Tài liệu Grails Persistence with GORM and GSQL

Chapter 1: Defining the Model in GORM 1
The Goal of GORM .1
Defining Objects in GORM 2
Creating and Defining Simple Domain Classes 2
Creating and Defining Inheritance Trees 6
Adding Functionality to One Domain Class . 10
Adding Functionality to Multiple Domain Classes . 21
Creating Domain Classes Within Packages 30
Defining Relationships Between Classes 31
Defining Tree Relationships 46
Intermediaries and Has-Many-Through Relationships . 47
Constructing New Instances .50
Setting Basic Properties via Map Constructor 51
Setting Relationship Properties via Map Constructor . 52
Chapter 2: Customizing GORM Mapping
and Enforcing Data Integrity 55
Data Integrity Through Constraints 55
Specifying Constraints 55
Built-In Data Constraints .56
Custom Constraints .61
Customizing the Object/Relational Mapping .66
Custom and Escaped Table Names . 66
Customizing Properties . 67
Customizing the Identity Column . 71
Using Natural Identity . 73
Customizing Relationship Links . 75
Custom Association Fetching Strategies . 77
The Second-Level Cache . 78
Mapping Inheritance and Table-Per-Subclass Inheritance . 80
Disabling Optimistic Locking . 81
Demystifying Cascades .81
Chapter 3: Querying with GORM and HQL .85
Querying via Direct Methods on GORM Classes 85
get 85
lock . 89
list . 89
listOrderBy* 93
findBy*/findAllBy* 94
Querying via the Criteria Builder .99
Querying Properties . 100
Conjunctions (and/or) . 104
Negation (not) . 106
Paginated Results (maxResults/firstResult/order) 107
Querying Relationships . 108
Querying for Limited Data and Summaries (projections) 112
Explicit Methods (list/listDistinct/get/scroll) 117
Querying via the Hibernate Query Language (HQL) .119
The Basics of HQL and executeQuery . 119
Fully-Qualified Classes . 121
Retrieving Only Particular Fields with Projections 122
Associations and Joins in HQL . 123
Retrieving Maps, Lists, and Objects Inline from HQL . 125
Chapter 4: GORM Usage in Grails . 129
Constructing GORM Objects in the Controller .129
Working with Error Messages 132
Lazy Initialization and the Grails Session .134
Lazy Initialization and Open Session in View .136
The Scenario: Accessing GORM from the View 136
The Solution: Open Session in View Filter . 137
Customizing and Tuning Grails Data Source Defaults 137
Chapter 5: Filling in the Gaps with Groovy SQL and Spring’s JDBC Support . 141
Groovy SQL in Grails .141
The Role of Groovy SQL in Grails . 141
Groovy SQL Basics . 141
Injecting Groovy Sql Objects via Spring 143
Using Groovy Sql Objects with GORM Transactions 145
Spring’s JDBC Support in Grails .146
The Role of Spring JDBC Support in Grails . 146
Using Groovy to Concisely Implement Spring JDBC Support 146
Injecting Spring JDBC Support Beans 147