grails - Grails 3.1-多个插入域

Question

当添加一本书时，您可以执行以下操作:

String author = 'John Smith'
String title = 'First Book'
def book = new Book(author: author, title: title)
book.save(flush: flush, insert: true)

假设我想一次添加一些书籍，例如，如果输入是:

String author = 'John Smith'
String title = ['First Book', 'Second Book', 'Third Book']

如何通过一次调用保存所有书籍？

Answer 1

Groovy SQL解决方案:

def author = 'John Smith'
def titles = ['First Book', 'Second Book', 'Third Book']

def bookClassMetadata = sessionFactory.getClassMetadata(Book)

def bookTableName = bookClassMetadata.tableName

def authorColumnName = bookClassMetadata.propertyMapping.getColumnNames('author')[0]
def titleColumnName  = bookClassMetadata.propertyMapping.getColumnNames('title')[0]

def batchSize = 500

def batchSQL = "INSERT INTO ${bookTableName} (${authorColumnName}, ${titleColumnName})" +
               " VALUES (?,?)"

def sql = new Sql(dataSource)

sql.withBatch(batchSize, batchSQL) { preparedStatement ->

    titles.each { title ->

                preparedStatement.addBatch([author, title])
    }
}