在java和mysql之间建立连接时出错
以下是我的代码在java和mysql之间建立连接时出错,java,mysql,Java,Mysql,以下是我的代码 import java.sql.*; public class ConnectionTry { public static void main(String[] args) { // TODO Auto-generated method stub try { System.out.println(1); Class.forName("com.mysql.jdbc.Driver
import java.sql.*;
public class ConnectionTry {
public static void main(String[] args) {
// TODO Auto-generated method stub
try
{
System.out.println(1);
Class.forName("com.mysql.jdbc.Driver");
System.out.println(2);
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/Test","root","password");
if(!conn.isClosed())
{
System.out.println("connected");
}
System.out.println(3);
PreparedStatement ps = conn.prepareStatement("insert into User(user_id,user_name,email,password) values (?,?,?,?);");
System.out.println(4);
ps.setInt(1, 45);
System.out.println(5);
ps.setString(2, "@Suraj");
ps.setString(3, "esuraj@gmail.com");
ps.setString(4, "qwer1234");
int x = ps.executeUpdate();
if(x > 0) {
System.out.println("Registration Successful");
}
else {
System.out.println("Registration not Successful");
}
}
catch(Exception c) {
System.out.println(c.getMessage());
}
}
}
在上述代码中:
测试是数据库,
root是mysql中的用户,
密码是mysql密码
当我运行上述代码时,会出现以下错误
从服务器接收到未知的初始字符集索引“255”。可以通过“characterEncoding”属性强制设置初始客户端字符集。
尝试设置字符编码,就像错误告诉您的那样
jdbc:mysql://localhost/Test?characterEncoding=utf8
您没有指定URL数据库连接上的端口,默认情况下,该端口为3306,您的URL应该如下所示:mysql://localhost:3306/Test
这个核心jdbc文件
如果默认值是3306,为什么建议他们显式地将其设置为3306?如果他们已经使用了正确的默认值,那么这不是问题所在。
import java.sql.*;
public class jdbcInsertTable {
public static void insertvalue() throws SQLException{
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Connecting to a selected database...");
Connection con= DriverManager.getConnection
("jdbc:mysql://localhost:3306/oracl","root","root");
System.out.println("Connected database successfully...");
Statement stmt = con.createStatement();
stmt.executeUpdate("insert into employee values('sagar','sales')");
System.out.println("values insert successfully");
con.close();
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
System.out.println(e);
}
}
public static void main(String[] args) throws SQLException {
// TODO Auto-generated method stub
insertvalue();
}
}