java如何提取对象[]并使用preparedstatement setObject()将其放入查询?
可能是个愚蠢的问题,但我无法运行查询。这是我的代码:
ArrayList<Attraction> getAttraction(Object[] obj) throws SQLException
{
Connection connection = facade.getConnection();
ArrayList<Attraction> attractions = new ArrayList<>();
// Check obj value
System.out.println(java.util.Arrays.toString(obj));
PreparedStatement ps = connection.prepareStatement("SELECT DISTINCT attra.attractid,attractname,x,y,z,age,weight,"
+ "height,duration,price,status FROM attraction attra "
+ "INNER JOIN attrib_bridge ab ON attra.attractId = ab.attractId "
+ "INNER JOIN attribute attri ON ab.attributeId = attri.attributeid"
+ "WHERE attri.attributename IN ?");
ps.setString(1, java.util.Arrays.toString(obj));
ResultSet rs = ps.executeQuery();
while(rs.next()){
// Initialize attraction object
Attraction attraction = new Attraction();
attraction.setAttractionId(rs.getInt(1));
attraction.setAttractionName(rs.getString(2));
attraction.setxLocation(rs.getInt(3));
attraction.setyLocation(rs.getInt(4));
attraction.setzLocation(rs.getInt(5));
attraction.setMinAge(rs.getInt(6));
attraction.setMaxWeight(rs.getInt(7));
attraction.setMinHeight(rs.getInt(8));
attraction.setRideDuration(rs.getInt(9));
attraction.setPriceRide(rs.getInt(10));
attraction.setStatus(rs.getString(11));
// Add new object to to movies
attractions.add(attraction);
}
return attractions;
}
这就是我得到的错误:
[Gentle rides, Thrill rides, Transport rides] 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 'attri.attributename IN '[Gentle rides, Thrill >rides, Transport rides]'' at line 1
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:1052) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163) at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127) at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2293) at com.ThemeParkG02.rs.control.manager.ManageAttraction.getAttraction(ManageAttraction.java:123) at com.ThemeParkG02.rs.control.manager.Facade.getAttraction(Facade.java:85) at com.ThemeParkG02.rs.control.listener.ViewAttractionListListener.run(ViewAttractionListListener.java:32)
我现在真的头晕。值已输出,但查询不起作用。“[”和“]”真的阻碍了我的进球。有什么意见吗
提前谢谢
# 1 楼答案
注意:我错过了
IN
子句的问题,但我的回答在技术上是正确的,因为SQL中的第一个错误是缺少空格。Miljen Mikic提供的链接解释了如何解决IN
子句问题你的错误是:
在
WHERE
之前缺少一个空格更新
为了提高可读性,我更喜欢这样写: