NCSqlColumn (Apache NLPCraft 0.9.0)

```
public interface NCSqlColumn
```
Object presentation of SQL column.
In JSON/YAML generated model SQL column is represented by the model element (example):
```
   elements:
     - id: "col:orders_customer_id"
       groups:
       - "column"
       synonyms:
       - "{customer_id|customer <ID>}"
       - "orders {customer_id|customer <ID>}"
       - "{customer_id|customer <ID>} <OF> orders"
       metadata:
         sql:name: "customer_id"
         sql:tablename: "orders"
         sql:datatype: 12
         sql:isnullable: true
         sql:ispk: false
       description: "Auto-generated from 'orders.customer_id' column."
       valueLoader: "org.apache.nlpcraft.examples.sql.db.SqlValueLoader"
 
```
Few notes:
- All model elements representing SQL column have ID in a form of col:sql_table_name.
- All model elements representing SQL column belong to column group.
- These model elements have auto-generated synonyms and set of mandatory metadata.
- User can freely add group membership, change synonyms, add new metadata, add or change value loader.
See Also:

NCSqlSchemaBuilder.makeSchema(NCModel), NCSqlExtractorBuilder.build(NCSqlSchema, NCVariant), NCSqlExtractor.extractColumn(NCToken), NCSqlTable.getColumns(), NCSqlSchema.getAllColumns()

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`getColumn()`	Gets native name of this column.
`int`	`getDataType()`	Gets JDBC data type for this column.
`String`	`getTable()`	Gets name of the table this column belongs to.
`boolean`	`isNullable()`	Tests whether or not this column is nullable.
`boolean`	`isPk()`	Tests whether or not this column is a primary key column.

- Method Detail
  - getTable
```
String getTable()
```
    Gets name of the table this column belongs to.
    In JSON/YAML generated model the table name is declared with the following element metadata (example):
    sql:tablename: "customer_id"
    Returns:
    
    Name of the table this column belongs to.
  - getColumn
```
String getColumn()
```
    Gets native name of this column.
    In JSON/YAML generated model the native column name is declared with the following element metadata (example):
    sql:name: "customer_id"
    Returns:
    
    Name of this column.
  - getDataType
```
int getDataType()
```
    Gets JDBC data type for this column.
    In JSON/YAML generated model the data type is declared with the following element metadata (example):
    sql:datatype: 12
    Returns:
    
    JDBC data type for this column.
  - isPk
```
boolean isPk()
```
    Tests whether or not this column is a primary key column.
    In JSON/YAML generated model the primary key flag is declared with the following element metadata (example):
    sql:ispk: false
    Returns:
    
    Whether or not this column is a primary key column.
  - isNullable
```
boolean isNullable()
```
    Tests whether or not this column is nullable.
    In JSON/YAML generated model the nullable flag is declared with the following element metadata (example):
    sql:isnullable: false
    Returns:
    
    Whether or not this column is nullable.