java - 所有 ListView 数据仅插入一行

Question

我有一个包含多行的ListView。当我将 ListView 中的条目插入 SQL 数据库时，所有条目都会插入到一行中。

我使用字符串生成器从 View 中获取所有条目。

如何解决这个问题？

StringBuilder sb = new StringBuilder();

StringBuilder sb2 = new StringBuilder();

StringBuilder sb3 = new StringBuilder();
//get data form text view

for(int i=0; i<simpleAdapter.getCount(); i++) {
    String a = ((TextView) findViewById(R.id.al)).getText().toString();
    String b = ((TextView) findViewById(R.id.sh)).getText().toString();
    String c = ((TextView) findViewById(R.id.acc)).getText().toString();

    simpleAdapter.getItem(i).toString();
    sb.append(a);
    sb.append("\n");
    sb2.append(b);
    sb2.append("\n");
    sb3.append(c);
    sb3.append("\n");

}

String text = sb.toString();
String text2 = sb2.toString();
String text3 = sb3.toString();

//my sql connection insert query
try {
    Connection con = connectionClass.CONN();
    if (con == null) {
        Toast.makeText(getApplicationContext(), "Error in connection with SQL server", Toast.LENGTH_LONG).show();
    } else {

        String query = "INSERT INTO suigen.TransAlmiraShelf (Almira, Shelf, AccessionNo) VALUES('" + String.valueOf(text) + "','" + String.valueOf(text2) + "','" + String.valueOf(text3) + "')";

        Statement stmt = con.createStatement();
        stmt.execute(query);
        Toast.makeText(Main13Activity.this, "Your Data Successfully Saved", Toast.LENGTH_LONG).show();
    }

}
catch (Exception ex) {
     Toast.makeText(getApplicationContext(), "Exceptions", Toast.LENGTH_LONG).show();
}

Answer 1

使用 JDBC 从表中获取值列表

Connection connection = DriverManager.getConnection("URL", "USERNAME", 
"PASSWORD");
PreparedStatement statement = connection.prepareStatement("select * from 
table");
ResultSet resultSet = statement.executeQuery();

if (resultSet != null) {
while (resultSet.next()) {
    ResultSetMetaData resultSetMetaData = resultSet.getMetaData();
    for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {

        int type = resultSetMetaData.getColumnType(i);
        if (type == Types.VARCHAR || type == Types.CHAR) {
             System.out.println(resultSet.getString(i));
        } else {
             System.out.println(resultSet.getLong(i));
        }
    }

     System.out.println("-----------");
}

}