ColumnConvertible

public protocol ColumnConvertible

A type that can be initialized directly from a column in an SQLite result row.

The implementation should use one of the sqlite_column_X() functions documented at Result Values From A Query.

For example, the implementation for Int64 is:

extension Int64: ColumnConvertible {
    public init(_ stmt: SQLitePreparedStatement, column idx: Int32) {
       self = sqlite3_column_int64(stmt, idx)
    }
}


                    
                    
                    init(_:column:)

Creates an instance containing the value of column idx in stmt.

Note

Column indexes are 0-based. The leftmost column in a row has index 0.

Precondition

sqlite3_column_type(stmt, idx) != SQLITE_NULL

Throws

An error if initialization fails

Declaration

Swift

init(_ stmt: SQLitePreparedStatement, column idx: Int32) throws

Parameters

`stmt`	An `sqlite3_stmt *` object
`idx`	The index of the desired column