ibatis LazyQueryContainer-如何为SQL创建QueryDefinition？

Question

I have a set of classes that can generate SQL code for me. I would like to use a generated SQL to implement the Query interface found in ibatis. I'm trying to create a special Query component that caches all results in memory.

I'm having trouble writing this method:

public void loadAllItems() {
    String sql = buildSQL();
    List<Map<String, Object>> query = DB.rows(sql, new RowBounds(0, maxRows+1));        
    this.rows = new ArrayList<Item>();
    for (Map<String,Object> row : query) {
        Item item = new PropertysetItem();
        // How can I create a QueryDefinition for my query???
        Collection<Object> propertyIds = definition.getPropertyIds();
        for (Object propertyId : propertyIds) {
            Object value = row.get(propertyId);
            if (value!=null) {
                item.addItemProperty(propertyId, new ObjectProperty(value));
            }
        }

        this.rows.add(item);
    }       
}

Here, the DB.rows method returns a List of rows. For each row, column names are mapped to column values. I have the rows and values for all columns. The only problem is that I cannot put results into a list of Item instances. I don't know how to create a QueryDefinition instance for an arbitrary SQL.

I know that there is an SQL builder ( http://mybatis.github.io/mybatis-3/statement-builders.html ) but I DO NOT want to use it. I want to use a plain SQL that was already generated, and put the results into a list of Item instances. How do I do that? What kind of properties do I need to assign before I could use these items to implement the Query interface of ibatis?

Answer 1

Okay, this was silly. They are named "properties" but actually they are just column names. So if I have a plain SQL and I know the names of the colum names then I don't need a QueryDefinition at all. Suppose we have a list of column names called "colNames" for a SQL query:

public void loadAllItems() {
    String sql = buildSQL();
    List<Map<String, Object>> query = DB.rows(sql, new RowBounds(0, maxRows+1));        
    this.rows = new ArrayList<Item>();
    for (Map<String,Object> row : query) {
        Item item = new PropertysetItem();
        for (Object colName : this.colNames) {
            Object value = row.get(colName);
            if (value!=null) {
                item.addItemProperty(colName, new ObjectProperty(value));
            }
        }

        this.rows.add(item);
    }       
}