/// <summary>
/// GroupBy
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack GroupBy(MemberExpression expression, SqlPack sqlPack)
{
string tableName = string.Empty;
if (expression.Expression.NodeType == ExpressionType.Parameter)
{
var type = expression.Expression.Type != expression.Member.DeclaringType ?
expression.Expression.Type :
expression.Member.DeclaringType;
tableName = sqlPack.GetTableName(type);
}
if (expression.Expression.NodeType == ExpressionType.Constant)
{
tableName = sqlPack.GetTableName(sqlPack.DefaultType);
}
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
if (expression.Expression.NodeType == ExpressionType.Parameter)
{
sqlPack += tableAlias + sqlPack.GetColumnInfo(expression.Member.DeclaringType, expression.Member).columnName;
}
if (expression.Expression.NodeType == ExpressionType.Constant)
{
var obj = expression.ToObject();
if (obj != null)
{
var type = obj.GetType().Name;
if (type == "String[]" && obj is string[] array)
{
foreach (var item in array)
{
SqlBuilderProvider.GroupBy(Expression.Constant(item, item.GetType()), sqlPack);
}
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
if (type == "List`1" && obj is List <string> list)
{
foreach (var item in list)
{
SqlBuilderProvider.GroupBy(Expression.Constant(item, item.GetType()), sqlPack);
}
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
if (type == "String" && obj is string str)
{
SqlBuilderProvider.GroupBy(Expression.Constant(str, str.GetType()), sqlPack);
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
}
}
return(sqlPack);
}
/// <summary>
/// Select
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Select(ParameterExpression expression, SqlPack sqlPack)
{
var tableName = sqlPack.GetTableName(expression.Type);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
sqlPack.SelectFields.Add($"{tableAlias}.*");
return(sqlPack);
}
/// <summary>
/// GroupBy
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack GroupBy(ConstantExpression expression, SqlPack sqlPack)
{
var tableName = sqlPack.GetTableName(sqlPack.DefaultType);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
sqlPack += tableAlias + sqlPack.GetColumnName(expression.Value.ToString()) + ",";
return(sqlPack);
}
/// <summary>
/// OrderBy
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <param name="orders">排序方式</param>
/// <returns>SqlPack</returns>
public override SqlPack OrderBy(ConstantExpression expression, SqlPack sqlPack, params OrderType[] orders)
{
var tableName = sqlPack.GetTableName(sqlPack.DefaultType);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!string.IsNullOrEmpty(tableAlias))
{
tableAlias += ".";
}
sqlPack += tableAlias + expression.Value.ToString();
return(sqlPack);
}
/// <summary>
/// Join
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Join(MemberExpression expression, SqlPack sqlPack)
{
var type = expression.Expression.Type != expression.Member.DeclaringType ?
expression.Expression.Type :
expression.Member.DeclaringType;
var tableName = sqlPack.GetTableName(type);
sqlPack.SetTableAlias(tableName);
string tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
sqlPack += tableAlias + sqlPack.GetColumnInfo(expression.Member.DeclaringType, expression.Member).columnName;
return(sqlPack);
}
/// <summary>
/// Where
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <returns>SqlPack</returns>
public override SqlPack Where(MemberExpression expression, SqlPack sqlPack)
{
//此处判断expression的Member是否是可空值类型
if (expression.Expression?.NodeType == ExpressionType.MemberAccess &&
expression.Member.DeclaringType.IsNullable())
{
expression = expression.Expression as MemberExpression;
}
if (expression != null)
{
if (expression.Expression?.NodeType == ExpressionType.Parameter)
{
var type = expression.Expression.Type != expression.Member.DeclaringType ?
