/// <summary>
/// determine whether data has existed
/// </summary>
/// <param name="server">server</param>
/// <param name="cmd">command</param>
/// <returns>data has existed</returns>
public async Task <bool> QueryAsync(ServerInfo server, ICommand cmd)
{
var translator = QueryTranslator.GetTranslator(server);
#region query translate
var tranResult = translator.Translate(cmd.Query);
string conditionString = string.Empty;
if (!tranResult.ConditionString.IsNullOrEmpty())
{
conditionString += "WHERE " + tranResult.ConditionString;
}
string preScript = tranResult.PreScript;
string joinScript = tranResult.AllowJoin ? tranResult.JoinScript : string.Empty;
#endregion
var field = DataManager.GetDefaultField(ServerType.MySQL, cmd.EntityType);
string objectName = DataManager.GetEntityObjectName(ServerType.MySQL, cmd.EntityType, cmd.ObjectName);
string cmdText = string.Format("{5}SELECT EXISTS(SELECT {0}.`{1}` FROM `{2}` AS {0}{4} {3})"
, translator.ObjectPetName
, field.FieldName
, objectName
, conditionString
, joinScript
, preScript);
using (var conn = DbServerFactory.GetConnection(server))
{
var tran = GetQueryTransaction(conn, cmd.Query);
int value = await conn.ExecuteScalarAsync <int>(cmdText, tranResult.Parameters, transaction : tran).ConfigureAwait(false);
return(value > 0);
}
}
/// <summary>
/// query data list
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="server">database server</param>
/// <param name="cmd">command</param>
/// <returns>data list</returns>
public async Task <IEnumerable <T> > QueryAsync <T>(ServerInfo server, ICommand cmd)
{
if (cmd.Query == null)
{
throw new EZNEWException("ICommand.Query is null");
}
#region query object translate
IQueryTranslator translator = QueryTranslator.GetTranslator(server);
var tranResult = translator.Translate(cmd.Query);
string joinScript = tranResult.AllowJoin ? tranResult.JoinScript : string.Empty;
#endregion
#region execute
StringBuilder cmdText = new StringBuilder();
switch (cmd.Query.QueryType)
{
case QueryCommandType.Text:
cmdText.Append(tranResult.ConditionString);
break;
case QueryCommandType.QueryObject:
default:
int size = cmd.Query.QuerySize;
string objectName = DataManager.GetEntityObjectName(ServerType.MySQL, cmd.EntityType, cmd.ObjectName);
cmdText.AppendFormat("{3}SELECT {1} FROM `{2}` AS {0}{4}"
, translator.ObjectPetName
, string.Join(",", FormatQueryFields(translator.ObjectPetName, cmd.Query, cmd.EntityType, out var defaultFieldName))
, objectName
, tranResult.PreScript
, joinScript);
if (!tranResult.ConditionString.IsNullOrEmpty())
{
cmdText.AppendFormat(" WHERE {0}", tranResult.ConditionString);
}
if (!tranResult.OrderString.IsNullOrEmpty())
{
cmdText.AppendFormat(" ORDER BY {0}", tranResult.OrderString);
}
if (size > 0)
{
cmdText.AppendFormat(" LIMIT 0,{0}", size);
}
break;
}
#endregion
using (var conn = DbServerFactory.GetConnection(server))
{
var tran = GetQueryTransaction(conn, cmd.Query);
return(await conn.QueryAsync <T>(cmdText.ToString(), tranResult.Parameters, transaction : tran, commandType : GetCommandType(cmd as RdbCommand)).ConfigureAwait(false));
}
}
/// <summary>
/// execute commands
/// </summary>
/// <param name="server">db server</param>
/// <param name="executeCommands">execute commands</param>
/// <param name="useTransaction">use transaction</param>
/// <returns></returns>
async Task <int> ExecuteCommandAsync(ServerInfo server, IEnumerable <DbExecuteCommand> executeCommands, bool useTransaction)
{
int resultValue = 0;
bool success = true;
using (var conn = DbServerFactory.GetConnection(server))
{
conn.Open();
IDbTransaction transaction = null;
if (useTransaction)
{
transaction = conn.BeginTransaction();
}
try
{
foreach (var cmd in executeCommands)
{
var executeResultValue = await conn.ExecuteAsync(cmd.CommandText, ConvertCmdParameters(cmd.Parameters), transaction, commandType : cmd.CommandType).ConfigureAwait(false);
success = success && (cmd.ForceReturnValue ? executeResultValue > 0 : true);
resultValue += executeResultValue;
if (useTransaction && !success)
{
break;
}
}
if (!useTransaction)
{
return(resultValue);
}
if (success)
{
transaction.Commit();
}
else
{
resultValue = 0;
transaction.Rollback();
}
return(resultValue);
}
catch (Exception ex)
{
resultValue = 0;
transaction?.Rollback();
throw ex;
}
}
}
/// <summary>
/// query data
/// </summary>
/// <param name="server">database server</param>
/// <param name="cmd">query cmd</param>
/// <returns>data</returns>
public async Task <DataSet> QueryMultipleAsync(ServerInfo server, ICommand cmd)
{
using (var conn = DbServerFactory.GetConnection(server))
{
var tran = GetQueryTransaction(conn, cmd.Query);
DynamicParameters parameters = ConvertCmdParameters(ParseParameters(cmd.Parameters));
using (var reader = await conn.ExecuteReaderAsync(cmd.CommandText, parameters, transaction: tran, commandType: GetCommandType(cmd as RdbCommand)).ConfigureAwait(false))
