IdentifiableSqlitePersistence[T, K]

Abstract persistence component that stores data in SQLite and implements a number of CRUD operations over data items with unique ids.

Implements: SqlitePersistence[T]

Description

Important points

The data items must implement the IIdentifiable interface.
In basic scenarios, child classes shall only override GetPageByFilter, GetListByFilter or DeleteByFilter operations with a specific filter function.
All other operations can be used out of the box.
In complex scenarios child classes can implement additional operations by accessing c._collection and c._model properties.

Configuration parameters

collection: (optional) SQLite collection name
connection(s):
- discovery_key: (optional) a key to retrieve the connection from IDiscovery
- host: host name or IP address
- port: port number (default: 27017)
- uri: resource URI or connection string with all parameters in it
credential(s):
- store_key: (optional) a key to retrieve the credentials from ICredentialStore
- username: (optional) user name
- password: (optional) user password
options:
- connect_timeout: (optional) number of milliseconds to wait before timing out when connecting a new client (default: 0)
- idle_timeout: (optional) number of milliseconds a client must sit idle in the pool and not be checked out (default: 10000)
- max_pool_size: (optional) maximum number of clients the pool should contain (default: 10)

References

*:logger:*:*:1.0 - (optional) ILogger components to pass log messages
*:discovery:*:*:1.0 - (optional) IDiscovery services
*:credential-store:*:*:1.0 - (optional) Credential stores to resolve credentials (ICredentialStore)

Constructors

InheritIdentifiableSqlitePersistence

Creates a new instance of the persistence component.

InheritIdentifiableSqlitePersistence(overrides ISqlitePersistenceOverrides[T], tableName string) *IdentifiableSqlitePersistence

overrides: ISqlitePersistenceOverrides[T] - references to child class that overrides virtual methods
tableName: string - (optional) a table name.

Methods

Create

Creates a data item.

(c *IdentifiableSqlitePersistence[T, K]) Create(ctx context.Context, context IContext, item T) (result T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
item: T - item to be created.
returns: (result T, err error) - created item

DeleteById

Deletes a data item by it’s unique id.

(c *IdentifiableSqlitePersistence[T, K]) DeleteById(ctx context.Context, context IContext, id K) (result T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
id: K - id of the item to be deleted
returns: (result T, err error) - deleted item

DeleteByIds

Deletes multiple data items by their unique ids.

(c *IdentifiableSqlitePersistence[T, K]) DeleteByIds(ctx context.Context, context IContext, ids []K) error

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
ids: []K - ids of the data items to be deleted.
returns: error - error or nil.

GetListByIds

Gets a list of data items retrieved by given unique ids.

(c *IdentifiableSqlitePersistence[T, K]) GetListByIds(ctx context.Context, context IContext, ids []K) (items []T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
ids: []K - ids of the data items to be retrieved
returns: (items []T, err error) - data list

GetOneById

Gets a data item by its unique id.

(c *IdentifiableSqlitePersistence[T, K]) GetOneById(ctx context.Context, context IContext, id K) (item T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
id: K - id of the data item to be retrieved.
returns: (item T, err error) - data item.

Set

Sets a data item. If the data item exists, it updates it. Otherwise, it creates a new data item.

(c *IdentifiableSqlitePersistence[T, K]) Set(ctx context.Context, context IContext, item T) (result T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
item: T - item to be set.
returns: (result T, err error) - new or updated item

Update

Updates a data item.

(c *IdentifiableSqlitePersistence[T, K]) Update(ctx context.Context, context IContextg, item T) (result T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain.
item: T - item to be updated.
returns: (result T, err error) - updated item

UpdatePartially

Updates only a few selected fields in a data item.

(c *IdentifiableSqlitePersistence[T, K]) UpdatePartially(ctx context.Context, context IContext, id K, data cdata.AnyValueMap) (result T, err error)

ctx: context.Context - operation context.
context: IContext - (optional) a context to trace execution through a call chain
id: K - id of data item to be updated.
data: AnyValueMap - map with fields to be updated.
returns: (result T, err error) - updated item

Examples

type DummySqlitePersistence struct {
	*persist.IdentifiableSqlitePersistence[fixtures.Dummy, string]
}

func NewDummySqlitePersistence() *DummySqlitePersistence {
	c := &DummySqlitePersistence{}
	c.IdentifiableSqlitePersistence = persist.InheritIdentifiableSqlitePersistence[fixtures.Dummy, string](c, "dummies")
	return c
}

func (c *DummySqlitePersistence) DefineSchema() {
	c.ClearSchema()
	c.IdentifiableSqlitePersistence.DefineSchema()
	// Row name must be in double quotes for properly case!!!
	c.EnsureSchema("CREATE TABLE " + c.QuotedTableName() + " (\"id\" TEXT PRIMARY KEY, \"key\" TEXT, \"content\" TEXT)")
	c.EnsureIndex(c.IdentifiableSqlitePersistence.TableName+"_key", map[string]string{"key": "1"}, map[string]string{"unique": "true"})
}

func (c *DummySqlitePersistence) GetPageByFilter(ctx context.Context, context IContext,
	filter cdata.FilterParams, paging cdata.PagingParams) (page cdata.DataPage[fixtures.Dummy], err error) {

	key, ok := filter.GetAsNullableString("Key")
	filterObj := ""
	if ok && key != "" {
		filterObj += "key='" + key + "'"
	}
	sorting := ""

	return c.IdentifiableSqlitePersistence.GetPageByFilter(ctx, context,
		filterObj, paging,
		sorting, "",
	)
}

func (c *DummySqlitePersistence) GetCountByFilter(ctx context.Context, context IContext,
	filter cdata.FilterParams) (count int64, err error) {

	key, ok := filter.GetAsNullableString("Key")
	filterObj := ""
	if ok && key != "" {
		filterObj += "key='" + key + "'"
	}
	return c.IdentifiableSqlitePersistence.GetCountByFilter(ctx, context, filterObj)
}

func (c *DummySqlitePersistence) GetOneRandom(ctx context.Context, context IContext) (item fixtures.Dummy, err error) {
	return c.IdentifiableSqlitePersistence.GetOneRandom(ctx, context, "")
}