Question

我正在使用内容提供程序在sqlite中存储数据，并使用游标适配器在listview中显示数据。我有3张桌子

1）Leads- [_ id，name，....]

2）LeadsAttachment- [_id，format，LeadId，....]（LeadId是FK to _id PK of Leads表）

3）LeadsProduct- [_ id，pname，LeadId，....]（LeadId是FK to _id PK of Leads表）

现在我正在使用SQLQueryBuilder执行Leads和LeadsAttachment之间的左连接

SQLiteQueryBuilder leadsWithAttachmentQueryBuilder = new SQLiteQueryBuilder();
leadsWithAttachmentQueryBuilder.setTables(
            MBenzContracts.LeadsEntry.TABLE_NAME + " LEFT JOIN " +
                    MBenzContracts.LeadAttachmentEntry.TABLE_NAME +
                    " ON " + MBenzContracts.LeadAttachmentEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadAttachmentEntry.COLUMN_Lead_ID +
                    " = " + MBenzContracts.LeadsEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadsEntry._ID);

我将如何在SQLiteQueryBuilder中一起执行2个左连接，以便我得到所有来自Leads的记录以及LeadsAttachment和LeadsProduct

Answer 1

想通了，非常简单

leadsWithProductAndAttachmentQueryBuilder.setTables(
            MBenzContracts.LeadsEntry.TABLE_NAME + " LEFT JOIN " +
                    MBenzContracts.LeadProductEntry.TABLE_NAME +
                    " ON " + MBenzContracts.LeadProductEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadProductEntry.COLUMN_Lead_ID +
                    " = " + MBenzContracts.LeadsEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadsEntry._ID + " LEFT JOIN " +
                    MBenzContracts.LeadAttachmentEntry.TABLE_NAME +
                    " ON " + MBenzContracts.LeadAttachmentEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadAttachmentEntry.COLUMN_Lead_ID +
                    " = " + MBenzContracts.LeadsEntry.TABLE_NAME +
                    "." + MBenzContracts.LeadsEntry._ID);

与SQLiteQueryBuilder的多个连接

1 个答案: