Question

我正在尝试将CSV文件导入我的SQLite数据库，但出现错误。

file.csv

EMP0003 |样本| S @ mple | SATO | TEST |目的地| 00008888 | ST0001 | EMP0003 |东部位置| 0000001XABC ---->这是我的csv文件，但只能转到 E'|'M'|'P'|'0'|'0'|'0'|'3'|'|'|'s'|'a'|'m'并非所有文本

String columns = "employee_num, username, password, firstname, lastname, address, contact, van, salesman_code, station_code, machine_id";
        String str1 = "INSERT INTO " + tableName + " (" + columns + ") values(" ;
        String str2 = ");";
            mydb.beginTransaction();

        while ((line = buffer.readLine()) !=null ) {
            StringBuilder sb = new StringBuilder(str1);
            String[] str = line.split("'|' ");
            sb.append("'" + str[0] + "'|'");
            sb.append(str[1]+ "'|'");
            sb.append(str[2]+ "'|'");
            sb.append(str[3]+ "'|'");
            sb.append(str[4]+ "'|'");
            sb.append(str[5]+ "'|'");
            sb.append(str[6]+ "'|'");
            sb.append(str[7]+ "'|'");
            sb.append(str[8]+ "'|'");
            sb.append(str[9]+ "'|'");
            sb.append(str[10]+ "'|'");
            sb.append(str[11].replace("'", "") + "'");
            mydb.execSQL(sb.toString());
    }

错误

Error : E/SQLiteLog: (1) near "'m'": syntax error
/ W/System.err: android.database.sqlite.SQLiteException: near "'m'": syntax error (code 1): , while compiling: INSERT INTO tbl_user (employee_num, username, password, firstname, lastname, address, contact, van, salesman_code, station_code, machine_id) values('','E'|'M'|'P'|'0'|'0'|'0'|'3'|'|'|'s'|'a'|'m'
/ W/System.err:     at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
/ W/System.err:     at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
/ W/System.err:     at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
/ W/System.err:     at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
/ W/System.err:     at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
/ W/System.err:     at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
/ W/System.err:     at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1677)
 W/System.err:     at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608)

Answer 1

这里的单引号'是一个问题。这些生成无效的SQL查询。与其编写原始的SQL查询，不如使用ContentValues或已编译的语句。

Using prepared statements

String sql = "INSERT INTO " + tableName + " ( name, description ) VALUES ( ?, ? )";
SQLiteStatement stmt = db.compileStatement(sql);
stmt.bindString(1, "value");
stmt.execute();

Using Content Values

ContentValues values = new ContentValues();
long retvalue = 0;
values.put("_id", id_here);
values.put("text", your_text_here);
db.insert("table",null, values); // Check the docs for the correct parameters here

Answer 2

我相信您有很多问题。

您没有正确分割值，我想您希望String[] str = line.split("\\|")在 |
您在SQL中的值之间使用了不正确的分隔符。每个值都应使用逗号与另一个值分隔。
您将省略右括号。

但是

您可以使用SQLiteDatabase 插入便捷方法来简化事务，该方法将代表您构建SQL。

考虑以下工作示例（至少插入有问题的行）：-

数据库助手（最著名的是 addUser 方法）：-

public class DBHelper extends SQLiteOpenHelper {

    public static final String DBNAME = "mydb";
    public static final int DBVERSION = 1;

    public static final String TABLENAME = "tbl_user";
    public static final String USER_COL_EMPLOYEENUM = "employee_num";
    public static final String USER_COL_USERNAME = "username";
    public static final String USER_COL_PASSWORD = "password";
    public static final String USER_COL_FIRSTNAME = "firstname";
    public static final String USER_COL_LASTNAME = "lastname";
    public static final String USER_COL_ADDRESS = "address";
    public static final String USER_COL_CONTACT = "contact";
    public static final String USER_COL_VAN = "van";
    public static final String USER_COL_SALESMANCODE = "salesman_code";
    public static final String USER_COL_STATIONCODE = "station_code";
    public static final String USER_COL_MACHINEID = "machine_id";

