mysql的jdbc链接软件_一个经典的JDBC连接MySQL的程序
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class MySQLConnection {
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
String url = null;
String user = null;
String password = null;
String sql = null;
try {
Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动
} catch (ClassNotFoundException e) {
System.out.println("驱动加载错误");
e.printStackTrace();//打印出错详细信息
}
try {
url =
"jdbc:mysql://localhost/test?user=root&password=yqs2602555&useUnicode=true&&characterEncoding=gb2312&autoReconnect
= true";//简单写法：url = "jdbc:myqsl://localhost/test(数据库名)?
user=root(用户)&password=yqs2602555(密码)";
user = "root";
password = "yqs2602555";
conn = DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
System.out.println("数据库链接错误");
e.printStackTrace();
}
try {
stmt = conn.createStatement();
sql = "select * from dept";//dept这张表有deptno，deptname和age这三个字段
rs = stmt.executeQuery(sql);//执行sql语句
while(rs.next()) {
System.out.print(rs.getInt("deptno") + " ");
System.out.print(rs.getString("deptname") + " ");
System.out.println(rs.getInt("age") + " ");
}
} catch (SQLException e) {
System.out.println("数据操作错误");
e.printStackTrace();
}
//关闭数据库
try {
if(rs != null) {
rs.close();
rs = null;
}
if(stmt != null) {
stmt.close();
stmt = null;
}
if(conn != null) {
conn.close();
conn = null;
}
} catch(Exception e) {
System.out.println("数据库关闭错误");
e.printStackTrace();
}
}
}
运行结果如下：
1 yqs 0
2 hello 0
3 yqsshr 0
4 world 0
5 hryspa 0
1 yqs 0
2 hello 0
3 yqsshr 0
4 world 0
5 hryspa 0
1 yqs11 21
1 yqs21 31
1 yqs31 41
1 yqs41 51
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; public class MySQLConnection { public static void main(String[] args) { Connection conn = null; Statement stmt = null; ResultSet rs = null; String url = null; String user = null; String password = null; String sql = null; try { Class.forName("com.mysql.jdbc.Driver"); //加载mysq驱动 } catch (ClassNotFoundException e) { System.out.println("驱动加载错误"); e.printStackTrace();//打印出错详细信息 } try { url = "jdbc:mysql://localhost/test?user=root&password=yqs2602555&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";//简单写法：url = "jdbc:myqsl://localhost/test(数据库名)? user=root(用户)&password=yqs2602555(密码)"; user = "root"; password = "yqs2602555"; conn = DriverManager.getConnection(url,user,password); } catch (SQLException e) { System.out.println("数据库链接错误"); e.printStackTrace(); } try { stmt = conn.createStatement(); sql = "select * from dept";//dept这张表有deptno，deptname和age这三个字段 rs = stmt.executeQuery(sql);//执行sql语句 while(rs.next()) { System.out.print(rs.getInt("deptno") + " "); System.out.print(rs.getString("deptname") + " "); System.out.println(rs.getInt("age") + " "); } } catch (SQLException e) { System.out.println("数据操作错误"); e.printStackTrace(); } //关闭数据库 try { if(rs != null) { rs.close(); rs = null; } if(stmt != null) { stmt.close(); stmt = null; } if(conn != null) { conn.close(); conn = null; } } catch(Exception e) { System.out.println("数据库关闭错误"); e.printStackTrace(); } } } 运行结果如下： 1 yqs 0 2 hello 0 3 yqsshr 0 4 world 0 5 hryspa 0 1 yqs 0 2 hello 0 3 yqsshr 0 4 world 0 5 hryspa 0 1 yqs11 21 1 yqs21 31 1 yqs31 41 1 yqs41 51