title: JAVA使用JDBC连接ORACLE数据库基础版
date: 2023-08-17
categories:
- 数据库
tags: - 数据库
- 总结
- Oracle
- jdbc
JAVA使用JDBC连接ORACLE数据库基础版
数据库jdbc连接一共分一下几步
maven的oracle依赖
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0.4</version>
</dependency>
1、加载驱动
Class.forName(driver);
2、数据库链接
//连接数据库的地址，用户名和密码
String url = "jdbc:oracle:thin:@localhost:1521:orcl1";
String name = "hr";
String pass = "orcl";
conn = DriverManager.getConnection(url,name,pass);
3、(statement定义语句对象，sql语句)
Statement st = con.createStatement();
//定义一个sql语句
String sql = "select department_id,department_name,location_id from departments";
4、执行sql语句
ResultSet rs = st.executeQuery(sql);
5、调用结果集的方法实现遍历
while(rs.next()){
//获得结果集的数据,下标从1开始，1表示一行第一列，2表示第二列
int id = rs.getInt(1);
String name = rs.getString(2);
String pass = rs.getString(3);
System.out.println("部门号是："+id+" 部门名是："+name+" 部门所在地是："+pass);
}
6、关闭资源
rs.close();
ps.close();
conn.close();
案例
Department属性类
package vo;
public class Department {
private int departmentId;
private String departmentName;
private int manager_id;
private int location_id;
public int getDepartmentId() {
return departmentId;
}
public void setDepartmentId(int departmentId) {
this.departmentId = departmentId;
}
public String getDepartmentName() {
return departmentName;
}
public void setDepartmentName(String departmentName) {
this.departmentName = departmentName;
}
public int getManager_id() {
return manager_id;
}
public void setManager_id(int manager_id) {
this.manager_id = manager_id;
}
public int getLocation_id() {
return location_id;
}
public void setLocation_id(int location_id) {
this.location_id = location_id;
}
public String toString(){
return "id:"+departmentId+" name:"+departmentName;
}
}
DepartmentsDao定义jdbc并测试
package dao;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import vo.Department;
public class DepartmentsDao {
//实现连接数据库查询所有的部门信息
public void getAllDepartments(){
try {
//连接数据库的地址，用户名和密码
String url = "jdbc:oracle:thin:@localhost:1521:orcl1";
String name = "hr";
String pass = "orcl";
//1,加载数据库驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//2,获得连接
Connection con = DriverManager.getConnection(url, name, pass);
//3定义语句对象
Statement st = con.createStatement();
//定义一个sql语句
String sql = "select department_id,department_name,location_id from departments";
//4，执行sql语句，查询
ResultSet rs = st.executeQuery(sql);
//调用结果集的next方法实现遍历
while(rs.next()){
//获得结果集的数据
int id = rs.getInt("department_id");
String dname = rs.getString("department_name");
int lid = rs.getInt("location_id");
System.out.println(id+" "+dname+" "+lid);
}
//5,关闭资源
rs.close();
st.close();
con.close();
}
catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//根据id和名字查询信息
public Department getDepartmentById(int id,String departmentName){
Connection con = null;
Statement st = null;
ResultSet rs = null;
try {
//连接数据库的地址，用户名和密码
String url = "jdbc:oracle:thin:@localhost:1521:orcl1";
String name = "hr";
String pass = "orcl";
//1,加载数据库驱动
Class.forName("oracle.jdbc.driver.OracleDriver");
//2,获得连接
con = DriverManager.getConnection(url, name, pass);
//3定义语句对象
st = con.createStatement();
//定义一个sql语句
String sql = "select * from departments where department_id="+id+" and department_name='"+departmentName+"'";
//4，执行sql语句，查询
rs = st.executeQuery(sql);
//调用结果集的next方法实现遍历
if(rs.next()){
Department d = new Department();
d.setDepartmentId(rs.getInt(1));
d.setDepartmentName(rs.getString(2));
d.setManager_id(rs.getInt(3));
d.setLocation_id(rs.getInt(4));
return d;
}
}
catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
try {
rs.close();
st.close();
con.close();
}
catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
public static void main(String[] args) {
// TODO Auto-generated method stub
DepartmentsDao dao = new DepartmentsDao();
//dao.getAllDepartments();
Department d = dao.getDepartmentById(60, "IT");
System.out.println(d);
}
}