我有这些代码使用ucanaccess更新我的ms访问数据库。我的代码工作如果我更新我的数据库的第一行，但问题是如果我更新第二行直到最后一行出现此错误。
“net.ucanaccess.jdbc.UcanaccessSQLException：完整性约束违规：唯一约束或索引违规; SYS_PK_10339表：EMPLOYEETABLE2”
我怀疑我在ms访问设置中犯了一个错误，我的主键是Employee Name，其数据类型是Text。
public void actionPerformed(ActionEvent e)
{
String employeeName = endrollNameFields.getText();
String employeeAddress = endrollAddressFields.getText();
String employeeStatus = endrollEmployeestatusFields.getText();
String employeeDateOfMembership = dateOfMembershipFields.getText();
String employeeAge = ageFields.getText();
String employeMStatus = maritalstatusFields.getText();
String employeeBloodType = bloodTypeFields.getText();
String employeeGender = genderFields.getText();
String beginningCapital = beginningCapitalFields.getText();
String grossSalary = grossSalaryFields.getText();
String salaryDeductions = salaryDeductionFields.getText();
String netSalary = netSalaryFields.getText();
try
{
//------------CREATE CONNECTION TO DATA BASE--------------/
String DBPAD = "sourceFolder/employeeTable2.mdb";
String DB = "jdbc:ucanaccess://" + DBPAD;
con = DriverManager.getConnection(DB);
st = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql = "Select * FROM employeeTable2";
rs = st.executeQuery(sql);
if (rs != null)
while (rs.next())
{
rs.updateString("Employee Name", employeeName);
rs.updateString("Employee Age", employeeAge);
rs.updateString("Employee Address", employeeAddress);
rs.updateString("Employee Marital Status", employeMStatus);
rs.updateString("Employee Date of Membership", employeeDateOfMembership);
rs.updateString("Employee Blood Type", employeeBloodType);
rs.updateString("Employee Status", employeeStatus);
rs.updateString("Employee Gender", employeeGender);
rs.updateString("Beginning Capital", beginningCapital);
rs.updateString("Gross Salary", grossSalary);
rs.updateString("Salary Deductions", salaryDeductions);
rs.updateString("Net Salary", netSalary);
rs.updateRow();
}
st.close();
st = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
String sql1 = "select * from employeeTable2";
rs = st.executeQuery(sql1);
JOptionPane.showMessageDialog(null, "<html>" + "<font color=\"#008000\">" + "<html><span style='font-size:1.5em'>Update to Data Base is Successful");
endrollNameFields.setText(" ");
endrollAddressFields.setText(" ");
endrollEmployeestatusFields.setText(" ");
dateOfMembershipFields.setText(" ");
ageFields.setText(" ");
maritalstatusFields.setText(" ");
genderFields.setText(" ");
bloodTypeFields.setText(" ");
beginningCapitalFields.setText(" ");
grossSalaryFields.setText(" ");
salaryDeductionFields.setText(" ");
netSalaryFields.setText(" ");
}
catch(Exception e1)
{
JOptionPane.showMessageDialog(null, e1);
}
}
});
答案 0 :(得分：0)
您正在尝试修改主键列Employee Name，这会导致重复。这是因为您从employeeTable2中选择了所有行并尝试将它们全部更新为相同的值
要插入新值，请使用INSERT语句，例如......
String employeeName = endrollNameFields.getText();
String employeeAddress = endrollAddressFields.getText();
String employeeStatus = endrollEmployeestatusFields.getText();
String employeeDateOfMembership = dateOfMembershipFields.getText();
String employeeAge = ageFields.getText();
String employeMStatus = maritalstatusFields.getText();
String employeeBloodType = bloodTypeFields.getText();
String employeeGender = genderFields.getText();
String beginningCapital = beginningCapitalFields.getText();
String grossSalary = grossSalaryFields.getText();
String salaryDeductions = salaryDeductionFields.getText();
String netSalary = netSalaryFields.getText();
String DBPAD = "sourceFolder/employeeTable2.mdb";
String DB = "jdbc:ucanaccess://" + DBPAD;
try (Connection con = DriverManager.getConnection(DB)) {
try (PreparedStatement stmt = con.prepareStatement("insert into employeeTable2 ("
+ "'Employee Name', "
+ "'Employee Age', "
+ "'Employee Address', "
+ "'Employee Marital Status', "
+ "'Employee Date of Membership', "
+ "'Employee Blood Type'"
+ "'Employee Status',"
+ "'Employee Gender',"
+ "'Beginning Capital',"
+ "'Gross Salary',"
+ "'Salary Deductions',"
+ "'Net Salary') values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)")) {
stmt.setString(1, employeeName);
stmt.setString(2, employeeAge);
stmt.setString(3, employeeAddress);
stmt.setString(4, employeMStatus);
stmt.setString(5, employeeDateOfMembership);
stmt.setString(6, employeeBloodType);
stmt.setString(7, employeeStatus);
stmt.setString(8, employeeGender);
stmt.setString(9, beginningCapital);
stmt.setString(10, grossSalary);
stmt.setString(11, salaryDeductions);
stmt.setString(12, netSalary);
JOptionPane.showMessageDialog(null, "<html>" + "<font color=\"#008000\">" + "<html><span style='font-size:1.5em'>Update to Data Base is Successful");
endrollNameFields.setText(" ");
endrollAddressFields.setText(" ");
endrollEmployeestatusFields.setText(" ");
dateOfMembershipFields.setText(" ");
ageFields.setText(" ");
maritalstatusFields.setText(" ");
genderFields.setText(" ");
bloodTypeFields.setText(" ");
beginningCapitalFields.setText(" ");
grossSalaryFields.setText(" ");
salaryDeductionFields.setText(" ");
netSalaryFields.setText(" ");
}
} catch (Exception e1) {
JOptionPane.showMessageDialog(null, e1);
}
现在，如果要更新现有行，只需使用UPDATE语句，或使用当前的编码样式，选择与员工姓名相匹配的行并更新该行，但是，这假设名称没有改变......
String employeeName = endrollNameFields.getText();
String employeeAddress = endrollAddressFields.getText();
String employeeStatus = endrollEmployeestatusFields.getText();
String employeeDateOfMembership = dateOfMembershipFields.getText();
String employeeAge = ageFields.getText();
String employeMStatus = maritalstatusFields.getText();
String employeeBloodType = bloodTypeFields.getText();
String employeeGender = genderFields.getText();
String beginningCapital = beginningCapitalFields.getText();
String grossSalary = grossSalaryFields.getText();
String salaryDeductions = salaryDeductionFields.getText();
String netSalary = netSalaryFields.getText();
String DBPAD = "sourceFolder/employeeTable2.mdb";
String DB = "jdbc:ucanaccess://" + DBPAD;
try (Connection con = DriverManager.getConnection(DB)) {
try (PreparedStatement stmt = con.prepareStatement("Select * FROM employeeTable2 where 'Employee Nam' == ?",
ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_UPDATABLE)) {
stmt.setString(1, employeeName);
try (ResultSet rs = stmt.executeQuery()) {
if (rs.next()) {
rs.updateString("Employee Name", employeeName);
rs.updateString("Employee Age", employeeAge);
rs.updateString("Employee Address", employeeAddress);
rs.updateString("Employee Marital Status", employeMStatus);
rs.updateString("Employee Date of Membership", employeeDateOfMembership);
rs.updateString("Employee Blood Type", employeeBloodType);
rs.updateString("Employee Status", employeeStatus);
rs.updateString("Employee Gender", employeeGender);
rs.updateString("Beginning Capital", beginningCapital);
rs.updateString("Gross Salary", grossSalary);
rs.updateString("Salary Deductions", salaryDeductions);
rs.updateString("Net Salary", netSalary);
rs.updateRow();
JOptionPane.showMessageDialog(null, "<html>" + "<font color=\"#008000\">" + "<html><span style='font-size:1.5em'>Update to Data Base is Successful");
endrollNameFields.setText(" ");
endrollAddressFields.setText(" ");
endrollEmployeestatusFields.setText(" ");
dateOfMembershipFields.setText(" ");
ageFields.setText(" ");
maritalstatusFields.setText(" ");
genderFields.setText(" ");
bloodTypeFields.setText(" ");
beginningCapitalFields.setText(" ");
grossSalaryFields.setText(" ");
salaryDeductionFields.setText(" ");
netSalaryFields.setText(" ");
} else {
// No matching row, maybe do a insert insetad
}
}
}
} catch (SQLException e1) {
JOptionPane.showMessageDialog(null, e1);
}
另一种方法可能是维护对原始ResultSet的引用，该引用用于加载数据并简单地用新数据更新“当前”行，但您需要小心确保光标位置未更改为新行。否则，您应该保留该行的原始密钥（Employee Name）的副本，并在您要执行更新时使用该副本从数据库中选择数据...
就个人而言，我认为UPDATE声明会更简单......
您还应该更加谨慎地使用您的资源，如果代码中发生异常，则不太可能关闭未完成的开放资源。
请查看The try-with-resources Statement了解更多详情
（ps自从我对MS Access数据库做了任何工作以来，已经很长时间了，所以我的列引用可能错了）