Question

我将一个grails（2.2.4）应用程序部署到JBoss（5.2）服务器，并为Oracle DB设置了数据库：

datasource { 
    dbCreate = 'update'
    jndiName = 'java:XXX
}

我还有两个域对象：

class A {
    def name
    static hasOne = [b:B]
    static constraints = { 
        b unique: true
        name unique: true
    }
}

class B {
    A a
    static belongsTo = [A]
}

最后是一个用于查找/创建A：

实例的服务

A createA(String name) {
    def a = A.findByName(name)
    if(!a) {
        a = new A(name: name)
        a.b =  new B(a: a)
        a.save() <-- This causes the ERROR. Tried a.save(flush:true), a.save(failOnError:true) and a.save(flush:true, failOnError:true)
    }
    return a
}

当使用Hibernates自己的H2数据库并使用 grails run-app 和 grails run-war 进行本地测试时，这项工作正常，但在与Oracle DB集成并部署之后到JBoss服务器我收到以下错误：

Hibernate operation: could not execute query; uncategorized SQLException for SQL [
    select this_.id as id1_0_, this_.version as version1_0_, this_.name as name1_0_ 
    from a this_ 
    where this_.id=?]; 
SQL state [99999]; error code [17041]; 
Missing IN or OUT parameter at index:: 1; 
nested exception is java.sql.SQLException: Missing IN or OUT parameter at index:: 1

任何人都知道这里出了什么问题？

Answer 1

考虑到您可以更改域类，我会对您的域类进行以下更改。

class A {
    def name
    static hasOne = [b:B]
    static constraints = { 
        //b unique: true    // try commenting this line out
        name unique: true   
    }
}

class B {
    A a
    // static belongsTo = [A] // I don't think you need this.
}

在您的服务上，

A createA(String name) {
    def a = A.findByName(name)
    if(!a) {
        a = new A(name: name).save(flush:true, failOnError:true)
        //a.b =  new B(a: a)  // this feels going around in circles.
        new B(a: a).save(flush:true, failOnError:true)

        // you may only need one save() and the changes will cascade. 
        //I will leave that upto you which save() cascades and which one doesn't.  
    }
    return a
}

此外，您可以查看此http://docs.grails.org/2.3.1/ref/Domain%20Classes/findOrCreateBy.html以简化您的逻辑。

Answer 2

我设法解决了这个问题。我必须将unique attributt放在one-to-one映射的子关系中，如下所示：

class A {
    def name
    static hasOne = [b:B]
    static constraints = { 
        // b unique: true <-- REMOVED
        name unique: true
    }
}

class B {
    A a
    static belongsTo = [A]
    static constraints = {
        a unique: true // <-- ADDED
    }
}

不确定原因，但确实有效。

Grails中的SQLException save（）方法

2 个答案: