his is my test sql:
<select id="getMap" resultType="java.util.LinkedHashMap">
select "test.name" from test where id = 1
</select>
java:
List<LinkedHashMap<String, String>> map = dataMapper.getMap();
log.info("{}", map);
output: [{test={name=628}}]
correct output should be: [{test.name=628}]
just like:mybatis autoMapping map and the column name has spot like this 'test.name' , the name will be split
Related
I have an existing linq query which gets some data into a view model object. This is working fine.
I want to add a new property for data from child table which will have column values from a child table in a comma separated string format.
Problem: I am not able to concatenate the results using string.join
Simplified version of tables showing only relevant fields
part
id
part number
1
ABC1
2
DEF1
vendor
id
vendorname
1
acme
2
john
vendor part name (vendor specific part number)
partid
vendorid
partname
1
1
GDSE-553-32
1
2
JWWVV-HH-01
simplified version of query
result = (from p in DBContext.Parts.Where(w => w.EquipmentId == eId)
select new PartModel
{
Id = p.Id,
Number = p.PartNumber,
VendorPartNames= String.Join(",", DBContext.VendorPartName.Where(w => w.PartId == p.Id).Select(s => s.PartName))//this line causes exception (shown below)
});
Exception:
LINQ to Entities does not recognize the method 'System.String Join(System.String, System.String[])' method, and this method cannot be translated into a store expression.
Please note: the actual query has some joins and other columns, so please dont suggest solutions that requires joins.
If I change the "VendorPartName" to a List type , I can get the results without any problems.
My only problem is in "How to convert the results for "VendorPartName" property to a comma separated strings?"
eg: based on sample table data provided, it should be
GDSE-553-32, JWWVV-HH-01
Entity Framework does not support String.Join() method.
So, what we can do is to fetch VendorPartNames as a string collection and then we can later separate it with ,.
Note: For this, we would first use an anonymous object and later convert it to PartModel.
So your query would look like this:
var parts = DBContext.Parts
.Where(w => w.EquipmentId == eId)
.Select(p => new {
Id = p.Id,
Number = p.PartNumber,
VendorPartNames = p.VendorPartName.Select(n => n.PartName)
}).ToList();
var result = parts.Select(i => new PartModel {
Id = i.Id,
Number = i.Number,
VendorPartNames = String.Join(",", i.VendorPartNames)
}).ToList();
I have following query which select from employee table where name is "max" and ID not in 123 and 444.
Not in IDs can grow in future. But I am receiving error as
Error
( 8023): [ERROR:flutter/lib/ui/ui_dart_state.cc(148)] Unhandled Exception: DatabaseException(near "?": syntax error (code 1 SQLITE_ERROR): , while compiling:
Query
List<String> a = [];
a.add("123");
a.add("444");
var table = await mydb.rawQuery(
"SELECT value from employee WHERE employeename = ? AND id NOT IN ? ORDER BY timestamp DESC",
["max", a]);
If the LIST is unpredictable, one way is that you can use JOIN to create your select statement with required value of NOT IN. Below is one sample.
void main() {
List<String> a = [];
a.add("123");
a.add("444");
var select =
'SELECT value from employee WHERE employeename = ? AND id NOT IN (\'' +
(a.join('\',\'')).toString() +
'\') ORDER BY timestamp DESC';
var table = await mydb.rawQuery(select, ["max"]);
}
If you print the variable select you will get
SELECT value from employee WHERE employeename = ? AND id NOT IN ('123','444')
ORDER BY timestamp DESC.
Then you can pass the above statement to rawquery and get your result.
P.S:Use your single quote and double quote accordingly.
I'd go for #arun-palanisamy 's solution, see his comment. Props go to him. I just tried the following -- with Groovy/Postgres, but the error seems to be the same, so you might want to give it a try:
String[] a = ['123', '444']
// your code, throws 'ERROR: syntax error at or near "$2"':
// def table = sql.execute("SELECT value from employee WHERE employeename = ? AND id NOT IN ? ORDER BY timestamp DESC", ["max", a])
// code of arun-palanisamy, compiles:
def table = sql.execute("SELECT value from employee WHERE employeename = ? AND id NOT IN (${a.join(', ')}) ORDER BY timestamp DESC", ["max", a])
Side notes:
You might want to try a different type for a, such as Array in my code, or even a HashMap.
