public SqliteTable <T> WithoutMissingColumns(SqliteDatabase database)
{
var columns = new List <string>();
using (var reader = database.Read($"PRAGMA table_info({TableName})"))
{
while (reader.TryRead())
{
var column = reader.ColumnText(1);
if (column != null)
{
columns.Add(column);
}
}
}
if (columns.Count < 1)
{
throw new MissingTableException($"Table '{TableName}' does not exist.");
}
var properties = ImmutableArray.CreateRange(_properties.Where(p => columns.Contains(p.ColumnName)));
var keyProperties = ImmutableArray.CreateRange(_keyProperties.Where(p => columns.Contains(p.ColumnName)));
if (properties.IsDefaultOrEmpty)
{
throw new MissingTableException($"Table '{TableName}' has the wrong schema.");
}
return(new SqliteTable <T>(TableName, properties, keyProperties));
}
public IEnumerable <KeyValuePair <long, T2> > ValuesWithRowId <T2>(
SqliteDatabase database,
Func <T2> generator,
Action <QueryBuilder>?extendQuery = null) where T2 : T
{
var builder = new QueryBuilder($"`{TableName}`")
.Select(p => $"`{p.ColumnName}`", _properties)
.Select("`rowid`");
extendQuery?.Invoke(builder);
using (var reader = database.Read(builder.ToString()))
{
while (reader.TryRead())
{
var item = generator();
int index = 0;
foreach (var property in _properties)
{
property.PropertyHandler.LoadRecord(reader, index++, item);
}
long rowId = reader.ColumnInt64(index++);
yield return(KeyValuePair.Create(rowId, item));
}
}
}
public void AddMissingColumns(SqliteDatabase database)
{
CreateTable(database);
var currentFields = new HashSet <string>();
using (var reader = database.Read($"PRAGMA table_info({TableName})"))
{
while (reader.TryRead())
{
var column = reader.ColumnText(1);
if (column != null)
{
currentFields.Add(column);
}
}
}
var missingFields = new List <SqliteProperty <T> >(_properties);
missingFields.RemoveAll(p => currentFields.Contains(p.ColumnName));
var builder = new StringBuilder();
foreach (var field in missingFields)
{
builder.Length = 0;
builder
.Append("ALTER TABLE ")
.AppendField(TableName)
.Append(" ADD COLUMN ")
.AppendProperty(field);
database.Execute(builder.ToString());
}
}
public IEnumerable <T2> Values <T2>(
SqliteDatabase database,
Func <T2> generator,
Action <QueryBuilder>?extendQuery = null) where T2 : T
{
var builder = new QueryBuilder($"`{TableName}`")
.Select(p => $"`{p.ColumnName}`", _properties);
extendQuery?.Invoke(builder);
using (var reader = database.Read(builder.ToString()))
{
while (reader.TryRead())
{
var item = generator();
int index = 0;
foreach (var property in _properties)
{
property.PropertyHandler.LoadRecord(reader, index++, item);
}
yield return(item);
}
}
}
