protected Command GetCommand <T>(string cmdName) where T : class
{
MapperBuilder mb = new MapperBuilder(_parameterPrefix).Build <T>(cmdName);
Command cmd = new Command()
{
Text = mb.Sql
};
return(cmd);
}
public Command Build <T>(string cmdName, Expression <Func <T, bool> > predicate, IDictionary <string, object> dynParameters, OrderBy orderBy)
where T : class
{
Command cmd = new Command();
MapperBuilder mb = new MapperBuilder(_parameterPrefix).Build <T>(cmdName);
cmd.Text = mb.Sql;
//解析过滤条件
if (predicate == null)
{
predicate = Common.True <T>();
}
ConditionBuilder builder = new ConditionBuilder(_parameterPrefix, cmdName == "SelectJoin" ? "A" : "");
builder.Build(predicate, mb.PropertiesMap, dynParameters);
cmd.Text = Regex.Replace(cmd.Text, _placeHolderWhere, builder.Condition, RegexOptions.IgnoreCase);
//追加OrderBy
if (orderBy != null && orderBy.Properties.Count() > 0)
{
cmd.Text += " Order By ";
var list = orderBy.Properties.ToList();
foreach (var item in list)
{
PropertyEx p = null;
if (mb.PropertiesMap.TryGetValue(item, out p))
{
if (list.IndexOf(item) > 0)
{
cmd.Text += ",";
}
cmd.Text += p.DbName;
}
}
cmd.Text += " Desc ";
}
//添加脚本参数
foreach (var bParameter in builder.Parameters)
{
//参数
string parameterName = bParameter.Key;
cmd.DynamicParameters.Add(parameterName, bParameter.Value);
}
return(cmd);
}
internal Command Build <T>(Expression <Func <T, T> > updater, Expression <Func <T, bool> > predicate) where T : class
{
//UPDATE TABLE #SET# WHERE 1=1 And FieldName = @p0
Command cmd = this.Build <T>(CommandBuilder.UpdateByExpr, predicate, null, null);
MemberInitExpression updateExpr = (MemberInitExpression)updater.Body;
StringBuilder sqlBuilder = new StringBuilder(Environment.NewLine);
for (int i = 0; i < updateExpr.Bindings.Count; i++)
{
//SQL片断
MemberAssignment member = (MemberAssignment)updateExpr.Bindings[i];
var propertiesMap = MapperBuilder.GetPropertiesMap <T>();
string dbName = member.Member.Name;
if (propertiesMap.ContainsKey(member.Member.Name))
{
dbName = propertiesMap[member.Member.Name].DbName;
}
sqlBuilder.AppendFormat("{0} = {1}{2}", dbName, _parameterPrefix, member.Member.Name);
if (i < updateExpr.Bindings.Count - 1)
{
sqlBuilder.Append(",");
}
sqlBuilder.AppendLine();
//SQL参数
if (member.Expression is ConstantExpression)
{
cmd.DynamicParameters.Add(member.Member.Name, ((ConstantExpression)member.Expression).Value);
}
else
{
//计算常量
PartialEvaluator evaluator = new PartialEvaluator();
Expression evalExpr = evaluator.Eval(member.Expression);
cmd.DynamicParameters.Add(member.Member.Name, ((ConstantExpression)evalExpr).Value);
}
}
cmd.Text = Regex.Replace(cmd.Text, _placeHolderSet, sqlBuilder.ToString(), RegexOptions.IgnoreCase);
return(cmd);
}
