Java程序连接数据库（mysql，sql server）以及出现的问题解决

这里因为主要的是演示Java程序与数据库的连接，所以表的建立就不详细说了。

Java程序连接mysql数据库

这里的表格是通过控制台创建的一个基本的：



在eclipse的工程环境下:需要导入一个jar包：

/**
* 连接mysql数据库
*/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
public class Testttttt{
public static void main(String[] args) throws ClassNotFoundException, SQLException {
//加载数据库驱动
Class.forName("com.mysql.jdbc.Driver");
//获取连接
Connection connection=    DriverManager.getConnection("jdbc:mysql://localhost:3306/c1604?user=root&password=");
//通过连接创建statement
Statement statament=connection.createStatement();
//定义sql  userinfo为要查询相应的表名
String sql="select * from userinfo";
//执行sql语句
ResultSet rs=statament.executeQuery(sql);
List<UserInfoBean> us=new ArrayList<UserInfoBean>();
while(rs.next()){
int id=rs.getInt("id");
String name=rs.getString("name");
UserInfoBean uib=new UserInfoBean(id, name);
us.add(uib);
}
for(int i=0;i<us.size();i++){
System.out.println(us.get(i));
}
}
}

Bean类
public class UserInfoBean {
int id;
String name;
public UserInfoBean(int id, String name) {
super();
this.id = id;
this.name = name;
}
@Override
public String toString() {
return "UserInfoBean [id=" + id + ", name=" + name + "]";
}
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;
}
}

打印的结果:

Java程序连接sql server数据库

sql server选用sql server身份验证，可能出现如下错误



具体解决方法如下：











登录后进入eclipse的环境，同样需要导入一个jar包：



Java实现的程序：

/**
* 连接sql server数据库
*/
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

public class Test {
public static void main(String[] args) throws ClassNotFoundException, Exception {
// 加载数据库驱动
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
// 获取连接  factory为数据库名
String url = "jdbc:sqlserver://localhost:1433;DatabaseName=factory"; // 连接url地址
String user = "sa"; // 数据库用户名
String password = "123456"; // 密码
Connection connection = DriverManager.getConnection(url, user, password);
// 通过连接创建statement
Statement statament = connection.createStatement();
// 定义sql depart为表名
String sql = "select * from depart";
// 执行sql语句
ResultSet rs = statament.executeQuery(sql);
List<factoryBean> us = new ArrayList<factoryBean>();
while (rs.next()) {
int did = rs.getInt("did");
String dname = rs.getString("dname");
int dmaster = rs.getInt("dmaster");
int droom = rs.getInt("droom");
factoryBean uib = new factoryBean(did, dname, dmaster, droom);
us.add(uib);
}
for (int i = 0; i < us.size(); i++) {
System.out.println(us.get(i));
}
}
}

数据库对应的表:

public class factoryBean {
int did;
String dname;
int dmaster;
int droom;
public int getDid() {
return did;
}
@Override
public String toString() {
return "FactoryBean [did=" + did + ", dname=" + dname + ", dmaster=" + dmaster + ", droom=" + droom + "]";
}
public factoryBean(int did, String dname, int dmaster, int droom) {
super();
this.did = did;
this.dname = dname;
this.dmaster = dmaster;
this.droom = droom;
}
public void setDid(int did) {
this.did = did;
}
public String getDname() {
return dname;
}
public void setDname(String dname) {
this.dname = dname;
}
public int getDmaster() {
return dmaster;
}
public void setDmaster(int dmaster) {
this.dmaster = dmaster;
}
public int getDroom() {
return droom;
}
public void setDroom(int droom) {
this.droom = droom;
}
}

打印的结果：



：