题
我在Java程序中创建MySQL表方面有问题。我经常得到无法创建表... errno:150
这是我的代码:
String URL="jdbc:mysql://192.168.1.128:3306";
Connection con=(Connection) DriverManager.getConnection(URL,user,pass);
Statement stmt=(Statement) con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
Statement stmt1=(Statement) con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
String mySQL_new_table=("CREATE TABLE IF NOT EXISTS dbtest.T_AJPES_TR " + "(" + "row_count INT PRIMARY KEY AUTO_INCREMENT,"
+ "rn CHAR(15),sSpre CHAR(5),reg CHAR(5),eno VARCHAR(10),davcna VARCHAR(15),Ime VARCHAR(75),Priimek VARCHAR(75),LOG_ID INT,INDEX L_ID (LOG_ID),FOREIGN KEY(LOG_ID) references T_AJPES_TR_LOG(ID_LOG) ON DELETE CASCADE ON UPDATE CASCADE) ENGINE = INNODB;");
String mySQL_log = ("CREATE TABLE IF NOT EXISTS dbtest.T_AJPES_TR_LOG" + "(ID_LOG INT PRIMARY KEY AUTO_INCREMENT, Date_import VARCHAR(45),File_import VARCHAR(75)) ENGINE = INNODB;");
stmt.executeUpdate(mySQL_new_table);
stmt1.executeUpdate(mySQL_log);
ResultSet uprs=stmt.executeQuery("SELECT * FROM dbtest.T_AJPES_TR");
ResultSet uprs1=stmt1.executeQuery("SELECT * FROM dbtest.T_AJPES_TR_LOG");
我用谷歌搜索了许多用于创建外键的教程,但我仍然有问题。那我做错了什么?
解决方案
您可能对外国密钥限制有问题,请参阅 http://dev.mysql.com/doc/refman/5.1/en/innodb-foreign-foreign-key-constraints.html 更多细节。
首先要检查的是您的log_id引用t_ajpes_tr_log(id_log)是正确的
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