在Android数据库中，我得到此错误：android.database.sqlite.SQLiteException：在“ +”附近：语法错误（代码1）

Question

您好，我收到此错误：android.database.sqlite.SQLiteException：靠近“ +”语法错误（代码1），同时编译：SELECT * FROM tbl_Individual_Donor_Registration WHERE BloodGroup = B +

这是我的表元素代码：

public static final int DATABASE_VERSION = 3;
public static final String DATABASE_NAME = "BLOOD_PROJECT";
public static final String TABLE_NAME = "tbl_Individual_Donor_Registration";
public static final String TABLE_NAME_BLOOD_BANK = "tbl_Blood_Bank_Registration";
public static final String COL_1 = "Id";
public static final String COL_2 = "Name";
public static final String COL_3 = "Password";
public static final String COL_4 = "BloodGroup";
public static final String COL_5 = "BloodQuantity";
public static final String COL_6 = "MobileNo";

这里是我的实际选择查询的代码：

    String select = "SELECT * FROM " + TABLE_NAME + " WHERE " + COL_4 + " = "+ final_blood_group; 

并且final_blood_group来自微调值，该值来自用户的选择，希望您能帮助我，谢谢。

Answer 1

您需要在代码中更改一些小东西。在此处采样

正确的代码应该这样

   SELECT * FROM tbl_Individual_Donor_Registration WHERE BloodGroup = 'B+'//you need single quote in B+

所以您需要在[]中加上单引号>

final_blood_group="'B+'";
然后您的代码如下所示

SELECT * FROM tbl_Individual_Donor_Registration WHERE BloodGroup ='B +'

如果您不带单身放，则作为琴键。