jdbc（java连接数据库oracle）

package day20151020jdbc;

public class Emp {
private int id;
private String name;
private String gender;
private double salary;
public Emp(int id, String name, String gender, double salary) {
super();
this.id = id;
this.name = name;
this.gender = gender;
this.salary = salary;
}

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}

@Override
public String toString() {
return id + "," + name + "," +gender+","+ salary;
}

}

package day20151020jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class JdbcTest {
public static void main(String[] args) {
Connection conn = null;
PreparedStatement ps = null;
ResultSet rs = null;
List<Emp> list = new ArrayList<Emp>();
try{
//加载驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//建立连接
conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:xe",
"userid","password");
String sql = "select * from emp";

//预编译sql
ps = conn.prepareStatement(sql);

//执行sql
rs = ps.executeQuery();

while(rs.next()){
int id = rs.getInt("id");
String name = rs.getString("name");
String gender = rs.getString("gender");
double salary = rs.getDouble(4);
//System.out.println(id + "," + name + "," +gender+","+ salary);
Emp emp = new Emp(id,name,gender,salary);
list.add(emp);
}
//System.out.println(list);
for(Emp emp : list){
System.out.println(emp);
}
ps.close();
//插入数据
String sql1 = "insert into emp values(?,?,?,?)";
ps = conn.prepareStatement(sql1);
ps.setInt(1, 1005);
ps.setString(2, "钱七");
ps.setString(3, "F");
ps.setDouble(4, 15000.5);
//返回类型为int，返回值是对数据库修改了几条数据
int a = ps.executeUpdate();
if(a>0){
System.out.println("插入数据成功");
}else{
System.out.println("插入数据失败");
}
}catch(Exception e){

}finally{
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}