protected override SqlGenerate Where(MemberExpression expression, SqlGenerate sqlGenerate)
{
if (expression.Expression != null)
{
if (expression.Member.DeclaringType.IsNullableType())
{
if (expression.Member.Name == "Value") //Can't use C# 6 yet: nameof(Nullable<bool>.Value)
{
SqlExpressionProvider.Where(expression.Expression, sqlGenerate);
return(sqlGenerate);
}
if (expression.Member.Name == "HasValue")
{
var doesNotEqualNull = Expression.MakeBinary(ExpressionType.NotEqual, expression.Expression, Expression.Constant(null));
SqlExpressionProvider.Where(doesNotEqualNull, sqlGenerate);
return(sqlGenerate);
}
throw new ArgumentException($"Expression '{expression}' accesses unsupported property '{expression.Member}' of Nullable<T>");
}
if (expression.IsParameterOrConvertAccess())
{
sqlGenerate += $" {expression.Member.Name.ParamSql(sqlGenerate)}";
return(sqlGenerate);
}
}
var val = SqlExpressionCompiler.Evaluate(expression);
sqlGenerate.AddDbParameter(val);
return(sqlGenerate);
}
/// <summary>
/// OrderBy
/// </summary>
/// <param name="orderBy"></param>
/// <returns></returns>
public SqlExpressionCore <T> OrderBy(string orderBy)
{
if (string.IsNullOrEmpty(orderBy))
{
var keyAttr = typeof(T).GetProperty <KeyAttribute>();
if (keyAttr == null)
{
throw new Exception("实体未设置Key属性");
}
orderBy = $"order by {keyAttr.Name} desc";
}
if (!orderBy.StartsWith("order by"))
{
orderBy = $"order by {orderBy}";
}
switch (sqlGenerate.DatabaseType)
{
case DatabaseType.SqlServer:
sqlGenerate.Sql.Replace("select", $"select row_number() over({orderBy}) as RowNumber,");
break;
case DatabaseType.MySql:
sqlGenerate += $"{Environment.NewLine}{orderBy}";
break;
case DatabaseType.SQLite:
sqlGenerate += $"{Environment.NewLine}{orderBy}";
break;
}
return(this);
}
protected override SqlGenerate In(MemberExpression expression, SqlGenerate sqlGenerate)
{
var result = SqlExpressionCompiler.Evaluate(expression);
var inArgs = (result as IEnumerable).Flatten();
sqlGenerate += "(";
if (inArgs?.Count > 0)
{
foreach (var item in inArgs)
{
sqlGenerate.AddDbParameter(item);
sqlGenerate += ",";
}
if (sqlGenerate.Sql.ToString().EndsWith(","))
{
sqlGenerate.Sql.Remove(sqlGenerate.Sql.Length - 1, 1);
}
}
else
{
sqlGenerate += "NULL";
}
sqlGenerate += ")";
return(sqlGenerate);
}
protected override SqlGenerate Where(LambdaExpression expression, SqlGenerate sqlGenerate)
{
if (expression.Body.NodeType == ExpressionType.MemberAccess)
{
var memberExpression = expression.Body as MemberExpression;
if (memberExpression.Expression == null)
{
return(sqlGenerate);
}
//添加属性
SqlExpressionProvider.Where(memberExpression, sqlGenerate);
if (memberExpression.Expression.Type.IsNullableType())
{
return(sqlGenerate);
}
sqlGenerate += " = 1";
return(sqlGenerate);
}
SqlExpressionProvider.Where(expression.Body, sqlGenerate);
return(sqlGenerate);
}
protected override SqlGenerate Where(BinaryExpression expression, SqlGenerate sqlGenerate)
{
int leftBracketIndex = -1, rightBracketIndex = -1, signIndex = -1, sqlLength = -1;
leftBracketIndex = sqlGenerate.Length;
#region 内部内容
if (expression.NodeType == ExpressionType.AndAlso || expression.NodeType == ExpressionType.OrElse)
{
if (expression.Left.IsBooleanComparison())
{
SqlExpressionProvider.Where(expression.Left, sqlGenerate);
sqlGenerate += $" = 1";
}
else
{
SqlExpressionProvider.Where(expression.Left, sqlGenerate);
}
signIndex = sqlGenerate.Length;
if (expression.Right.IsBooleanComparison())
{
SqlExpressionProvider.Where(expression.Right, sqlGenerate);
sqlGenerate += $" = 1";
}
else
{
SqlExpressionProvider.Where(expression.Right, sqlGenerate);
}
sqlLength = sqlGenerate.Length;
}
else
{
SqlExpressionProvider.Where(expression.Left, sqlGenerate);
signIndex = sqlGenerate.Length;
SqlExpressionProvider.Where(expression.Right, sqlGenerate);
