/// <summary>
/// SQL文を生成する
/// </summary>
/// <param name="context">生成先のコンテキスト</param>
public void ToElementCode(ElementCode context)
{
var delayedCode = new DelayedCodeGenerator((wb) => {
var ec = new ElementCode();
ec.BeginParenthesize();
ec.Add(SqlKeyword.Values);
var list = this.List;
for (int i = 0, n = list.Count; i < n; i++)
{
if (i != 0)
{
ec.AddComma();
}
ec.BeginParenthesize();
ec.AddValues <TColumns>(list[i]);
ec.EndParenthesize();
}
ec.EndParenthesize();
ec.Add(this);
ec.BeginParenthesize();
ec.AddColumns(this.ColumnMap, column => ec.Concat(column.Name));
ec.EndParenthesize();
ec.Build(wb);
});
context.Add(delayedCode);
context.RegisterBuildHandler(this, (item, wb) => {
// delayedCode 内でエイリアス名付与するので、既存の処理をオーバーライドし何もしないようにする
});
}
/// <summary>
/// 同一値が存在しない場合のみ挿入するように判定を追加する
/// </summary>
/// <param name="columnCountToWhere">NOT EXISTS (SELECT * FROM t WHERE t.Name = "test") の部分で判定に使用する列数、0が指定されたら全て使用する</param>
public void IfNotExists(int columnCountToWhere = 0)
{
var valueSetter = this.ValueNode as ValueSetter;
if (valueSetter != null)
{
if (columnCountToWhere <= 0 || this.ColumnMap.Count < columnCountToWhere)
{
columnCountToWhere = this.ColumnMap.Count;
}
// WHERE NOT EXISTS部作成
var notExistsSelectFrom = new ElementCode();
var columnMap = this.ColumnMap;
notExistsSelectFrom.Add(SqlKeyword.NotExists);
notExistsSelectFrom.BeginParenthesize();
notExistsSelectFrom.Add(SqlKeyword.Select, SqlKeyword.Asterisk, SqlKeyword.From);
notExistsSelectFrom.Add(this.Table);
notExistsSelectFrom.Add(SqlKeyword.Where);
for (int i = 0; i < columnCountToWhere; i++)
{
if (i != 0)
{
notExistsSelectFrom.Add(SqlKeyword.And);
}
notExistsSelectFrom.Add(columnMap[i]);
notExistsSelectFrom.Concat("=");
notExistsSelectFrom.Add(valueSetter.ColumnMap[i].Source);
}
notExistsSelectFrom.EndParenthesize();
valueSetter.Where(notExistsSelectFrom);
}
}
public void NotExistsSelect <TColumns>(TColumns columns, Expression <Func <TColumns, bool> > selectWhereExpression)
{
var expression = new ElementCode(selectWhereExpression, this.Owner.AllColumns, columns);
var table = expression.FindTables().FirstOrDefault();
if (table == null)
{
throw new ApplicationException();
}
var whereExpression = new ElementCode();
whereExpression.Add(SqlKeyword.NotExists);
whereExpression.BeginParenthesize();
whereExpression.Add(SqlKeyword.Select, SqlKeyword.Asterisk, SqlKeyword.From);
whereExpression.Add(table);
whereExpression.Add(SqlKeyword.Where);
whereExpression.Add(expression);
whereExpression.EndParenthesize();
this.Expression = whereExpression;
}
