java-如何在单击按钮时不清除现有行就将新行从数据库添加到jTable中
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在不清除jTable中的现有行的情况下,如何在单击按钮时从数据库向jTable中添加新行?
我尝试了很多方法.但是没有成功.救命
String SQL = "SELECT name,price FROM items WHERE ID = ' "+jTextField1.getText()+" ' ";
pst = Conn.prepareStatement(sql);
rs = pst.executeQuery();
jTable1.setModel(DbUnits.resultSetToTableModel(rs));
编辑:-
在所有答案的帮助下,我将代码更改为以下代码,但是
好 .但是这里我在DefaultTableModel中得到一个错误
String sql = "SELECT name,price FROM items WHERE ID = '"+jtxt1.getText()+"'";
pst = conn.prepareStatement(sql);
rs=pst.executeQuery();
DefaultTableModel model = new DefaultTabelModel(new String[]{"Name","Price"},0);
Vector row = new Vector();
while(rs.next())
{
String d = rs.getString("name");
String e = rs.getString("price");
row.add(new Object[]{d,e});
model.addRow(row);}
新密码
String sql = "SELECT name,price FROM items WHERE ID = '"+jtxt1.getText()+"'";
pst = conn.prepareStatement(sql);
rs=pst.executeQuery();
DefaultTableModel model=(DefaultTableModel)jTable1.getModel();
Vector row = new Vector();
row.add(rs);
model.addRow(row);
最新代码
ResultSetMetaData metaData;
public void metaData() throws SQLException {
this.metaData = rs.getMetaData();
}
String sql = "SELECT name,price FROM items WHERE ID = '"+jtxt1.getText()+"'";
pst = conn.prepareStatement(sql);
rs=pst.executeQuery();
int columnCount = metaData.getColumnCount();
Vector<String> columnNames = new Vector<String>();
for (int column = 1; column <= columnCount; column++) {
columnNames.add(metaData.getColumnName(column));
System.out.println("ColumnNames "+columnNames );
}
DefaultTableModel datamodel = new DefaultTableModel(columnNames, 0);
jTable1.setModel(datamodel);
while (rs.next()) {
Vector<String> vector = new Vector<String>();
for (int columnIndex = 1; columnIndex <= columnCount; columnIndex++) {
vector.add(rs.getString(columnIndex));
}
datamodel.addRow(vector);
}
**但是在这里我得到了NullpointException错误!我该如何选择jTable1作为以上代码中的表?
解决方法:
处理ResultSet中的每一行数据,并创建一个Vector和use this method,以将数据插入表模型中.您正在创建新的表模型并将其设置在表上,带有数据的旧模型将丢失.
在下面的评论请求之后:
这是做到这一点的一种方法.
Vector<Vector<String>> data=new Vector<>();
//Fill this Vector above with the initial data
Vector<String> columns=new Vector<String>();
//Fill this with column names
DefaultTableModel tableModel=new DefaultTableModel(data, columns);
JTable table=new JTable(tableModel);
//Display the table as you like
... //Query the database and get the ResultSet (let's call it rs)
while(rs.next){
Vector<String> newRow=new Vector<>();
//Get the data from the resultset and fill this new row
tableModel.addRow(newRow);
}//while closing
标签:netbeans-8,java,mysql,swing 来源: https://codeday.me/bug/20191012/1902308.html