Question

我在java中编写代码，例如

Double Alish = Double.valueOf(productAlishText.getText().toString());
Double Satish = Double.valueOf(productSatishText.getText().toString());
Query = "INSERT INTO MALLAR (CUSTOMERID,PRODUCTNAME,PRODUCTALISH,PRODUCTSATISH) "
                    + "VALUES ('" + getEkspeditorIndex() + "','" + productAdiText.getText() + "','" + Alish+ "','" + Satish+ "')";
stat.execute(Query);

但是此代码会出现此错误。

SQLSyntaxErrorException：类型为＆＃39; DOUBLE＆＃39;的列不能保持价值观类型＆＃39; CHAR＆＃39;

Answer 1

您也引用了Double个值。删除引号。

Query = "INSERT INTO MALLAR (CUSTOMERID,PRODUCTNAME,PRODUCTALISH,PRODUCTSATISH) "
        + "VALUES ('" + getEkspeditorIndex() + "','" + productAdiText.getText()
        + "'," + Alish+ "," + Satish+ ")";

请注意，上面的''和Alish周围没有引号Satish。

但是，我建议你改用PreparedStatement。您不仅可以摆脱这种连接问题，还可以防止SQL注入攻击。

PreparedStatement pstmt = connection.prepareStatement("INSERT INTO MALLAR " 
    + "(CUSTOMERID, PRODUCTNAME, PRODUCTALISH, PRODUCTSATISH) VALUES (?, ?, ?, ?)");

pstmt.setString(1, getEkspeditorIndex());
pstmt.setString(2, productAdiText.getText());
pstmt.setDouble(3, Alish);
pstmt.setDouble(4, Satish);

pstmt.executeUpdate();

SQLSyntaxErrorException：'DOUBLE'类型的列不能包含'CHAR'类型的值

1 个答案: