consulta si tabla sql esta vacía
Publicado por Alejandro (21 intervenciones) el 03/09/2019 16:34:25
Necesito saber si la tabla de la base de datos esta vacía o no..
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public void Cargarnum(){
PreparedStatement pst = null; ResultSet rs = null; ResultSet rst = null;String num = "1";
String ncomp = "";
int entero;
int total;
String total2 = "";
try{String sql = "SELECT count(*) FROM ventas_clientes";
pst =connect().prepareStatement(sql);
rst = pst.executeQuery();
}catch(Exception e){
System.err.println("Error" + e);
}if(rst == null){
lblncomp.setText(num);
}else{
try{String sql = "SELECT ncomp FROM ventas_clientes";
pst =connect().prepareStatement(sql);
rs = pst.executeQuery();
while(rs.next()){
ncomp = rs.getString("ncomp");
entero = Integer.parseInt(ncomp);
total = entero +1;
total2 = Integer.toString(total);
}lblncomp.setText(total2);
}catch(Exception e){
System.err.println("Error" + e);
} } }Valora esta pregunta
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