我正在使用带有eclipse和mysql的Java数据库。我有一个用于连接数据库并将变量写入数据库的类，这是该类：
package model;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class AddChannelDb {
public void AddToDb(String channelName, int channelNo)
throws ClassNotFoundException, SQLException {
String myDriver = "com.mysql.jdbc.Driver";
String db = "jdbc:mysql://localhost/digiturkschema";
Class.forName(myDriver);
Connection conn = DriverManager.getConnection(db, "root",
"****");
Statement st = conn.createStatement();
st.executeUpdate("INSERT INTO channelstable(channelNo,channelName) VALUES ("+ channelNo + "," + channelName + ")");
}
}
这两个变量（channelName和channelNo）是由用户在我的视图类中输入的，并且来自文本字段的get方法。我得到这些变量没有问题，我控制了它，但是以某种方式无法将其写入数据库。当我为channelName输入“ showTv”，为channelNo输入“ 21”时，出现如下错误：
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'showTv' in 'field list'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2788)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1816)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1730)
at model.AddChannelDb.AddToDb(AddChannelDb.java:18)
at controller.DigiTurkController$addChannelBtnListener.actionPerformed(DigiTurkController.java:47)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$400(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
我非常努力地搜索网络，但是却找不到任何东西。它看起来像是一个简单的问题，但我无法解决它。感谢您的时间和帮助。（顺便说一句，我确定表名和变量名是正确的。）
最佳答案
更改此：
st.executeUpdate("INSERT INTO channelstable(channelNo,channelName) VALUES ("+ channelNo + "," + channelName + ")");
至：
st.executeUpdate("INSERT INTO channelstable(channelNo,channelName) VALUES (\'"+ channelNo + "\',\'" + channelName + "\')");
基本上，您缺少要插入的值周围的引号。
撇开注释：我建议您使用preparedStatement，在这里您不必照顾引号，并且您的SQL将是安全的，并且不易受到SQL注入的影响，因为它目前处于当前形式。