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using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace QueryTree.Engine
{
public enum DatabaseType
{
MySQL = 0,
PostgreSQL = 3,
SQLServer = 1
}
public abstract class NodeBase
{
public DatabaseType DatabaseType = DatabaseType.MySQL;
public string ClientId { get; set; }
protected List<int> SortColumnIndexes = new List<int>() { 0 };
protected List<bool> SortDirections = new List<bool>() { true }; // True == ascending
/// <summary>
/// Returns a SQL query which will be used to define a view. This view
/// will be selected from by the NodeBase.get_select_sql code.The
/// results of that will be passed via the process_data method before
/// being returned to the client
/// </summary>
/// <returns>The query string.</returns>
public abstract string GetQuerySql();
public abstract bool IsConfigured();
public virtual void UpdateSettings(Dictionary<string, object> settings)
{
}
protected string GetSortColumns()
{
return String.Join(",", Enumerable.Range(0, SortColumnIndexes.Count).Select(i => string.Format("Column_{0:D} {1}", SortColumnIndexes[i], GetSortDirection(i))));
}
protected string QuoteName(string name)
{
switch (DatabaseType)
{
case DatabaseType.SQLServer:
return "[" + name + "]";
case DatabaseType.PostgreSQL:
return "\"" + name + "\"";
default:
return "`" + name + "`";
}
}
protected virtual string GetSelectColumns()
{
var i = 0;
return String.Join(",", GetColumns().Select(c => string.Format("Column_{0:D} AS {1}", i++, QuoteName(c))));
}
protected string GetSortDirection(int i)
{
if (SortDirections.Count > i && SortDirections[i])
{
return "ASC";
}
else
{
return "DESC";
}
}
protected bool IsNumberType(string colType)
{
var numericDataTypes = new List<string>() { "INTEGER", "INT", "SMALLINT", "TINYINT", "MEDIUMINT", "BIGINT", "DECIMAL", "NUMERIC", "FLOAT", "DOUBLE", "REAL", "MONEY", "SMALLMONEY", "DOUBLE PRECISION", "SMALLSERIAL", "SERIAL", "BIGSERIAL" };
switch (DatabaseType) {
case DatabaseType.PostgreSQL:
// POSTGRES TYPES = ["SMALLINT", "INTEGER", "BIGINT", "DECIMAL", "NUMERIC", "REAL", "DOUBLE PRECISION", "SMALLSERIAL", "SERIAL", "BIGSERIAL", "MONEY"]
case DatabaseType.SQLServer:
case DatabaseType.MySQL:
return numericDataTypes.Contains(colType.ToUpper());
}
return false;
}
protected bool IsTextType(string colType)
{
var quotedTypes = new List<string>() { "VARCHAR", "NVARCHAR", "CHAR", "NCHAR", "ENUM", "XML", "CHARACTER VARYING", "CHARACTER", "TEXT", "USER-DEFINED", "LONGTEXT" };
switch (DatabaseType)
{
case DatabaseType.PostgreSQL:
// # POSTGRES TYPES = ["CHARACTER VARYING", "VARCHAR", "CHARACTER", "CHAR", "TEXT", "TIMESTAMP WITHOUT TIME ZONE", "TIMESTAMP WITH TIME ZONE", "DATE", "TIME WITHOUT TIME ZONE", "TIME WITH TIME ZONE", "INTERVAL", "USER-DEFINED"]
case DatabaseType.SQLServer:
case DatabaseType.MySQL:
return quotedTypes.Contains(colType.ToUpper());
}
return false;
}
protected bool IsBoolType(string colType)
{
var quotedTypes = new List<string>() { "BIT", "BOOL", "BOOLEAN" };
switch (DatabaseType)
{
case DatabaseType.PostgreSQL:
case DatabaseType.SQLServer:
case DatabaseType.MySQL:
return quotedTypes.Contains(colType.ToUpper());
}
return false;
}
protected bool IsQuotedType(string colType)
{
return IsTextType(colType) || IsDateType(colType);
}
protected bool IsDateType(string colType)
{
var dateTypes = new List<string>() { "DATE", "DATETIME", "TIMESTAMP WITHOUT TIME ZONE", "TIMESTAMP", "TIMESTAMP WITH TIME ZONE", "TIME WITHOUT TIME ZONE", "TIME WITH TIME ZONE", "INTERVAL" };
switch (DatabaseType)
{
case DatabaseType.PostgreSQL:
// # POSTGRES TYPES = ["TIMESTAMP WITHOUT TIME ZONE", "TIMESTAMP WITH TIME ZONE", "DATE", "TIME WITHOUT TIME ZONE", "TIME WITH TIME ZONE", "INTERVAL"]
case DatabaseType.SQLServer:
case DatabaseType.MySQL:
return dateTypes.Contains(colType.ToUpper());
}
return false;
}
protected bool IsCaseTyoStringType(string colType)
{
var castToStringTypes = new List<string>() { "XML", "USER-DEFINED" };
switch (DatabaseType)
{
case DatabaseType.PostgreSQL:
case DatabaseType.SQLServer:
case DatabaseType.MySQL:
return castToStringTypes.Contains(colType.ToUpper());
}
return false;
}
protected virtual string GetSelectSql(int? count = null, int? skip = null)
{
var sql = string.Format("SELECT * FROM {0}", GetNodeAlias());
if (count.HasValue && skip.HasValue)
{
sql += string.Format(" LIMIT {0:D},{1:D}", skip, count);
}
return sql;
}
internal virtual string GetColumnName(int colNumber)
{
return string.Format("{0}.Column_{1:D}", GetNodeAlias(), colNumber);
}
internal virtual string GetNodeAlias()
{
return string.Format("node_{0}", ClientId.Replace("-", "_"));
}
internal virtual string GetTableAlias()
{
return string.Format("table_{0}", ClientId.Replace("-", "_"));
}
public virtual IList<string> GetColumns()
{
throw new NotImplementedException("Derived classes should implement the GetColumns method");
}
public virtual IList<string> GetColumnTypes()
{
throw new NotImplementedException("Derived classes should implement the GetColumnTypes method");
}
private static string BuildWithSql(IEnumerable<NodeBase> orderedUpstreamDependencies)
{
var query = new StringBuilder("WITH ");
var separator = "";
foreach (var dependency in orderedUpstreamDependencies)
{
query.AppendFormat("{0}{1} AS ({2})", separator, dependency.GetNodeAlias(), dependency.GetQuerySql());
separator = ",";
}
return query.ToString();
}
internal virtual void FetchOrderedDependencies(IList<NodeBase> dependencies)
{
if (dependencies.Contains(this))
{
dependencies.Remove(this);
}
dependencies.Insert(0, this);
}
public string GetFetchDataQuery(int? startRow = null, int? rowCount = null)
{
var query = new StringBuilder();
if (DatabaseType == DatabaseType.MySQL)
{
query.AppendFormat("SELECT {0} FROM ({1} ORDER BY {2}) AS results",
GetSelectColumns(),
GetQuerySql(),
GetSortColumns());
if (startRow.HasValue && rowCount.HasValue)
{
query.AppendFormat(" LIMIT {0:D}, {1:D}", startRow, rowCount);
}
}
else if (DatabaseType == DatabaseType.SQLServer || DatabaseType == DatabaseType.PostgreSQL)
{
IList<NodeBase> nodes = new List<NodeBase>();
FetchOrderedDependencies(nodes);
query.Append(BuildWithSql(nodes));
if (startRow.HasValue && rowCount.HasValue)
{
// In order for this to work, we will need a ROW_NUMBER column in the CTE, which we
// don"t select in the following query but which we use in a "WHERE row_num BETWEEN x AND y"
// clause. To make this work we"ll need all nodes to have a default sort column which
// we put into the ROW_NUMBER"s ORDER BY clause. The Sort node would then override that sort
// column with the user selected column
query.AppendFormat(",{0}_with_row_num AS (SELECT *, ROW_NUMBER() OVER (ORDER BY {1}) AS ROW_NUM FROM {2})",
GetNodeAlias(),
GetSortColumns(),
GetNodeAlias());
query.AppendFormat("SELECT {0} FROM {1}_with_row_num WHERE row_num BETWEEN {2:D} AND {3:D}",
GetSelectColumns(),
GetNodeAlias(),
startRow.Value + 1, startRow.Value + rowCount.Value);
}
else
{
query.AppendFormat("SELECT {0} FROM {1}",
GetSelectColumns(),
GetNodeAlias());
}
query.AppendFormat(" ORDER BY {0}", GetSortColumns());
}
return query.ToString();
}
public string GetCountQuerySql()
{
var query = new StringBuilder();
if (DatabaseType == DatabaseType.SQLServer || DatabaseType == DatabaseType.PostgreSQL)
{
IList<NodeBase> nodes = new List<NodeBase>();
FetchOrderedDependencies(nodes);
query.Append(BuildWithSql(nodes));
}
query.AppendFormat("SELECT COUNT(*) FROM ({0}) as {1}", GetQuerySql(), GetNodeAlias());
return query.ToString();
}
internal string GetDependencySql()
{
if (DatabaseType == DatabaseType.SQLServer || DatabaseType == DatabaseType.PostgreSQL)
{
return GetNodeAlias();
}
else
{
return string.Format("({0}) AS {1}", GetQuerySql(), GetNodeAlias());
}
}
}
}