Question

我有这样的场景：

我需要从select中更新批处理中的某些行，这是我的近似代码

String queryText = "select " + config.fields.join(",") +" from myTable where myfield > 0"

String updateSqlText = "update otherTable set ("+ config.oterhTable.fields.join("=?,") + " ) where ID=?";

// just an example for insert
String insertSqlText = "insert into otherTable ("+ config.oterhTable.fields.join(",") + " ) values (?,?,?,?,?,?,?,?,?,? ...)";

def updateCounts = otherSql.withBatch(100, updateSqlText) { ps ->
    riskSql.eachRow(queryText){ row ->

    if (row.ID == 0){
            // this doesn't work, but I want to do something similar
            otherSql.execute(insertSqlText, row)
        } else {
            // this doesn't work, I need to convert to list. The error I get: aught: java.sql.SQLException: Unable to convert between com.sun.proxy.$Proxy6 and JAVA_OBJECT
            ps.addBatch(row, row.SUD_ID)
        }
    }
}

queryText的查询结果很大，因此我无法调用.rows（）来获取结果列表。是否有更简单的方法来列出行闭包？基本上我需要那里的所有字段来映射到我准备好的陈述。

Answer 1

<强>更新这是一个避免使用eachRow的解决方案，而是使用带有页面和偏移量的rows。这应该可以避免大的结果集问题。

    def count = sql.firstRow('select count(*) as c from <table>').c
    def page = 0
    def pageSize = 10

    while (page * pageSize < count) {
        sql.rows('select * from <table>', page, pageSize).each { GroovyRowResult row ->
            def values = row.collect { key, value -> value }
            println values  // <- values is a List
        }
        ++page
    }

从select的结果填充更新语句

1 个答案: