Question

以下是我使用的代码：

byte[] bkey = key.getEncoded();
String query = "INSERT INTO keytable (name, key) VALUES (?,?)";
PreparedStatement pstmt = (PreparedStatement) connection.prepareStatement(query);
pstmt.setString(1, "test");
pstmt.setBytes(2, bkey);
pstmt.execute();

以下是我遇到的错误：

com.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key) VALUES ('test',_binary'?ʾ??s??u\'?}p?u')' at line 1

我有MySQL 5.0.41和mysql-connector-java-5.1.7-bin.jar作为JDBC库。有人可以帮帮我吗？提前谢谢！

Answer 1

问题是你的名为“key”的列是SQL中的保留字。用反引号围绕它，事情应该有效。更好的是，考虑将列重命名为不是SQL保留字的内容。我已经使用下面的代码证明了这一点：

MySQL表：

create table keytable (name varchar(255) not null, `key` blob not null);

Java代码：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class MySQLBlobInsert {

    public static void main(String[] args) {
        try {
            Class.forName("com.mysql.jdbc.Driver").newInstance();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        Connection conn = null;
        try {
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "password");
            byte[] bkey = "This is some binary stuff".getBytes();
            String query = "INSERT INTO keytable (name, `key`) VALUES (?,?)";
            PreparedStatement pstmt = conn.prepareStatement(query);
            pstmt.setString(1, "test");
            pstmt.setBytes(2, bkey);
            pstmt.execute();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            if (conn != null) {
                try { conn.close(); } catch (SQLException e) {}
            }
        }
        System.out.println("done :)");
    }
}

Answer 2

尝试使用“setBinaryStream（）”而不是“setBytes（）”，并传递一个在字节数组上构造的ByteArrayInputStream。当然，这假定分配给列的数据类型可以存储字节...确保它是BLOB，BINARY或VARBINARY。

此外，使用反引号来封闭您的对象。 “key”是一个SQL关键字，除此之外它只是一个好习惯：

String query = "INSERT INTO `keytable` (`name`, `key`) VALUES (?,?)";

Answer 3

您应该添加二进制流。你有权访问输入流吗？喜欢这个..

FileInputStream input = new FileInputStream("myfile.gif");
String query = "INSERT INTO `keytable` (`name`, `key`) VALUES (?,?)";
PreparedStatement pstmt = (PreparedStatement) connection.prepareStatement(query);
pstmt.setString(1, "test");
pstmt.setBinaryStream(2, input, input.available());

无法使用java将byte []插入MySQL

3 个答案: