/// <summary>
/// 获取单个连接条件
/// </summary>
private void On(OnItem item, StringBuilder result, IDialect dialect)
{
var left = item.Left.ToSql(dialect);
var right = item.Right.ToSql(dialect);
result.Append(SqlConditionFactory.Create(left, right, item.Operator).GetCondition());
}
/// <summary>
/// 创建查询条件并添加参数
/// </summary>
/// <param name="column">列名</param>
/// <param name="value">值</param>
/// <param name="operator">运算符</param>
/// <returns></returns>
public ICondition CreateCondition(string column, object value, Operator @operator)
{
if (string.IsNullOrWhiteSpace(column))
{
throw new ArgumentNullException(nameof(column));
}
if (_parameterManager == null)
{
return(null);
}
column = GetColumn(column);
if (IsInCondition(@operator, value))
{
return(CreateInCondition(column, value as IEnumerable));
}
if (IsNotInCondition(@operator, value))
{
return(CreateInCondition(column, value as IEnumerable, true));
}
var paramName = GenerateParamName(value, @operator);
_parameterManager.Add(paramName, value, @operator);
return(SqlConditionFactory.Create(column, paramName, @operator));
}
/// <summary>
/// 设置连接条件
/// </summary>
/// <typeparam name="TLeft">左表实体类型</typeparam>
/// <typeparam name="TRight">右表实体类型</typeparam>
/// <param name="left">左表列名</param>
/// <param name="right">右表列名</param>
/// <param name="operator">条件运算符</param>
public void On <TLeft, TRight>(Expression <Func <TLeft, object> > left, Expression <Func <TRight, object> > right, Operator @operator = Operator.Equal) where TLeft : class where TRight : class
{
var leftColumn = new SqlItem(GetColumn(left)).ToSql(_dialect);
var rightColumn = new SqlItem(GetColumn(right)).ToSql(_dialect);
var condition = SqlConditionFactory.Create(leftColumn, rightColumn, @operator);
AppendOn(condition.GetCondition());
}
/// <summary>
/// 设置子查询条件
/// </summary>
/// <param name="column">列名</param>
/// <param name="builder">子查询Sql生成器</param>
/// <param name="operator">运算符</param>
public void Where(string column, ISqlBuilder builder, Operator @operator = Operator.Equal)
{
if (builder == null)
{
return;
}
column = _helper.GetColumn(column);
var sql = $"({builder.ToSql()})";
And(SqlConditionFactory.Create(column, sql, @operator));
}
/// <summary>
/// 获取查询条件并添加参数
/// </summary>
/// <param name="column">列名</param>
/// <param name="value">值</param>
/// <param name="operator">运算符</param>
/// <returns></returns>
private ICondition GetCondition(string column, object value, Operator @operator)
{
if (string.IsNullOrWhiteSpace(column))
{
throw new ArgumentNullException(nameof(column));
}
column = GetColumn(column);
var paramName = GetParamName();
_parameterManager.Add(paramName, value, @operator);
return(SqlConditionFactory.Create(column, paramName, @operator));
}
/// <summary>
/// 创建查询条件并添加参数
/// </summary>
/// <param name="column">列名</param>
/// <param name="value">值</param>
/// <param name="operator">运算符</param>
public ICondition CreateCondition(string column, object value, Operator @operator)
{
if (string.IsNullOrWhiteSpace(column))
{
throw new ArgumentNullException(nameof(column));
}
column = GetColumn(column);
if (@operator == Operator.Contains && value != null && Reflection.IsCollection(value.GetType()))
{
return(CreateInCondition(column, value as IEnumerable));
}
var paramName = GenerateParamName(value, @operator);
_parameterManager.Add(paramName, value, @operator);
return(SqlConditionFactory.Create(column, paramName, @operator));
}
public void Test_1()
{
var item = new JoinItem("join", "b");
item.On(SqlConditionFactory.Create("a.A", "b.B", Operator.Equal));
//复制一份
var copy = item.Clone(null);
Assert.Equal("join b On a.A=b.B", item.ToSql());
Assert.Equal("join b On a.A=b.B", copy.ToSql());
//修改副本
copy.On(SqlConditionFactory.Create("a.C", "b.D", Operator.Equal));
Assert.Equal("join b On a.A=b.B", item.ToSql());
Assert.Equal("join b On a.A=b.B And a.C=b.D", copy.ToSql());
}
/// <summary>
/// 设置连接条件
/// </summary>
public void On(List <List <OnItem> > items, IDialect dialect)
{
if (items == null)
{
return;
}
ICondition orCondition = null;
foreach (var onItems in items)
{
ICondition condition = null;
foreach (var item in onItems)
{
condition = new AndCondition(condition, SqlConditionFactory.Create(item.Left.ToSql(dialect), item.Right.ToSql(dialect), item.Operator));
}
orCondition = new OrCondition(orCondition, condition);
}
On(orCondition);
}