sqlLength = sqlGenerate.Length;
}
if (sqlLength - signIndex == 5 && sqlGenerate.ToString().EndsWith("null"))
{
OperatorParser(expression.NodeType, signIndex, sqlGenerate, true);
}
else
{
OperatorParser(expression.NodeType, signIndex, sqlGenerate);
}
#endregion
if (expression.NodeType == ExpressionType.OrElse || expression.NodeType == ExpressionType.AndAlso)
{
sqlGenerate.Sql.Insert(leftBracketIndex, " ( ");
rightBracketIndex = sqlGenerate.Length;
sqlGenerate.Sql.Insert(rightBracketIndex, " ) ");
}
return(sqlGenerate);
}
/// <summary>
/// 修改
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public SqlExpressionCore <T> Update(Expression <Func <object> > expression = null)
{
sqlGenerate.Clear();
sqlGenerate += $"update {sqlGenerate.TableName} set ";
SqlExpressionProvider.Update(expression, sqlGenerate);
return(this);
}
protected override SqlGenerate Select(NewExpression expression, SqlGenerate sqlGenerate)
{
foreach (Expression item in expression.Arguments)
{
SqlExpressionProvider.Select(item, sqlGenerate);
}
return(sqlGenerate);
}
private static void StartsWith(MethodCallExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Where(expression.Object, sqlGenerate);
SqlExpressionProvider.Where(expression.Arguments[0], sqlGenerate);
sqlGenerate += " like ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[0]);
sqlGenerate.AddDbParameter($"{val}%");
}
/// <summary>
/// Where条件
/// </summary>
/// <param name="expression"></param>
/// <returns></returns>
public SqlExpressionCore <T> Where(Expression <Func <T, bool> > expression)
{
if (expression == null)
{
return(this);
}
sqlGenerate += $"{Environment.NewLine}where";
SqlExpressionProvider.Where(expression, sqlGenerate);
return(this);
}
protected override SqlGenerate Where(UnaryExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Where(expression.Operand, sqlGenerate);
switch (expression.NodeType)
{
case ExpressionType.Not:
sqlGenerate += " = 0";
break;
}
return(sqlGenerate);
}
protected override SqlGenerate OrderBy(NewExpression expression, SqlGenerate sqlGenerate)
{
foreach (Expression item in expression.Arguments)
{
SqlExpressionProvider.OrderBy(item, sqlGenerate);
sqlGenerate += ",";
}
if (sqlGenerate[sqlGenerate.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Length - 1, 1);
}
return(sqlGenerate);
}
protected override SqlGenerate In(NewArrayExpression expression, SqlGenerate sqlGenerate)
{
sqlGenerate += "(";
foreach (Expression expressionItem in expression.Expressions)
{
SqlExpressionProvider.In(expressionItem, sqlGenerate);
}
if (sqlGenerate.Sql[sqlGenerate.Sql.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Sql.Length - 1, 1);
}
sqlGenerate += ")";
return(sqlGenerate);
}
protected override SqlGenerate Update(NewExpression expression, SqlGenerate sqlGenerate)
{
for (int i = 0; i < expression.Members.Count; i++)
{
var m = expression.Members[i];
sqlGenerate += $"{m.Name.ParamSql(sqlGenerate)} = ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[i]);
sqlGenerate.AddDbParameter(val);
sqlGenerate += ",";
}
if (sqlGenerate[sqlGenerate.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Length - 1, 1);
}
return(sqlGenerate);
}
protected override SqlGenerate Where(MethodCallExpression expression, SqlGenerate sqlGenerate)
{
var key = expression.Method;
if (key.IsGenericMethod)
{
key = key.GetGenericMethodDefinition();
}
Action <MethodCallExpression, SqlGenerate> action;
if (_Methods.TryGetValue(key.Name, out action))
{
action(expression, sqlGenerate);
return(sqlGenerate);
}
throw new NotImplementedException("无法解析方法" + expression.Method);
}
private static void Contains(MethodCallExpression expression, SqlGenerate sqlGenerate)
{
if (IsStaticArrayMethod(expression))
{
DoStaticArrayMethodCall(expression, sqlGenerate);
return;
}