    SQLiteDatabase mDB;

    public DBHelper(Context context) {
        super(context, DBNAME, null, DBVERSION);
        mDB = this.getWritableDatabase();
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String user_crt = "CREATE TABLE If NOT EXISTS " + TABLENAME + "(" +
                USER_COL_EMPLOYEENUM + " TEXT PRIMARY KEY," +
                USER_COL_USERNAME + " TEXT UNIQUE," +
                USER_COL_PASSWORD + " TEXT," +
                USER_COL_FIRSTNAME + " TEXT," +
                USER_COL_LASTNAME + " TEXT," +
                USER_COL_ADDRESS + " TEXT," +
                USER_COL_CONTACT + " TEXT," +
                USER_COL_VAN + " TEXT," +
                USER_COL_SALESMANCODE + " TEXT, " +
                USER_COL_STATIONCODE + " TEXT," +
                USER_COL_MACHINEID + " TEXT" +
                ")";
        db.execSQL(user_crt);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int i, int i1) {

    }

    public long addUser(String employeeNumber,
                        String userName,
                        String password,
                        String firstname,
                        String lastname,
                        String address,
                        String contact,
                        String van,
                        String salesmanCode,
                        String stationCode,
                        String machineId) {

        ContentValues cv = new ContentValues();
        cv.put(USER_COL_EMPLOYEENUM,employeeNumber);
        cv.put(USER_COL_USERNAME,userName);
        cv.put(USER_COL_PASSWORD,password);
        cv.put(USER_COL_FIRSTNAME,firstname);
        cv.put(USER_COL_LASTNAME,lastname);
        cv.put(USER_COL_ADDRESS,address);
        cv.put(USER_COL_CONTACT,contact);
        cv.put(USER_COL_VAN,van);
        cv.put(USER_COL_SALESMANCODE,salesmanCode);
        cv.put(USER_COL_STATIONCODE,stationCode);
        cv.put(USER_COL_MACHINEID,machineId);
        return mDB.insert(TABLENAME,null,cv);
    }

    public void logAll() {
        Cursor csr = mDB.query(TABLENAME,null,null,null,null,null,null);
        while (csr.moveToNext()) {
            StringBuilder sb = new StringBuilder(" Row ").append(String.valueOf(csr.getPosition()));
            for (int i =0; i < csr.getColumnCount(); i++) {
                sb.append("\n\tColumn ").append(csr.getColumnName(i)).append(" has a value of ").append(csr.getString(i));
            }
            Log.d("TABLEINFO",sb.toString());
        }
        csr.close();
    }
}

这被用于活动中，类似于：-

public class MainActivity extends AppCompatActivity {

    DBHelper mDBHlpr;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mDBHlpr = new DBHelper(this);

        String currentline = "EMP0003|sample|S@mple|SATO|TEST|destination|00008888|ST0001|EMP0003|East Location|0000001XABC";

        String[] values = currentline.split("\\|"); //<<<<<<<<<< SPLT at each |

        // Only use if there are the 11 columns
        if (values.length == 11) {
            mDBHlpr.addUser(
                    values[0],
                    values[1],
                    values[2],
                    values[3],
                    values[4],
                    values[5],
                    values[6],
                    values[7],
                    values[8],
                    values[9],
                    values[10]
            );
        }
        mDBHlpr.logAll(); //<<<<<<<<<< Write the data in the table to the log
    }
}

运行时将产生（这似乎是您想要的结果）：-

11-06 08:34:29.022 1574-1574/? D/TABLEINFO:  Row 0
      Column employee_num has a value of EMP0003
      Column username has a value of sample
      Column password has a value of S@mple
      Column firstname has a value of SATO
      Column lastname has a value of TEST
      Column address has a value of destination
      Column contact has a value of 00008888
      Column van has a value of ST0001
      Column salesman_code has a value of EMP0003
      Column station_code has a value of East Location
      Column machine_id has a value of 0000001XABC

如您所见，构建SQL无需花费时间，它是为您构建的。

P.S。我假设员工号应该是唯一的，并因此使其成为主键（这将阻止添加重复项）。

您可以通过使用（在根据列名包括 addUser 方法或同等方法之后，对上述内容进行调整（强烈建议您对列名采用常量而不是硬性表示）编码它们））：-

    while ((line = buffer.readLine()) !=null ) {
        String[] values = line.split("\\|"); //<<<<<<<<<< SPLIT at each |

        // Only use if there are the 11 columns
        if (values.length == 11) {
            mydb.addUser(
                    values[0],
                    values[1],
                    values[2],
                    values[3],
                    values[4],
                    values[5],
                    values[6],
                    values[7],
                    values[8],
                    values[9],
                    values[10]
            );
        }
    }

将CSV文件导入到SQLite

2 个答案:

但是