Question

我正在尝试运行一些特定于postgres的sql，并希望在Exposed中重用事务管理。

Answer 1

在Kiskae的回答的帮助下，我能够运行原始sql：

Sub GetKeyRatios()
Dim URL As String, csv As String, Lines, Values
Dim i As Long, j As Long, WinHttpReq As Object
Dim rngStart As Range

URL = "http://financials.morningstar.com/ajax/exportKR2CSV.html?&callback=?&t=XNYS:JNJ&region=usa&culture=en-US&cur=USD&order=asc"

Set WinHttpReq = CreateObject("Microsoft.XMLHTTP")
WinHttpReq.Open "GET", URL, False
WinHttpReq.send

csv = WinHttpReq.responseText

Lines = Split(csv, vbLf)

Set rngPaste = Sheets("KeyRatios").Range("A1")

For i = 0 To UBound(Lines)
    Values = Split(Lines(i), ",")
    For j = 0 To UBound(Values)
        rngPaste.Offset(i, j).Value = Values(j)
    Next j
Next i
End Sub

Answer 2

Exposed有Transaction.exec(String)方法可能会做你想要的。见https://github.com/JetBrains/Exposed/blob/master/src/test/kotlin/org/jetbrains/exposed/sql/tests/mysql/MysqlTests.kt

Answer 3

import java.sql.*
import org.jetbrains.exposed.sql.*
import org.jetbrains.exposed.sql.transactions.*

fun getAccId(db : Database, acc_domain: String) {
  transaction(db) {
    addLogger(StdOutSqlLogger)
    var acc_id: Long = 0
    exec("select id from accounts where domain = '${acc_domain}'") { rs ->
        while(rs.next()) {
          acc_id = rs.getLong("id")
        }
    }
    println("Acc Id is ${acc_id}")
  }
}

val database = Database.connect(datasource)
getAccId(database,"mytest.test.io")

Answer 4

下面是带有参数的示例：

transaction(database) {
   val conn = TransactionManager.current().connection
   val query = "update user set name = ? where id = ?";
   val statement = conn.prepareStatement(query, false)
   statement.fillParameters(listOf(Pair(VarCharColumnType(), "Laura"),
      Pair(IntegerColumnType(), 3)));
   statement.executeUpdate()
}

Answer 5

您可以创建一个简单的辅助函数，例如：

 String.execAndMap(transform : (ResultSet) -> T) : List {
         val result = arrayListOf()
         TransactionManager.current().exec(this) { rs ->
              while (rs.next()) {
                   result += transform(rs)
              }
         }
         return result
    }

    "select u.name, c.name from user u inner join city c where blah blah".execAndMap { rs ->
        rs.getString("u.name") to rs.getString("c.name") 
    }

来自：https://github.com/JetBrains/Exposed/wiki/FAQ#q-is-it-possible-to-use-native-sql--sql-as-a-string

有没有办法用Kotlin的Exposed库运行原始sql

5 个答案: