sqlite + java / java.sql.SQLException: 没有这样的列

问题描述

我在查询单列时遇到问题。因此，当我查询整个表时它可以工作。有什么问题？

I'm getting this error:

java.sql.sqlException: no such column: 'Id'
    at org.sqlite.jdbc3.JDBC3ResultSet.findColumn(JDBC3ResultSet.java:54)
    at org.sqlite.jdbc3.JDBC3ResultSet.getInt(JDBC3ResultSet.java:406)
    at Application.DBStatement.showData(DBStatement.java:135)
    at Application.DBStatement.createquery(DBStatement.java:121)
    at Application.DBStatement.search(DBStatement.java:179)
    at Main.MainClass.main(MainClass.java:61)

//-----------------

try {
            dbStatement.search(1,"");
        } catch (Exception e) {
            e.printstacktrace();
        }

//-------------------

public void search(int number,String searchText) throws sqlException {
        
        String searchQuery= "";
        
        switch (number) {

        case 1:
            searchQuery = "SELECT " + COLUMN_ID + " FROM " + TABLE_NAME + " WHERE " + COLUMN_Name + " = " + "'" + searchText + "'";   // that isn't working
            
            //searchQuery = "SELECT * FROM " + TABLE_NAME + " WHERE " + COLUMN_Name + " = " + "'" + searchText + "'";   // that's working
            
        break;
        
        default:
            break;
        }           
    }

//-----------------------

public void createTable() throws sqlException {
    
        
        String createTable= "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + 
                "( " 
                 + COLUMN_ID + " INTEGER PRIMARY KEY,"
                 + COLUMN_Name + " TEXT NOT NULL,"
                 + COLUMN_EMail + " TEXT NOT NULL,"
                 + COLUMN_Registration_Date + " TEXT NOT NULL "
                
                + " )";     
    }

解决方法

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