There are examples (like here) where the number of ? are generated dynamically.
Update: Go for this answer, we posted simultaneously
I'm trying to create a laravel form that have an input select generating from array of strings coming from controller.
How can I set values of options manually?
In controller :
public function create()
{
$eventTypes = EventType::all()->lists('title');
return View::make('events.create')->with(compact('eventTypes'));
}
In view (blade) :
{{ Form::label('eventType', 'Type') }}
{{ Form::select('eventType', $eventTypes, null, array('class'=> 'form-control')) }}
And select created as :
<select class="form-control" id="eventType" name="eventType">
<option value="0">Sport Competition</option>
<option value="1">Movie</option>
<option value="2">Concert</option>
</select>
I just want to set values manually.
The value in the options is just the key of the array. The second parameter to the lists() method will let you choose a field to use as the key:
// use the 'id' field values for the array keys
$eventTypes = EventType::lists('title', 'id');
If you want to do something more custom than that, you'll need to manually build your array with the key/value pairs you want.
Edit
As mentioned by #lukasgeiter in the comments, there is no need to call all() first.
EventType::all()->lists() will first generate a Collection of all the EventType objects. It will then call lists() on the Collection object, meaning it will loop through that Collection to build an array with your requested fields.
EventType::lists() will call lists() on the query builder object, which will just select the two requested fields and return those as the array. It will not build any EventType objects (unless you select a field built by a Model accessor).
Hi i want query database with myBatis and want return Map
I have daoInterface Like
public interface IDocDao extends IBasicDao {
public Map<Integer, Integer> getDocByA();
}
And mapper
<select id="getDocByA" resultMap="myHashMap">
SELECT b_id, count(1) AS count FROM table_a GROUP BY b_id
</select>
And need to return 1 map with all this values, not List of Maps
thx. Pavel
If you want to return a HashMap, you need to set it as a resultType, not as a resultMap. You don't need to define myHashMap, hashmap is enough.
<select id="getDocByA" resultType="hashmap">
SELECT b_id, count(1) AS count FROM table_a GROUP BY b_id
</select>
In your way, mybatis will return this:
[{b_id=b_id1, count=count1}, {b_id=b_id2, count=count2}]. So you need to define a list to receive this data, then you can convert it into a Map by additional code to loop the list.
This seems to have eluded me. I know I can use a map to return a vanilla set of rows from a myBatis query but how to do it with a list of primitive types?
e.g. If I had SQL like:
select product_price from products
Does this require a resultMap? I've tried to use java.util.ArrayList as the result type but get class not found errors.
In a similar vein, how do I pass a list of items as an argument to a query.
Any input, pointers to docs appreciated.
Just declare the resultType as the primitive type that you want, which in your case is a Long. It will be returned as a list.
<select id="getPrice" resultType="java.lang.Long">
select product_price from products
</select>
In the mapper interface you should expect to get back a list of Long.
List<Long> getPrice();
Try using below code snippet inside your resultmap for product_price column mapping -
<collection property="price" ofType="java.lang.Long">
<result property="price" column="product_price"/>
</collection>
try using resultMap
<resultMap type="java.lang.Long" id="domainsResult">
<result property="" column="product_price"/>
</resultMap>
<select id="getPrice" resultMap="domainsResult">
select product_price from products
</select>
It will give you a List priceList.
Trey this :
You will get it as a list of map if you write like this:
<select id="getPrice" resultType="Hashmap">
select product_price from products
</select>
Where the key will be column name. Each map will contain a single entry. If You want an ArrayList then you can write a function to convert this map to an ArrayList:
public List listFromListOfMap (List<Map> listOfMap ) {
List<Integer> prices = new ArrayLisyt<Integer>();
for(int i = 0; i < listOfMap.size(); i++) {
Integer value = (Integer)listOfMap.get(i).get("product_price");
prices.add(value);
}
return prices;
}
Hope this helps :)