if (IsEnumerableMethod(expression))
{
DoEnumerableMethodCall(expression, sqlGenerate);
return;
}
SqlExpressionProvider.Where(expression.Object, sqlGenerate);
sqlGenerate += " like ";
var val = SqlExpressionCompiler.Evaluate(expression.Arguments[0]);
sqlGenerate.AddDbParameter($"%{val}%");
}
protected override SqlGenerate Update(MemberExpression expression, SqlGenerate sqlGenerate)
{
var obj = SqlExpressionCompiler.Evaluate(expression);
if (obj == null)
{
throw new ArgumentException($"Expression '{expression}' accesses unsupported property '{expression.Member}' of Nullable<T>");
}
if (obj.GetType().IsValueType)
{
throw new ArgumentException($"Expression '{expression}' accesses unsupported valuetype");
}
if (obj is IDictionary)
{
IDictionary dictionary = (IDictionary)obj;
foreach (string key in dictionary.Keys)
{
sqlGenerate += $"{key.ParamSql(sqlGenerate)} = ";
sqlGenerate.AddDbParameter(dictionary[key]);
sqlGenerate += ",";
}
}
else
{
var pis = obj.GetType().GetProperties();
foreach (var p in pis)
{
sqlGenerate += $"{p.Name.ParamSql(sqlGenerate)} = ";
sqlGenerate.AddDbParameter(p.GetValue(obj));
sqlGenerate += ",";
}
}
if (sqlGenerate[sqlGenerate.Length - 1] == ',')
{
sqlGenerate.Sql.Remove(sqlGenerate.Length - 1, 1);
}
return(sqlGenerate);
}
/// <summary>
/// Limit
/// </summary>
/// <param name="page"></param>
/// <param name="rows"></param>
/// <returns></returns>
public SqlExpressionCore <T> Limit(int page, int rows)
{
var skip = (page - 1) * rows;
switch (sqlGenerate.DatabaseType)
{
case DatabaseType.SqlServer:
sqlGenerate.Sql = new StringBuilder($"SELECT it.* FROM ({sqlGenerate.Sql}) it where it.RowNumber > {skip} AND it.RowNumber <= {rows}");
break;
case DatabaseType.MySql:
sqlGenerate += $" limit {skip}, {rows}";
break;
case DatabaseType.SQLite:
sqlGenerate += $" limit {rows} offset {skip}";
break;
default:
break;
}
return(this);
}
protected override SqlGenerate Select(UnaryExpression expression, SqlGenerate sqlGenerate)
{
SqlExpressionProvider.Select(expression.Operand, sqlGenerate);
return(sqlGenerate);
}
protected override SqlGenerate Sum(MemberExpression expression, SqlGenerate sqlGenerate)
{
sqlGenerate.Sql.AppendFormat("select sum({0}) from {1}", expression.Member.Name.ParamSql(sqlGenerate), sqlGenerate.TableName);
return(sqlGenerate);
}
public SqlGenerate Count(Expression expression, SqlGenerate sqlGenerate)
{
return(Count((T)expression, sqlGenerate));
}
public SqlGenerate Avg(Expression expression, SqlGenerate sqlGenerate)
{
return(Avg((T)expression, sqlGenerate));
}
public SqlGenerate Min(Expression expression, SqlGenerate sqlGenerate)
{
return(Min((T)expression, sqlGenerate));
}
public SqlGenerate OrderBy(Expression expression, SqlGenerate sqlGenerate)
{
return(OrderBy((T)expression, sqlGenerate));
}
protected virtual SqlGenerate Update(T expression, SqlGenerate sqlGenerate)
{
throw new NotImplementedException("未实现" + typeof(T).Name + "2Sql.Update方法");
}
public SqlGenerate Where(Expression expression, SqlGenerate sqlGenerate)
{
return(Where((T)expression, sqlGenerate));
}
public SqlGenerate Select(Expression expression, SqlGenerate sqlGenerate)
{
return(Select((T)expression, sqlGenerate));
}
public SqlGenerate Update(Expression expression, SqlGenerate sqlGenerate)
{
return(Update((T)expression, sqlGenerate));
}
public SqlGenerate Sum(Expression expression, SqlGenerate sqlGenerate)
{
return(Sum((T)expression, sqlGenerate));
}
protected override SqlGenerate OrderBy(MemberExpression expression, SqlGenerate sqlGenerate)
{
sqlGenerate += expression.Member.Name.ParamSql(sqlGenerate);
return(sqlGenerate);
}
/// <summary>
/// 删除
/// </summary>
/// <returns></returns>
public SqlExpressionCore <T> Delete()
{
sqlGenerate.Clear();
sqlGenerate += $"delete from {sqlGenerate.TableName}";
return(this);
}
