可能是一个愚蠢的问题,但我不能让查询运行。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;
}
这是我得到的错误:
[温柔的游乐设施,刺激的游乐设施,乘坐交通工具] com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException:&gt;您的SQL语法中有错误;查看与您的MySQL服务器版本相对应的手册&gt;正确的语法使用&#39; attri.attributename IN&#39; [Gentle rides,Thrill&gt; rides,Transport rides]&#39;&#39;&#39;&#39 ;在第1行
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) 在com.mysql.jdbc.Util.handleNewInstance(Util.java:411) 在com.mysql.jdbc.Util.getInstance(Util.java:386) 在com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052) 在com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3609) 在com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3541) 在com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2002) 在com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2163) 在com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2624) at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2127) 在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)
我现在真的很头晕。值已经出来但我的查询不起作用。 &#39; [&#39;和&#39;]&#39;真的阻止了我的目标。有输入的人吗?
提前致谢。
答案 0 :(得分:1)
注意:我错过了IN
子句的问题,但我的答案在技术上是正确的,因为SQL中的第一个错误是缺少的空间。 Miljen Mikic提供的链接解释了如何解决IN
条款问题。
您的错误说:
MySQLSyntaxErrorException: You have an error in >your SQL syntax
您在WHERE
之前缺少空格。
<强>更新强>
为了提高可读性,我更喜欢这样写:
String sql = "SELECT DISTINCT attra.attractid, attractname, x, y, z, age" +
", weight, height, duration, price, status" +
" FROM attraction attra" +
" JOIN attrib_bridge ab ON attra.attractId = ab.attractId" +
" JOIN attribute attri ON ab.attributeId = attri.attributeid" +
" WHERE attri.attributename IN ?";
try (PreparedStatement ps = connection.prepareStatement(sql)) {
ps.setString(1, Arrays.toString(obj));
try (ResultSet rs = ps.executeQuery()) {
while (rs.next()) {
// Process row here
}
}
}