{
DataSet dataSet = new DataSet();
while (!reader.IsClosed && reader.Read())
{
DataTable dataTable = new DataTable();
dataTable.Load(reader);
dataSet.Tables.Add(dataTable);
}
return(dataSet);
}
}
}
/// <summary>
/// query single value
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="server">database server</param>
/// <param name="cmd">command</param>
/// <returns>query data</returns>
public async Task <T> AggregateValueAsync <T>(ServerInfo server, ICommand cmd)
{
if (cmd.Query == null)
{
throw new EZNEWException("ICommand.Query is null");
}
#region query object translate
IQueryTranslator translator = QueryTranslator.GetTranslator(server);
var tranResult = translator.Translate(cmd.Query);
#endregion
#region query
StringBuilder cmdText = new StringBuilder();
string joinScript = tranResult.AllowJoin ? tranResult.JoinScript : string.Empty;
switch (cmd.Query.QueryType)
{
case QueryCommandType.Text:
cmdText.Append(tranResult.ConditionString);
break;
case QueryCommandType.QueryObject:
default:
string funcName = GetAggregateFunctionName(cmd.Operate);
if (funcName.IsNullOrEmpty())
{
return(default(T));
}
#region field
EntityField field = null;
if (AggregateOperateMustNeedField(cmd.Operate))
{
if (cmd.Query.QueryFields.IsNullOrEmpty())
{
throw new EZNEWException(string.Format("You must specify the field to perform for the {0} operation", funcName));
}
else
{
field = DataManager.GetField(ServerType.MySQL, cmd.EntityType, cmd.Query.QueryFields[0]);
}
}
else
{
field = DataManager.GetDefaultField(ServerType.MySQL, cmd.EntityType);
}
#endregion
string objectName = DataManager.GetEntityObjectName(ServerType.MySQL, cmd.EntityType, cmd.ObjectName);
cmdText.AppendFormat("{4}SELECT {0}({1}) FROM `{2}` AS {3}{5}"
, funcName
, FormatField(translator.ObjectPetName, field)
, objectName
, translator.ObjectPetName
, tranResult.PreScript
, joinScript
);
if (!tranResult.ConditionString.IsNullOrEmpty())
{
cmdText.AppendFormat(" WHERE {0}", tranResult.ConditionString);
}
if (!tranResult.OrderString.IsNullOrEmpty())
{
cmdText.AppendFormat(" ORDER BY {0}", tranResult.OrderString);
}
break;
}
#endregion
using (var conn = DbServerFactory.GetConnection(server))
{
var tran = GetQueryTransaction(conn, cmd.Query);
return(await conn.ExecuteScalarAsync <T>(cmdText.ToString(), tranResult.Parameters, transaction : tran, commandType : GetCommandType(cmd as RdbCommand)).ConfigureAwait(false));
}
}
/// <summary>
/// query data list offset the specified numbers
/// </summary>
/// <typeparam name="T">data type</typeparam>
/// <param name="server">database server</param>
/// <param name="cmd">command</param>
/// <param name="offsetNum">offset num</param>
/// <param name="size">query size</param>
/// <returns></returns>
public async Task <IEnumerable <T> > QueryOffsetAsync <T>(ServerInfo server, ICommand cmd, int offsetNum = 0, int size = int.MaxValue)
{
if (cmd.Query == null)
{
throw new EZNEWException("ICommand.Query is null");
}
#region query object translate
IQueryTranslator translator = QueryTranslator.GetTranslator(server);
var tranResult = translator.Translate(cmd.Query);
#endregion
#region execute
string joinScript = tranResult.AllowJoin ? tranResult.JoinScript : string.Empty;
StringBuilder cmdText = new StringBuilder();
switch (cmd.Query.QueryType)
{
case QueryCommandType.Text:
cmdText.Append(tranResult.ConditionString);
break;
case QueryCommandType.QueryObject:
default:
string conditionString = string.Empty;
string orderString = string.Empty;
string limitString = string.Empty;
string objectName = DataManager.GetEntityObjectName(ServerType.MySQL, cmd.EntityType, cmd.ObjectName);
string defaultFieldName = string.Empty;
List <string> formatQueryFields = FormatQueryFields(translator.ObjectPetName, cmd.Query, cmd.EntityType, out defaultFieldName);
if (!tranResult.ConditionString.IsNullOrEmpty())
{
conditionString = string.Format(" WHERE {0}", tranResult.ConditionString);
}
if (!tranResult.OrderString.IsNullOrEmpty())
{
orderString = string.Format(" ORDER BY {0}", tranResult.OrderString);
}
limitString = string.Format(" LIMIT {0},{1}", offsetNum, size);
cmdText.AppendFormat("{7}SELECT (SELECT COUNT({3}.`{0}`) FROM `{2}` AS {3}{8} {4}) AS QueryDataTotalCount,{1} FROM `{2}` AS {3}{8} {4} {5} {6}"
, defaultFieldName
, string.Join(",", formatQueryFields)
, objectName
, translator.ObjectPetName
, conditionString
, orderString
, limitString
, tranResult.PreScript
, joinScript);
break;
}
#endregion
using (var conn = DbServerFactory.GetConnection(server))
{
var tran = GetQueryTransaction(conn, cmd.Query);
return(await conn.QueryAsync <T>(cmdText.ToString(), tranResult.Parameters, transaction : tran, commandType : GetCommandType(cmd as RdbCommand)).ConfigureAwait(false));
}
}
