public override string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args, string primaryKey = null)
{
parts.sqlSelectRemoved = PagingHelper.rxOrderBy.Replace(parts.sqlSelectRemoved, "", 1);
if (PagingHelper.rxDistinct.IsMatch(parts.sqlSelectRemoved))
{
parts.sqlSelectRemoved = "peta_inner.* FROM (SELECT " + parts.sqlSelectRemoved + ") peta_inner";
}
string text = primaryKey ?? string.Empty;
if (primaryKey.Contains('.') && !primaryKey.EndsWith("."))
{
text = primaryKey.Substring(primaryKey.LastIndexOf(".") + 1);
}
string result = string.Format("SELECT peta_paged.{4} FROM (SELECT ROW_NUMBER() OVER ({0}) peta_rn, {1}) peta_paged WHERE peta_rn>@{2} AND peta_rn<=@{3}", new object[]
{
(parts.sqlOrderBy == null) ? "ORDER BY (SELECT NULL)" : parts.sqlOrderBy,
parts.sqlSelectRemoved,
args.Length,
args.Length + 1,
text
});
args = args.Concat(new object[]
{
skip,
skip + take
}).ToArray<object>();
return result;
}
public override string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args, string primaryKey = null)
{
if (parts.sqlSelectRemoved.StartsWith("*"))
{
throw new System.Exception("Query must alias '*' when performing a paged query.\neg. select t.* from table t order by t.id");
}
return Singleton<SqlServerDatabaseType>.Instance.BuildPageQuery(skip, take, parts, ref args, null);
}
public virtual string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args, string primaryKey = null)
{
string result = string.Format("{0}\nLIMIT @{1} OFFSET @{2}", parts.sql, args.Length, args.Length + 1);
args = args.Concat(new object[]
{
take,
skip
}).ToArray<object>();
return result;
}
public override string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args)
{
parts.sqlSelectRemoved = PagingHelper.rxOrderBy.Replace(parts.sqlSelectRemoved, "", 1);
if (PagingHelper.rxDistinct.IsMatch(parts.sqlSelectRemoved))
{
parts.sqlSelectRemoved = "peta_inner.* FROM (SELECT " + parts.sqlSelectRemoved + ") peta_inner";
}
var sqlPage = string.Format("SELECT * FROM (SELECT ROW_NUMBER() OVER ({0}) peta_rn, {1}) peta_paged WHERE peta_rn>@{2} AND peta_rn<=@{3}",
parts.sqlOrderBy == null ? "ORDER BY (SELECT NULL)" : parts.sqlOrderBy, parts.sqlSelectRemoved, args.Length, args.Length + 1);
args = args.Concat(new object[] { skip, skip + take }).ToArray();
return sqlPage;
}
public static bool SplitSQL(string sql, out PagingHelper.SQLParts parts)
{
parts.sql = sql;
parts.sqlSelectRemoved = null;
parts.sqlCount = null;
parts.sqlOrderBy = null;
Match match = PagingHelper.rxColumns.Match(sql);
if (!match.Success)
{
return false;
}
Group group = match.Groups[1];
parts.sqlSelectRemoved = sql.Substring(group.Index);
if (PagingHelper.rxDistinct.IsMatch(parts.sqlSelectRemoved))
{
parts.sqlCount = string.Concat(new string[]
{
sql.Substring(0, group.Index),
"COUNT(",
match.Groups[1].ToString().Trim(),
") ",
sql.Substring(group.Index + group.Length)
});
}
else
{
parts.sqlCount = sql.Substring(0, group.Index) + "COUNT(*) " + sql.Substring(group.Index + group.Length);
}
match = PagingHelper.rxOrderBy.Match(parts.sqlCount);
if (!match.Success)
{
parts.sqlOrderBy = null;
}
else
{
group = match.Groups[0];
parts.sqlOrderBy = group.ToString();
parts.sqlCount = parts.sqlCount.Substring(0, group.Index) + parts.sqlCount.Substring(group.Index + group.Length);
}
return true;
}
/// <summary>
/// Builds an SQL query suitable for performing page based queries to the database
/// </summary>
/// <param name="skip">The number of rows that should be skipped by the query</param>
/// <param name="take">The number of rows that should be retruend by the query</param>
/// <param name="parts">The original SQL query after being parsed into it's component parts</param>
/// <param name="args">Arguments to any embedded parameters in the SQL query</param>
/// <returns>The final SQL query that should be executed.</returns>
public virtual string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args)
{
var sql = string.Format("{0}\nLIMIT @{1} OFFSET @{2}", parts.sql, args.Length, args.Length + 1);
args = args.Concat(new object[] { take, skip }).ToArray();
return sql;
}
public override string BuildPageQuery(long skip, long take, PagingHelper.SQLParts parts, ref object[] args)
{
var sqlPage = string.Format("{0}\nOFFSET @{1} ROWS FETCH NEXT @{2} ROWS ONLY", parts.sql, args.Length, args.Length + 1);
args = args.Concat(new object[] { skip, take }).ToArray();
return sqlPage;
}