1.在cmd中進入mysql查看默認的編碼格式:
mysql> show variables like "%char%";
若不是utf8(因為我用的是utf8)，關掉mysql服務，在my.ini中添加
[client] default-character-set=utf8 [mysqld] default-storage-engine=INNODB character-set-server=utf8 collation-server=utf8_general_ci [mysql] default-character-set=utf8
2.eclipse中的編碼格式是否為utf8
3.如果還是不可以，檢查mysql客戶端表格的編碼方式
show create table tablename
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）
分享一個經典的JDBC連接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();
}
}
}
運行結果如下：
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
