在 CentOS 服务器上运行 java 代码连接 mysql
我的代码是 -
String server = "", url = "", password = "", user = "", databasename = "";
Connection con = null;
try {
server = "xxx.xxx.xxx.xxx";
databasename = "xx";
user = "user";
password = "pass";
Class.forName("com.mysql.jdbc.Driver");
url = "jdbc:mysql://" + server + "/" + databasename + "";
con = DriverManager.getConnection(url, user, password);
System.out.println(server + " Database connection established");
System.out.println(con);
} catch (Exception e) {
System.out.println("***************connection failed********************");
e.printStackTrace();
}
我的数据库在同一台服务器上运行。
我在我的本地系统和其他服务器中为同一数据库运行此代码，它运行良好，但它没有在我的数据库可用的同一服务器上运行。我得到了这个例外 -
com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '??????????????' at line 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1027)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:957)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3361)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3295)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1852)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1975)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2470)
at com.mysql.jdbc.ConnectionImpl.configureClientCharacterSet(ConnectionImpl.java:1669)
at com.mysql.jdbc.ConnectionImpl.initializePropsFromServer(ConnectionImpl.java:3336)
at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:1979)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:718)
at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:287)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:283)
at java.sql.DriverManager.getConnection(libgcj.so.10)
at java.sql.DriverManager.getConnection(libgcj.so.10)
at testthread.ConnectionFactory.getConnection(ConnectionFactory.java:28)
at testthread.ConnectionFactory.main(ConnectionFactory.java:39)
有没有人帮我看看有什么问题。