Created
March 15, 2019 11:06
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Order by distance function for JetBrains Exposed.
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import org.jetbrains.exposed.sql.* | |
fun Query.orderByDistance( | |
columnX: Column<Double>, | |
columnY: Column<Double>, | |
compareX: Double, | |
compareY: Double, | |
order: SortOrder = SortOrder.ASC | |
): Query = this.orderBy(object : Expression<Int>() { | |
override fun toSQL(queryBuilder: QueryBuilder): String = buildString { | |
// Distance function | |
append("ST_DISTANCE(") // st_distance start | |
// Stored point | |
append("POINT(") // point start | |
append(columnX.toSQL(queryBuilder)) // point arg1 | |
append(",") // point divide | |
append(columnY.toSQL(queryBuilder)) // point arg2 | |
append(")") // point end | |
append(",") // st_distance divide | |
// Compare point | |
append("POINT(") // point start | |
append(compareX) // point arg1 | |
append(",") // point divide | |
append(compareY) // point arg2 | |
append(")") // point end | |
append(")") // st_distance end | |
} | |
} to order) |
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