protected override SqlBuilder Where(UnaryExpression expression, SqlBuilder sqlBuilder)
{
//解析x => !x.isDeletion这样的
if (expression.NodeType == ExpressionType.Not && expression.Operand is MemberExpression && expression.Type == typeof(bool))
{
var dbParamName = sqlBuilder.AddDbParameter(0);
var memberExpression = expression.Operand as MemberExpression;
//添加到查询条件
var tableName = memberExpression.Member.DeclaringType.GetTableName(sqlBuilder._dbSqlParser);
sqlBuilder.SetTableAlias(tableName);
string tableAlias = sqlBuilder.GetTableAlias(tableName);
if (!string.IsNullOrWhiteSpace(tableAlias))
{
tableAlias += ".";
}
sqlBuilder.SqlWhereStr += " " + tableAlias + memberExpression.Member.Name;
sqlBuilder.SqlWhereStr += " = ";
sqlBuilder.SqlWhereStr += $"{dbParamName}";
}
else
{
SqlProvider.Where(expression.Operand, sqlBuilder);
}
return(sqlBuilder);
}
private static void LikeLeft(MethodCallExpression expression, SqlBuilder sqlBuilder)
{
if (expression.Object != null)
{
SqlProvider.Where(expression.Object, sqlBuilder);
}
SqlProvider.Where(expression.Arguments[0], sqlBuilder);
sqlBuilder.SqlWhereStr += " like '%' +";
SqlProvider.Where(expression.Arguments[1], sqlBuilder);
}
public SqlQueryable <T> Where(Expression <Func <T, bool> > expression)
{
if (expression == null)
{
throw new ArgumentNullException("expression", "Value cannot be null");
}
if (expression.Body != null && expression.Body.NodeType == ExpressionType.Constant)
{
throw new ArgumentException("Cannot be parse expression", "expression");
}
if (!this._sqlBuilder.IsAddWhere)
{
this._sqlBuilder.SqlWhereStr += " where";
}
else
{
this._sqlBuilder.SqlWhereStr += " and";
}
SqlProvider.Where(expression.Body, this._sqlBuilder);
return(this);
}
protected override SqlBuilder Where(ParameterExpression expression, SqlBuilder sqlBuilder)
{
SqlProvider.Where(expression, sqlBuilder);
return(sqlBuilder);
}
private static void InnerIn(MethodCallExpression expression, SqlBuilder sqlBuilder)
{
SqlProvider.Where(expression.Arguments[0], sqlBuilder);
sqlBuilder.SqlWhereStr += " in";
SqlProvider.In(expression.Arguments[1], sqlBuilder);
}
protected override SqlBuilder Where(BinaryExpression expression, SqlBuilder sqlBuilder)
{
bool hasHandle = false;
if (CheckMemberIsNotColumn(expression, sqlBuilder))
{
return(sqlBuilder);
}
//添加Where表达式左侧sql
if (IsNeedsParentheses(expression, expression.Left))
{
sqlBuilder.SqlWhereStr += "(";
}
if (expression.Left is MemberExpression && expression.Left.Type == typeof(bool) && expression.Left.NodeType == ExpressionType.MemberAccess && (expression.NodeType == ExpressionType.AndAlso || expression.Right is ConstantExpression))
{
//解析（m=>m.IsAdmin)
var memberExpression = expression.Left as MemberExpression;
var tableName = memberExpression.Member.DeclaringType.GetTableName(sqlBuilder._dbSqlParser);
sqlBuilder.SetTableAlias(tableName);
string tableAlias = sqlBuilder.GetTableAlias(tableName);
if (!string.IsNullOrWhiteSpace(tableAlias))
{
tableAlias += ".";
}
//添加参数
var dbParamName = string.Empty;
if (expression.Right is ConstantExpression)
{
hasHandle = true;
var value = Convert.ToBoolean(((ConstantExpression)expression.Right).Value) ? 1 : 0;
dbParamName = sqlBuilder.AddDbParameter(value);
}
else
{
dbParamName = sqlBuilder.AddDbParameter(1);
}
//添加关联条件
sqlBuilder.SqlWhereStr += " " + tableAlias + memberExpression.Member.Name;
sqlBuilder.SqlWhereStr += " = ";
sqlBuilder.SqlWhereStr += $"{dbParamName}";
}
else
{
SqlProvider.Where(expression.Left, sqlBuilder);
}
if (IsNeedsParentheses(expression, expression.Left))
{
sqlBuilder.SqlWhereStr += ")";
}
if (!hasHandle)
{
//添加Where操作符
var whereOperator = " =";
if ((expression.Right is ConstantExpression) && ((ConstantExpression)expression.Right).Value == null)
{
whereOperator = OperatorParser(expression.NodeType, true);
}
else
{
whereOperator = OperatorParser(expression.NodeType);
}
sqlBuilder.SqlWhereStr += $"{whereOperator}";
//添加Where表达式右侧sql
if (IsNeedsParentheses(expression, expression.Right))
{
sqlBuilder.SqlWhereStr += "(";
}
if (expression.Right is MemberExpression && expression.Right.Type == typeof(bool) && expression.Right.NodeType == ExpressionType.MemberAccess && expression.NodeType == ExpressionType.AndAlso)
{
//解析（m=>m.IsAdmin)
var memberExpression = expression.Right as MemberExpression;
var tableName = memberExpression.Member.DeclaringType.GetTableName(sqlBuilder._dbSqlParser);
sqlBuilder.SetTableAlias(tableName);
string tableAlias = sqlBuilder.GetTableAlias(tableName);
if (!string.IsNullOrWhiteSpace(tableAlias))
{
tableAlias += ".";
}
//添加参数
var dbParamName = sqlBuilder.AddDbParameter(1);
//添加关联条件
sqlBuilder.SqlWhereStr += " " + tableAlias + memberExpression.Member.Name;
sqlBuilder.SqlWhereStr += " = ";
sqlBuilder.SqlWhereStr += $"{dbParamName}";
}
else
{
SqlProvider.Where(expression.Right, sqlBuilder);
}
if (IsNeedsParentheses(expression, expression.Right))
{
sqlBuilder.SqlWhereStr += ")";
}
}
return(sqlBuilder);
}