package demo1;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.jdbc.Driver;

public class Jdbcdemo {

public static void main(String[] args) throws SQLException, ClassNotFoundException {
Connection connection=null;
PreparedStatement prepareStatement=null;
ResultSet resultSet=null;
//加载驱动
try{
Class.forName("com.mysql.jdbc.Driver");
connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/mybatis? characterEncoding=utf-8","root","root");

String sql="select*from user where username=?";
prepareStatement=connection.prepareStatement(sql);
prepareStatement.setString(1,"王五");
resultSet=prepareStatement.executeQuery();

while(resultSet.next()){
System.out.println(resultSet.getString("id")+""+resultSet.getString("username"));
}
}catch(Exception e){
e.printStackTrace();
}
finally{
if(resultSet !=null){
try{
resultSet.close();
}catch(SQLException e){
e.printStackTrace();
}
}
if(connection !=null){
try{
connection.close();
}catch(SQLException e){
e.printStackTrace();
}
}
}


{
}





}

}
报错信息
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database 'mybatis'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.Util.getInstance(Util.java:381)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1030)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3515)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3447)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:911)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3953)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1276)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2048)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)
at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:46)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:302)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:282)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at demo1.Jdbcdemo.main(Jdbcdemo.java:20)