Add a better example to the README, use constanst in the example.

Signed-off-by: Manuel Carmona <manu.carmona90@gmail.com>

Author: mcarmonaa

README.md

@@ -45,26 +45,52 @@ We are continuously adding more functionality to go-mysql-server. We support a s
 
 ```go
 ...
-driver := sqle.New()
-driver.AddDatabase(createTestDatabase())
-
-auth := mysql.NewAuthServerStatic()
-auth.Entries["user"] = []*mysql.AuthServerStaticEntry{{
-    Password: "pass",
-}}
-
-config := server.Config{
-    Protocol: "tcp",
-    Address:  "localhost:3306",
-    Auth:     auth,
+
+func main() {
+	driver := sqle.New()
+	driver.AddDatabase(createTestDatabase())
+
+	auth := mysql.NewAuthServerStatic()
+	auth.Entries["user"] = []*mysql.AuthServerStaticEntry{{
+		Password: "pass",
+	}}
+
+	config := server.Config{
+		Protocol: "tcp",
+		Address:  "localhost:3306",
+		Auth:     auth,
+	}
+
+	s, err := server.NewDefaultServer(config, driver)
+	if err != nil {
+		panic(err)
+	}
+
+	s.Start()
 }
 
-s, err := server.NewDefaultServer(config, driver)
-if err != nil {
-    panic(err)
+func createTestDatabase() *mem.Database {
+	const (
+		dbName    = "test"
+		tableName = "mytable"
+	)
+
+	db := mem.NewDatabase(dbName).(*mem.Database)
+	table := mem.NewTable(tableName, sql.Schema{
+		{Name: "name", Type: sql.Text, Nullable: false, Source: tableName},
+		{Name: "email", Type: sql.Text, Nullable: false, Source: tableName},
+		{Name: "phone_numbers", Type: sql.JSON, Nullable: false, Source: tableName},
+		{Name: "created_at", Type: sql.Timestamp, Nullable: false, Source: tableName},
+	})
+
+	db.AddTable(tableName, table)
+	table.Insert(sql.NewRow("John Doe", "john@doe.com", []string{"555-555-555"}, time.Now()))
+	table.Insert(sql.NewRow("John Doe", "johnalt@doe.com", []string{}, time.Now()))
+	table.Insert(sql.NewRow("Jane Doe", "jane@doe.com", []string{}, time.Now()))
+	table.Insert(sql.NewRow("Evil Bob", "evilbob@gmail.com", []string{"555-666-555", "666-666-666"}, time.Now()))
+	return db
 }
 
-s.Start()
 ...
 ```
 

_example/main.go

@@ -52,15 +52,15 @@ func createTestDatabase() *mem.Database {
 		tableName = "mytable"
 	)
 
-	db := mem.NewDatabase("test").(*mem.Database)
-	table := mem.NewTable("mytable", sql.Schema{
+	db := mem.NewDatabase(dbName).(*mem.Database)
+	table := mem.NewTable(tableName, sql.Schema{
 		{Name: "name", Type: sql.Text, Nullable: false, Source: tableName},
 		{Name: "email", Type: sql.Text, Nullable: false, Source: tableName},
 		{Name: "phone_numbers", Type: sql.JSON, Nullable: false, Source: tableName},
 		{Name: "created_at", Type: sql.Timestamp, Nullable: false, Source: tableName},
 	})
 
-	db.AddTable("mytable", table)
+	db.AddTable(tableName, table)
 	table.Insert(sql.NewRow("John Doe", "john@doe.com", []string{"555-555-555"}, time.Now()))
 	table.Insert(sql.NewRow("John Doe", "johnalt@doe.com", []string{}, time.Now()))
 	table.Insert(sql.NewRow("Jane Doe", "jane@doe.com", []string{}, time.Now()))