public Expression2SqlCore <T> Sum(Expression <Func <T, object> > expression)
{
this._sqlPack.Clear();
this._sqlPack.IsSingleTable = true;
Expression2SqlProvider.Sum(expression.Body, this._sqlPack);
return(this);
}
public Expression2SqlCore <T> Update(Expression <Func <object> > expression = null)
{
this._sqlPack.Clear();
this._sqlPack.IsSingleTable = true;
this._sqlPack += "update " + typeof(T).Name + " set ";
Expression2SqlProvider.Update(expression.Body, this._sqlPack);
return(this);
}
protected override SqlPack OrderBy(NewExpression expression, SqlPack sqlPack)
{
foreach (Expression item in expression.Arguments)
{
Expression2SqlProvider.OrderBy(item, sqlPack);
}
return(sqlPack);
}
private Expression2SqlCore <T> JoinParser2 <T2, T3>(Expression <Func <T2, T3, bool> > expression, string leftOrRightJoin = "")
{
string joinTableName = typeof(T3).Name;
this._sqlPack.SetTableAlias(joinTableName);
this._sqlPack.Sql.AppendFormat("\n{0}join {1} on", leftOrRightJoin, joinTableName + " " + this._sqlPack.GetTableAlias(joinTableName));
Expression2SqlProvider.Join(expression.Body, this._sqlPack);
return(this);
}
private static void LikeLeft(MethodCallExpression expression, SqlPack sqlPack)
{
if (expression.Object != null)
{
Expression2SqlProvider.Where(expression.Object, sqlPack);
}
Expression2SqlProvider.Where(expression.Arguments[0], sqlPack);
sqlPack += " like '%' +";
Expression2SqlProvider.Where(expression.Arguments[1], sqlPack);
}
public Expression2SqlCore <T> Count(Expression <Func <T, object> > expression = null)
{
this._sqlPack.Clear();
this._sqlPack.IsSingleTable = true;
if (expression == null)
{
this._sqlPack.Sql.AppendFormat("select count(*) from {0}", typeof(T).Name);
}
else
{
Expression2SqlProvider.Count(expression.Body, this._sqlPack);
}
return(this);
}
public Expression2SqlCore <T> Select <T2>(Expression <Func <T, T2, object> > expression = null)
{
string sql = SelectParser(typeof(T), typeof(T2));
if (expression == null)
{
this._sqlPack.Sql.AppendFormat(sql, "*");
}
else
{
Expression2SqlProvider.Select(expression.Body, this._sqlPack);
this._sqlPack.Sql.AppendFormat(sql, this._sqlPack.SelectFieldsStr);
}
return(this);
}
public Expression2SqlCore <T> Select <T2, T3, T4, T5, T6, T7, T8, T9, T10>(Expression <Func <T, T2, T3, T4, T5, T6, T7, T8, T9, T10, object> > expression = null)
{
string sql = SelectParser(typeof(T), typeof(T2), typeof(T3), typeof(T4), typeof(T5), typeof(T6), typeof(T7), typeof(T8), typeof(T9), typeof(T10));
if (expression == null)
{
this._sqlPack.Sql.AppendFormat(sql, "*");
}
else
{
Expression2SqlProvider.Select(expression.Body, this._sqlPack);
this._sqlPack.Sql.AppendFormat(sql, this._sqlPack.SelectFieldsStr);
}
return(this);
}
protected override SqlPack In(NewArrayExpression expression, SqlPack sqlPack)
{
sqlPack += "(";
//拼接具体值
foreach (Expression expressionItem in expression.Expressions)
{
Expression2SqlProvider.In(expressionItem, sqlPack);
}
if (sqlPack.Sql[sqlPack.Sql.Length - 1] == ',')
{
sqlPack.Sql.Remove(sqlPack.Sql.Length - 1, 1);
}
sqlPack += ")";
return(sqlPack);
}
protected override SqlPack Where(BinaryExpression expression, SqlPack sqlPack)
{
Expression2SqlProvider.Where(expression.Left, sqlPack);
int signIndex = sqlPack.Length;
Expression2SqlProvider.Where(expression.Right, sqlPack);
int sqlLength = sqlPack.Length;
if (sqlLength - signIndex == 5 && sqlPack.ToString().EndsWith("null"))
{
OperatorParser(expression.NodeType, signIndex, sqlPack, true);
}
else
{
OperatorParser(expression.NodeType, signIndex, sqlPack);
}
return(sqlPack);
}
/// <summary>
/// Select 解析
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public Expression2SqlCore <T> Select(Expression <Func <T, object> > expression = null)
{
///获得sql
string sql = SelectParser(typeof(T));
///判断查询所有字段
if (expression == null)
{
this._sqlPack.Sql.AppendFormat(sql, "*");
}
else
{
///解析要查询的字段
Expression2SqlProvider.Select(expression.Body, this._sqlPack);
this._sqlPack.Sql.AppendFormat(sql, this._sqlPack.SelectFieldsStr);
}
return(this);
}
protected override SqlPack Select(UnaryExpression expression, SqlPack sqlPack)
{
////获取一元运算的操作数。
Expression2SqlProvider.Select(expression.Operand, sqlPack);
return(sqlPack);
}
protected override SqlPack Sum(UnaryExpression expression, SqlPack sqlPack)
{
Expression2SqlProvider.Sum(expression.Operand, sqlPack);
return(sqlPack);
}
private static void In(MethodCallExpression expression, SqlPack sqlPack)
{
Expression2SqlProvider.Where(expression.Arguments[0], sqlPack);
sqlPack += " in";
Expression2SqlProvider.In(expression.Arguments[1], sqlPack);
}
public Expression2SqlCore <T> OrderBy(Expression <Func <T, object> > expression)
{
this._sqlPack += "\norder by ";
Expression2SqlProvider.OrderBy(expression.Body, this._sqlPack);
return(this);
}
public Expression2SqlCore <T> GroupBy(Expression <Func <T, object> > expression)
{
this._sqlPack += "\ngroup by ";
Expression2SqlProvider.GroupBy(expression.Body, this._sqlPack);
return(this);
}
public Expression2SqlCore <T> Where(Expression <Func <T, bool> > expression)
{
this._sqlPack += "\nwhere";
Expression2SqlProvider.Where(expression.Body, this._sqlPack);
return(this);
}