transaction manager constructor

README.md

@@ -112,14 +112,12 @@ Another example with an update
 store.Update(PUBLISHER).Submit(&publisher)
 ```
 
-and the shorter version...
+and the shortest version...
 
 ```go
 store.Modify(&publisher)
 ```
-<br>
-Besides the examples in this page there are a lot more examples in the
-[Kanban taskboard](//github.com/quintans/taskboard) specifically [here](//github.com/quintans/taskboard/blob/master/biz/impl/TaskBoardService.go).
+
 
 ## Features
 
@@ -209,31 +207,18 @@ var (
 // the transaction manager
 var TM ITransactionManager
 
-func init() {
+func main() {
 	// database configuration
 	mydb, err := sql.Open("mysql", "root:root@/gosql?parseTime=true")
 	if err != nil {
 		panic(err)
 	}
 
-	translator := trx.NewMySQL5Translator()
-
 	// transaction manager
-	TM = NewTransactionManager(
-		// database
-		mydb,
-		// database context factory
-		func(c dbx.IConnection) IDb {
-			return NewDb(c, translator)
-		},
-		// statement cache
-		1000,
-	)
-}
+	tm = NewDefaultTransactionManager(mydb, trx.NewMySQL5Translator())
 
-func main() {
-	// get the databse context
-	store := TM.Store()
+	// get the database context
+	store := tm.Store()
 	// the target entity
 	var publisher Publisher
 	// Retrieve
@@ -246,14 +231,14 @@ func main() {
 }
 ```
 
-Source from [intro.go](intro.go).
+Source from [basic.go](./example/basic.go).
 
-You can also check out [common.go](test/common/common.go) for a lot more examples.
+You can also check out [common.go](./test/common/common.go) for a lot more examples.
 
 <br>
 
 In the following chapters I will try to explain the several aspects of the library using a set of examples.
-These examples are supported by tables defined in [tables_mysql.sql](test/mysql/tables_mysql.sql), a MySQL database sql script.
+These examples are supported by tables defined in [tables_mysql.sql](./test/mysql/tables_mysql.sql), a MySQL database sql script.
 
 I will start first by describing the table model and how to map the entities.
 

db/transaction_manager.go

@@ -90,13 +90,34 @@ type TransactionManager struct {
 // dbFactory is a database connection factory. This factory accepts boolean flag that indicates if the created IDb is still valid.
 // This may be useful if an Entity holds a reference to the IDb to do lazy loading.
 func NewTransactionManager(database *sql.DB, dbFactory func(dbx.IConnection) IDb, capacity int) *TransactionManager {
-	this := new(TransactionManager)
-	this.database = database
-	this.dbFactory = dbFactory
+	t := new(TransactionManager)
+	t.database = database
+	t.dbFactory = dbFactory
 	if capacity > 1 {
-		this.stmtCache = cache.NewLRUCache(capacity)
+		t.stmtCache = cache.NewLRUCache(capacity)
 	}
-	return this
+	return t
+}
+
+func NewDefaultTransactionManager(database *sql.DB, translator Translator) *TransactionManager {
+	// transaction manager
+	return NewTransactionManager(
+		database,
+		func(c dbx.IConnection) IDb {
+			return NewDb(c, translator)
+		},
+		1000,
+	)
+}
+
+func (t *TransactionManager) SetCacheSize(capacity int) {
+	if capacity > 1 {
+		t.stmtCache = cache.NewLRUCache(capacity)
+	}
+}
+
+func (t *TransactionManager) SetDbFactory(dbFactory func(dbx.IConnection) IDb) {
+	t.dbFactory = dbFactory
 }
 
 func (t *TransactionManager) With(db IDb) ITransactionManager {

example/basic.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"github.com/quintans/goSQL/db"
-	"github.com/quintans/goSQL/dbx"
 	trx "github.com/quintans/goSQL/translators"
 
 	_ "github.com/go-sql-driver/mysql"
@@ -27,38 +26,25 @@ var (
 )
 
 // the transaction manager
-var TM db.ITransactionManager
+var tm db.ITransactionManager
 
-func init() {
+func main() {
 	// database configuration
 	mydb, err := sql.Open("mysql", "root:root@/gosql?parseTime=true")
 	if err != nil {
 		fmt.Printf("%+v\n", err)
 		panic(err)
 	}
 
-	translator := trx.NewMySQL5Translator()
-
 	// transaction manager
-	TM = db.NewTransactionManager(
-		// database
-		mydb,
-		// database context factory
-		func(c dbx.IConnection) db.IDb {
-			return db.NewDb(c, translator)
-		},
-		// statement cache
-		1000,
-	)
-}
+	tm = db.NewDefaultTransactionManager(mydb, trx.NewMySQL5Translator())
 
-func main() {
 	// get the databse context
-	store := TM.Store()
+	store := tm.Store()
 	// the target entity
 	var publisher Publisher
 	// Retrieve
-	_, err := store.Retrieve(&publisher, 2)
+	_, err = store.Retrieve(&publisher, 2)
 	if err != nil {
 		fmt.Printf("%+v\n", err)
 		panic(err)