expression.Expression.Type :
expression.Member.DeclaringType;
var tableName = sqlPack.GetTableName(type);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
sqlPack += tableAlias + sqlPack.GetColumnInfo(expression.Member.DeclaringType, expression.Member).columnName;
//字段是bool类型
if (expression.NodeType == ExpressionType.MemberAccess &&
expression.Type.GetCoreType() == typeof(bool))
{
sqlPack += " = 1";
}
}
else
{
sqlPack.AddDbParameter(expression.ToObject());
}
}
return(sqlPack);
}
/// <summary>
/// OrderBy
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <param name="orders">排序方式</param>
/// <returns>SqlPack</returns>
public override SqlPack OrderBy(ConstantExpression expression, SqlPack sqlPack, params OrderType[] orders)
{
var tableName = sqlPack.GetTableName(sqlPack.DefaultType);
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
var field = expression.Value.ToString();
if (!field.ToUpper().Contains(" ASC") && !field.ToUpper().Contains(" DESC"))
{
field = sqlPack.GetColumnName(field);
}
sqlPack += tableAlias + field;
if (orders?.Length > 0)
{
sqlPack += $" { (orders[0] == OrderType.Descending ? "DESC" : "ASC")}";
}
return(sqlPack);
}
/// <summary>
/// OrderBy
/// </summary>
/// <param name="expression">表达式树</param>
/// <param name="sqlPack">sql打包对象</param>
/// <param name="orders">排序方式</param>
/// <returns>SqlPack</returns>
public override SqlPack OrderBy(MemberExpression expression, SqlPack sqlPack, params OrderType[] orders)
{
string tableName = string.Empty;
if (expression.Expression.NodeType == ExpressionType.Parameter)
{
var type = expression.Expression.Type != expression.Member.DeclaringType ?
expression.Expression.Type :
expression.Member.DeclaringType;
tableName = sqlPack.GetTableName(type);
}
if (expression.Expression.NodeType == ExpressionType.Constant)
{
tableName = sqlPack.GetTableName(sqlPack.DefaultType);
}
sqlPack.SetTableAlias(tableName);
var tableAlias = sqlPack.GetTableAlias(tableName);
if (!tableAlias.IsNullOrEmpty())
{
tableAlias += ".";
}
if (expression.Expression.NodeType == ExpressionType.Parameter)
{
sqlPack += tableAlias + sqlPack.GetColumnInfo(expression.Member.DeclaringType, expression.Member).columnName;
if (orders?.Length > 0)
{
sqlPack += $" { (orders[0] == OrderType.Descending ? "DESC" : "ASC")}";
}
}
if (expression.Expression.NodeType == ExpressionType.Constant)
{
var obj = expression.ToObject();
if (obj != null)
{
var type = obj.GetType().Name;
if (type == "String[]" && obj is string[] array)
{
for (var i = 0; i < array.Length; i++)
{
SqlBuilderProvider.OrderBy(Expression.Constant(array[i], array[i].GetType()), sqlPack);
if (i <= orders.Length - 1)
{
sqlPack += $" { (orders[i] == OrderType.Descending ? "DESC" : "ASC")},";
}
else if (!array[i].ToUpper().Contains("ASC") && !array[i].ToUpper().Contains("DESC"))
{
sqlPack += " ASC,";
}
else
{
sqlPack += ",";
}
}
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
if (type == "List`1" && obj is List <string> list)
{
for (var i = 0; i < list.Count; i++)
{
SqlBuilderProvider.OrderBy(Expression.Constant(list[i], list[i].GetType()), sqlPack);
if (i <= orders.Length - 1)
{
sqlPack += $" { (orders[i] == OrderType.Descending ? "DESC" : "ASC")},";
}
else if (!list[i].ToUpper().Contains("ASC") && !list[i].ToUpper().Contains("DESC"))
{
sqlPack += " ASC,";
}
else
{
sqlPack += ",";
}
}
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
if (type == "String" && obj is string str)
{
SqlBuilderProvider.OrderBy(Expression.Constant(str, str.GetType()), sqlPack);
str = str.ToUpper();
if (!str.Contains("ASC") && !str.Contains("DESC"))
{
if (orders.Length >= 1)
{
sqlPack += $" { (orders[0] == OrderType.Descending ? "DESC" : "ASC")},";
}
else
{
sqlPack += " ASC,";
}
sqlPack.Sql.Remove(sqlPack.Length - 1, 1);
}
}
}
}
return(sqlPack);
}