/// <summary>
/// 根据指定操作及表达式生成语句。
/// </summary>
/// <param name="operate">操作对象。</param>
/// <param name="content">表达式。</param>
/// <returns>生成的语句。</returns>
public string Generate(DbOperateBase operate, DbExpression content)
{
var context = new GenerateContext(operate, this);
context.Data.Inititalze(content);
SqlFragment fragment = null;
switch (operate.Type)
{
case EOperateType.InsertObjects: fragment = GenerateForInsert(context); break;
case EOperateType.UpdateObjects: fragment = GenerateForUpdate(context); break;
case EOperateType.DeleteObjects: fragment = GenerateForDelete(context); break;
case EOperateType.QueryObject:
case EOperateType.QueryCollection: fragment = GenerateForQuery(context, content); break;
case EOperateType.InsertPropertys: fragment = GenerateForInsert(context, content); break;
case EOperateType.UpdatePropertys: fragment = GenerateForUpdate(context, content); break;
case EOperateType.InsertStatement: fragment = GenerateForInsertStatement(context, content); break;
case EOperateType.UpdateStatement: fragment = GenerateForUpdateStatement(context, content); break;
case EOperateType.DeleteStatement: fragment = GenerateForDeleteStatement(context, content); break;
case EOperateType.AddRelation:
case EOperateType.RemoveRelation: fragment = GenerateForRelation(context); break;
default:
if (operate is DbMaintenanceOperateBase maintenance)
{
fragment = GenerateForMaintenance(context);
}
break;
}
return(fragment.ToString());
}
