《MYSQL教程JDBC鏈接mysql插入數據后顯示問號的原因及解決辦法》要點:
本文介紹了MYSQL教程JDBC鏈接mysql插入數據后顯示問號的原因及解決辦法,希望對您有用。如果有疑問,可以聯系我們。
MYSQL教程1.在cmd中進入mysql查看默認的編碼格式:
MYSQL教程mysql> show variables like "%char%";
MYSQL教程若不是utf8(因為我用的是utf8),關掉mysql服務,在my.ini中添加
MYSQL教程
[client]
default-character-set=utf8
[mysqld]
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
[mysql]
default-character-set=utf8
MYSQL教程2.eclipse中的編碼格式是否為utf8
MYSQL教程3.如果還是不可以,檢查mysql客戶端表格的編碼方式
MYSQL教程
show create table tablename
MYSQL教程如果不是utf-8.刪掉重新建立一張表(之前我在原表上改動沒有成功,可能是我自己操作的原因)
MYSQL教程分享一個經典的JDBC連接MySQL的程序
MYSQL教程
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"); //加載mysq驅動
} catch (ClassNotFoundException e) {
System.out.println("驅動加載錯誤");
e.printStackTrace();//打印出錯詳細信息
}
try {
url =
"jdbc:mysql://localhost/test?user=root&password=yqs2602555&useUnicode=true&&characterEncoding=gb2312&autoReconnect = true";//簡單寫法:url = "jdbc:myqsl://localhost/test(數據庫名)? user=root(用戶)&password=yqs2602555(密碼)";
user = "root";
password = "yqs2602555";
conn = DriverManager.getConnection(url,user,password);
} catch (SQLException e) {
System.out.println("數據庫鏈接錯誤");
e.printStackTrace();
}
try {
stmt = conn.createStatement();
sql = "select * from dept";//dept這張表有deptno,deptname和age這三個字段
rs = stmt.executeQuery(sql);//執行sql語句
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("數據操作錯誤");
e.printStackTrace();
}
//關閉數據庫
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("數據庫關閉錯誤");
e.printStackTrace();
}
}
}
MYSQL教程運行結果如下:
MYSQL教程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
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