相关疑难解决方法(0)

我曾多次尝试使用预处理语句,但它返回SQL异常.这是我的代码:

public ArrayList<String> name(String mobile, String password) {
    ArrayList<String> getdata = new ArrayList<String>();
    PreparedStatement stmt = null;
    try {
        String login = "select mobile, password from tbl_1 join tbl_2 on tbl_1.fk_id=2.Pk_ID where mobile=? and password=?";

        String data = "select * from tbl_2  where password='" + password + "'";

        PreparedStatement preparedStatement = conn.prepareStatement(login);

        preparedStatement.setString(1, mobile);
        preparedStatement.setString(1, password);

        ResultSet rs = preparedStatement.executeQuery(login);

        Statement stmts = (Statement) conn.createStatement();

        if (rs.next()) {
            System.out.println("Db inside RS");
            ResultSet data = stmts.executeQuery(data);

            while (data.next()) { /* looping …

我正在尝试使用Java中的PreparedStatement执行查询。

尝试执行查询时出现错误号1064（语法错误）。

我已经在MySQL查询浏览器中使用替代值测试了此方法，效果很好。

我的代码有什么问题？

以下是相关代码：

String query = "select MemberID, MemberName from members where MemberID = ? or MemberName = ?";
Connection conn = DriverManager.getConnection(DATABASE_URL, USERNAME, PASSWORD);
PreparedStatement s = conn.prepareStatement(query);
s.setInt(1, 2);
s.setString(2, "zen");
ResultSet rs = s.executeQuery(query);

这是我得到的例外：

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException：SQL语法有错误；检查与您的MySQL服务器版本相对应的手册，以获取在'？附近使用的正确语法。或MemberName =吗？在第1行

我试图将字符串数组和int数组传递给数据库.我正在尝试的代码如下,但这总是显示错误

您的SQL语法有错误; 检查与您的MySQL服务器版本相对应的手册,以便在第1行的'？,？)'附近使用正确的语法

Connection connection = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/javabase", "java", "password");
CompareAndCount compareAndCount = new CompareAndCount();
ReadWord bagOfWords = new ReadWord();
String[] listOfWords = bagOfWords.openFile();
int[] count =compareAndCount.compareWords();
for (int i = 0; i < listOfWords.length; i++) {
    String query = "INSERT INTO angry(tagwords,termfrequency) VALUES(?,?)";
    PreparedStatement pStmnt = (PreparedStatement) connection.prepareStatement(query);
    pStmnt.setString(1, listOfWords[i]);
    pStmnt.setLong(2, count[i]);
    pStmnt.executeUpdate(query);
}
connection.close();

我遇到了SQL问题.这是我的代码,我不知道为什么,也不知道修复它.我使用Java EE和Eclipse来做到这一点.

public void userLogin(String username,String password) {

   Connection conn = null;  
   PreparedStatement ps = null; 
   ResultSet rs = null;

   try {        
      conn = JDBCUtilsWithProperties.getConnection();
      String sql = "select * from users where username = ? and password = ?;";
      ps = conn.prepareStatement(sql);
      ps.setString(1,   username);
      ps.setString(2,   password);
      rs = ps.executeQuery(sql);

      if(rs.next()) {   
         System.out.println("SUCESS");
      } else {
         System.out.println("FAIL");
      }

      } catch (Exception e) {
         // TODO: handle exception
         e.printStackTrace();
      } finally {
         JDBCUtilsWithProperties.release(rs, ps, conn);
      }     
   }
}

public class JDBCUtilsWithProperties …