/// <summary>
/// 添加所有数据字段名并返回当前SQL语句创建类
/// </summary>
/// <param name="isDistinct">是否选择语句唯一</param>
/// <param name="queryFields">数据字段名</param>
/// <returns>当前SQL语句创建类</returns>
internal SqlCommandBuilder AppendAllColumnNames(Boolean isDistinct, List <SqlQueryField> queryFields)
{
if (queryFields != null && queryFields.Count > 0)
{
StringBuilder names = new StringBuilder();
for (Int32 i = 0; i < queryFields.Count; i++)
{
if (i > 0)
{
names.Append(",");
}
SqlQueryField queryField = queryFields[i];
if (queryField.UseFunction)
{
names.Append(queryField.Function);
}
if (!String.IsNullOrEmpty(queryField.FieldName))
{
if (queryField.UseFunction)
{
names.Append('(');
if (queryField.UseDistinct)
{
names.Append("DISTINCT ");
}
}
if (!String.IsNullOrEmpty(queryField.TableName))
{
names.Append(queryField.TableName).Append('.');
}
names.Append(queryField.FieldName);
if (queryField.UseFunction)
{
names.Append(')');
}
}
if (!String.IsNullOrEmpty(queryField.AliasesName))
{
names.Append(" AS ").Append(queryField.AliasesName);
}
}
this._stringBuilder.Append(names.ToString()).Append(' ');
}
else
{
this._stringBuilder.Append("* ");
}
return(this);
}
/// <summary>
/// 查询指定字段名并返回当前语句
/// </summary>
/// <param name="queryFields">要查询的字段名集合</param>
/// <returns>当前语句</returns>
public SelectCommand Querys(params String[] queryFields)
{
if (queryFields != null)
{
for (Int32 i = 0; i < queryFields.Length; i++)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromColumn(queryFields[i]));
}
}
return(this);
}
/// <summary>
/// 查询指定函数语句并返回当前语句
/// </summary>
/// <param name="function">函数</param>
/// <param name="aliasesName">别名</param>
/// <exception cref="ArgumentNullException">函数不能为空</exception>
/// <returns>当前语句</returns>
public SelectCommand Query(ISqlFunction function, String aliasesName)
{
if (function == null)
{
throw new ArgumentNullException("function");
}
this._queryFields.Add(SqlQueryField.InternalCreateFromFunction(function.ToString(this.DatabaseType), aliasesName));
if (function.HasParameters)
{
this._parameters.AddRange(function.GetAllParameters());
}
return(this);
}
/// <summary>
/// 查询插入最后一条记录的ID并返回当前语句
/// </summary>
/// <exception cref="DatabaseNotSupportException">Oracle数据库不支持获取最后一条记录的ID</exception>
/// <returns>当前语句</returns>
public SelectCommand QueryIdentity()
{
if (this.DatabaseType == DatabaseType.SQLite)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromFunction("LAST_INSERT_ROWID()"));
}
else if (this.DatabaseType == DatabaseType.Oracle)
{
throw new DatabaseNotSupportException("Oracle database does not support identity.");
}
else
{
this._queryFields.Add(SqlQueryField.InternalCreateFromFunction("@@IDENTITY"));
}
return(this);
}
/// <summary>
/// 查询指定选择语句并返回当前语句
/// </summary>
/// <param name="command">选择语句</param>
/// <param name="aliasesName">别名</param>
/// <exception cref="ArgumentNullException">选择语句不能为空</exception>
/// <returns>当前语句</returns>
public SelectCommand Query(SelectCommand command, String aliasesName)
{
if (command == null)
{
throw new ArgumentNullException("function");
}
this._queryFields.Add(SqlQueryField.InternalCreateFromFunction(command.ToString(true), aliasesName));
List <SqlParameter> parameters = command.GetAllParameters();
if (parameters != null)
{
this._parameters.AddRange(parameters);
}
return(this);
}
/// <summary>
/// 判断两个Sql查询字段是否相同
/// </summary>
/// <param name="obj">待比较的Sql查询字段</param>
/// <returns>两个Sql查询字段是否相同</returns>
public override Boolean Equals(Object obj)
{
if (obj == null)
{
return(false);
}
SqlQueryField queryField = obj as SqlQueryField;
if (queryField == null)
{
return(false);
}
if (!String.Equals(this._tableName, queryField._tableName))
{
return(false);
}
if (!String.Equals(this._columnName, queryField._columnName))
{
return(false);
}
if (!String.Equals(this._aliasesName, queryField._aliasesName))
{
return(false);
}
if (_useFunction != queryField._useFunction)
{
return(false);
}
if (!String.Equals(this._function, queryField._function))
{
return(false);
}
return(true);
}
/// <summary>
/// 查询指定合计函数并返回当前语句
/// </summary>
/// <param name="function">合计函数类型</param>
/// <returns>当前语句</returns>
public SelectCommand Query(SqlAggregateFunction function)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromAggregateFunction(function));
return(this);
}
/// <summary>
/// 查询指定合计函数并返回当前语句
/// </summary>
/// <param name="tableName">表格名称</param>
/// <param name="function">合计函数类型</param>
/// <param name="fieldName">要查询的字段名</param>
/// <returns>当前语句</returns>
public SelectCommand Query(String tableName, SqlAggregateFunction function, String fieldName)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromAggregateFunction(tableName, function, fieldName));
return(this);
}
/// <summary>
/// 查询指定字段名并返回当前语句
/// </summary>
/// <param name="queryField">要查询的字段名</param>
/// <returns>当前语句</returns>
public SelectCommand Query(String queryField)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromColumn(queryField));
return(this);
}
/// <summary>
/// 查询指定字段名并返回当前语句
/// </summary>
/// <param name="tableName">表格名称</param>
/// <param name="queryField">要查询的字段名</param>
/// <param name="aliasesName">字段名的别名</param>
/// <returns>当前语句</returns>
public SelectCommand Query(String tableName, String queryField, String aliasesName)
{
this._queryFields.Add(SqlQueryField.InternalCreateFromColumn(tableName, queryField, aliasesName));
return(this);
}