Grails 框架直接使用sql语句

Grails 框架直接使用sql语句

grails 框架可以通过SQL语句直接对数据库进行增删改查操作，还可以创建数据库表，具体实现如下：

参考文档：Groovy SQL

优秀推荐：Groovy的SQL模块

    def dataSource
    def dataSource_lookup  // 定义已知数据源

    @Transactional
    def insertBySql()
    {
        // 1.第一种插入方式    
        def product = new Product()
        product.name = "Grails"
        product.code = "1109"
        product.lookup.save()

        // 2.第二种插入方式
        def db = new groovy.sql.Sql(dataSource_lookup)
        def params = [29, 0, 'Groovy', '1105']
        db.execute "insert into product (id, version, name, code) values (?, ?, ?, ?)", params
        db.close()

        // 3.第三种插入方式
        def dbParams = [url:'jdbc:postgresql://127.0.0.1:5432/testDataBase2', user:'test', password:'test', driver:'org.postgresql.Driver']
        db = groovy.sql.Sql.newInstance(dbParams.url, dbParams.user, dbParams.password, dbParams.driver)
        def map = [id:20, version: 1, name:'Grails', code:'9999']
        db.execute "insert into product (id, version, name, code) values ($map.id, $map.version, $map.name, $map.code)"
        db.close()

        render product as JSON
    }

 

@Transactional
    def updateBySql()
    {
        def db = new groovy.sql.Sql(dataSource_lookup)
        db.executeUpdate "update product set name='antushengtuhua' where code='1105'"
        db.close()

        render "success"
    }

def queryBySql()
    {
        // 1.第一种查询
        def db = new groovy.sql.Sql(dataSource_lookup)
        db.eachRow('select * from product') { row ->
            println row
        }

        // 2.第一种查询，支持分页
        db.eachRow('select * from product', 2, 2) 
        {
            println it
        }

        // 3.第二种查询
        def rows = db.rows("select * from product where name like 'Gra%'")
        println rows.join('\n')

        db.close()

        render "success"
    }

@Transactional
    def deleteBySql()
    {
        def db = new groovy.sql.Sql(dataSource_lookup)
        db.execute('delete from product')
        db.close()

        render "success"
    }

@Transactional
    def createTable()
    {
        def db = new groovy.sql.Sql(dataSource_lookup)
        db.execute ('''
            create table project (
                id integer not null,
                name varchar(50),
                url varchar(100)
            );
        ''')
        db.close()

        render "success"
    }