oracle.jdbc.driver.OracleDriver");
}catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
publicstatic Connection getConn(){
//获取连接对象
Connectioncon = null;
try{
con= DriverManager.getConnection(url, user, password);
}catch (SQLException e) {
e.printStackTrace();
}
return con;
}
public static voidclose(Connectionconn,PreparedStatement ps, ResultSet rs){
if(rs!= null){
try{
rs.close();
}catch (SQLException e) {
e.printStackTrace();
}
}
if(ps!= null){
try{
ps.close();
}catch (SQLException e) {
e.printStackTrace();
}
}
if(conn!= null){
try{
conn.close();
}catch (SQLException e) {
e.printStackTrace();
}
}
}
}

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2、创建emp 表所对应的的实体类：

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public class Emp {
private int empno;
private String ename;
private String job;
private int mgr;
private Date hiredate;
private double sal;
private double comm;
private int deptno;
public Emp(){}
public Emp(int empno, String ename, String job, int mgr, Date hiredate,
double sal, double comm, int deptno) {
super();
this.empno = empno;
this.ename = ename;
this.job = job;
this.mgr = mgr;
this.hiredate = hiredate;
this.sal = sal;
this.comm = comm;
this.deptno = deptno;
}
@Override
public String toString() {
return "Emp [empno=" + empno + ", ename=" + ename + ", job=" + job
+ ", mgr=" + mgr + ", hiredate=" + hiredate + ", sal=" + sal
+ ", comm=" + comm + ", deptno=" + deptno + "]";
}
public int getEmpno() {
return empno;
}
public void setEmpno(int empno) {
this.empno = empno;
}
public String getEname() {
return ename;
}
public void setEname(String ename) {
this.ename = ename;
}
public String getJob() {
return job;
}
public void setJob(String job) {
this.job = job;
}
public int getMgr() {
return mgr;
}
public void setMgr(int mgr) {
this.mgr = mgr;
}
public Date getHiredate() {
return hiredate;
}
public void setHiredate(Date hiredate) {
this.hiredate = hiredate;
}
public double getSal() {
return sal;
}
public void setSal(double sal) {
this.sal = sal;
}
public double getComm() {
return comm;
}
public void setComm(double comm) {
this.comm = comm;
}
public int getDeptno() {
return deptno;
}
public void setDeptno(int deptno) {
this.deptno = deptno;
}
}

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3、创建实现业务操作类，实现增删改查具体方法：

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public class EmpDao {
/**
* 增加一条数据
* insert into emp values(....)
*/
public boolean addOne(Emp emp){
boolean f = false;
//2.定义sql语句
String sql = "insert into emp values(?,?,?,?,?,?,?,?)";
//1.获取数据库连接对象
//3.获取preparedStatement对象，以发送sql语句到数据库
try (Connection conn = DBConnection.getConn();PreparedStatement ps = conn.prepareStatement(sql)){
//通过ps对象给sql语句设置参数？
ps.setInt(1, emp.getEmpno());
ps.setString(2, emp.getEname());
ps.setString(3, emp.getJob());
ps.setInt(4, emp.getMgr());
ps.setDate(5, emp.getHiredate());
ps.setDouble(6, emp.getSal());
ps.setDouble(7, emp.getComm());
ps.setInt(8, emp.getDeptno());
//4.执行sql语句
int row = ps.executeUpdate();
if(row != 0){
f = true;
}
} catch (SQLException e) {
e.printStackTrace();
}
return f;
}
/**
* 根据ID删除
* @param id
* @return
*/
public boolean delById(int id){
boolean f = false;
String sql = "delete from emp where empno=?";
try(Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);) {
ps.setInt(1, id);
int row = ps.executeUpdate();
if(row > 0){
f = true;
}
} catch (SQLException e) {
e.printStackTrace();
}
return f;
}
/**
* 根据id修改
* @return
*/
public boolean updateById(Emp emp){
boolean b = false;
String s = "update emp set ename=?,job=?,mgr=?,sal=?,comm=?,deptno=?,hiredate=? where empno=?";
try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(s);){
ps.setString(1, emp.getEname());
ps.setString(2, emp.getJob());
ps.setInt(3, emp.getMgr());
ps.setDouble(4, emp.getSal());
ps.setDouble(5, emp.getComm());
ps.setInt(6, emp.getDeptno());
ps.setDate(7, emp.getHiredate());
ps.setInt(8, emp.getEmpno());
int row = ps.executeUpdate();
if(row > 0){
b = true;
}
} catch (SQLException e) {
e.printStackTrace();
}
return b;
}
/**
* 根据id查询
* @param id
* @return
*/
public Emp queryById(int id){
Emp emp = null;
ResultSet rs = null;
String sql = "select * from emp where empno=?";
try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);){
ps.setInt(1, id);
//执行
rs = ps.executeQuery();
//结果集光标向下移动一行，如果查询到数据，返回true，否则返回false
boolean b = rs.next();
if(b){
//查询到了数据,取出数据
int empno = rs.getInt("EMPNO");
String ename = rs.getString(2);
String job = rs.getString(3);
int mgr = rs.getInt(4);
Date hiredate = rs.getDate(5);
double sal = rs.getDouble(6);
double comm = rs.getDouble(7);
int deptno = rs.getInt(8);
//将数据封装成对象
// emp = new Emp();
// emp.setEmpno(empno);
emp = new Emp(empno,ename,job,mgr,hiredate,sal,comm,deptno);
}
} catch (SQLException e) {
e.printStackTrace();
} finally{
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
return emp;
}
/**
* 查询全部数据
* @return
*/
public List<Emp> queryAll(){
List<Emp> list = new ArrayList<>();
String sql = "select * from emp";
try (Connection con = DBConnection.getConn();PreparedStatement ps = con.prepareStatement(sql);ResultSet rs = ps.executeQuery();){
//只要rs光标所在当前行有数据，rs.next()就返回true
while(rs.next()){
//取出当前行数据，封装成一个Emp对象，放入list集合
int empno = rs.getInt("EMPNO");
String ename = rs.getString(2);
String job = rs.getString(3);
int mgr = rs.getInt(4);
Date hiredate = rs.getDate(5);
double sal = rs.getDouble(6);
double comm = rs.getDouble(7);
int deptno = rs.getInt(8);
list.add(new Emp(empno,ename,job,mgr,hiredate,sal,comm,deptno));
}
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
/**
* 调用无返回值的存储过程
* @throws Exception
*/
public void callPro110() throws Exception{
Connection conn = DBConnection.getConn();
CallableStatement cs = conn.prepareCall("{call pro110}");
//执行
cs.execute();
}
}

JDBC连接Oracle数据库后实现对emp 表数据的增删改查(转载)

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