如何在单击按钮而不清除现有行的情况下将新行从数据库添加到 jTable
How to add new rows into a jTable from database while button click without clearing existing rows
如何在单击按钮时将新行从数据库添加到 jTable 中而不清除 jTable 中的现有行?
我尝试了很多方法。但没有成功。帮助
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
好的 。但是这里我在 DefaultTableModel
中遇到错误
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);}
新代码
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);
}
**但是在这里我得到一个 NullpointException 错误!我如何 select jTable1 作为上面代码中的 table?
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 table 模型。您正在创建新的 table 模型并将其设置在 table 上,包含数据的旧模型已丢失。
在评论中提出以下要求后:
这是一种方法。
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
如何在单击按钮时将新行从数据库添加到 jTable 中而不清除 jTable 中的现有行?
我尝试了很多方法。但没有成功。帮助
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 好的 。但是这里我在 DefaultTableModel
中遇到错误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);}
新代码
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);
}
**但是在这里我得到一个 NullpointException 错误!我如何 select jTable1 作为上面代码中的 table?
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 table 模型。您正在创建新的 table 模型并将其设置在 table 上,包含数据的旧模型已丢失。
在评论中提出以下要求后:
这是一种方法。
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