使用java在mysql中使用外键插入到表中

我无法使用外键插入到表中

String querystate = " insert into state (country_idcountry, State, short, Km2, Capital, Largest City)"
                    + " values (?, ?, ?, ?, ?, ?)";
preparedStmt = conn.prepareStatement(querystate);
preparedStmt.setInt(1, cID);
preparedStmt.setString(2, sName);
preparedStmt.setString(3,sShort);
preparedStmt.setInt(4, sArea);
preparedStmt.setString(5, sCapital);
preparedStmt.setString(6, sLargest_city);
preparedStmt.execute();

cID是外键，我肯定我做错了什么，但我不知道是什么

Exception in thread "main" java.lang.IllegalStateException: Cannot connect the database!
at DB_Connect.TryConn(DB_Connect.java:67)
at Main.main(Main.java:97)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
Caused by: com.mysql.jdbc.exceptions.jdbc4.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 'mas grande) values (1, 'Córdoba', 'CBA', 165421, 'Córdoba', 'Córdoba')' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)
at DB_Connect.TryConn(DB_Connect.java:46)
... 6 more

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如果有一列中有空格，则需要引用该列

e、 g

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您的SQL语法不正确

在你准备好的陈述中，你应该只提到括号中的列名和每个相应列的问号。然后可以使用准备好的语句集方法为每个列设置值

假设您的桌子如下所示

州（国家id整数、国家文本、州文本、距离整数、大写文本、最大城市文本）

那么您的插入查询语法应该如下

String query= " insert into state (country_id , country , state , distance , capital , largest_city) values (?, ?, ?, ?, ?, ?)";
preparedStmt = conn.prepareStatement(query);
preparedStmt.setInt(1, cID);
preparedStmt.setString(2, cName);
preparedStmt.setString(3,sName);
preparedStmt.setInt(4, distance);
preparedStmt.setString(5, sCapital);
preparedStmt.setString(6, sLargest_city);
preparedStmt.execute();

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所以，抛出了一些错误还是什么？它说我的mysql语法有一个错误，但正如我对一个没有外键且一切正常的表所做的一样。请告诉我们是什么错误。请发布数据库连接的代码。您是如何连接到数据库的？这是什么意思？若您的列名包含空格，单引号可能对某些数据库不起作用。你可以尝试使用backtick，比如“最大的城市”。但不建议在表名或表列名中添加空格。问题不在于，它不起作用的唯一原因是：我的代码：

String querystate=“insert into state（country\u idcountry，state，short，Km2，Capital，maximust City）”+“value（？，，，，，，，，？）”

当它应该是

String querystate=“插入到州（国家/地区、州、短、平方公里、首都、最大城市”）“+”值（？，，，，，，，，，，？）”

String query= " insert into state (country_id , country , state , distance , capital , largest_city) values (?, ?, ?, ?, ?, ?)";
preparedStmt = conn.prepareStatement(query);
preparedStmt.setInt(1, cID);
preparedStmt.setString(2, cName);
preparedStmt.setString(3,sName);
preparedStmt.setInt(4, distance);
preparedStmt.setString(5, sCapital);
preparedStmt.setString(6, sLargest_city);
preparedStmt.execute();