c# - 错误:尝试在windoes表单c#程序中保存数据时,“:”处或附近出现42601语法错误
问题描述
我正在制作一个小程序,允许我将数据插入到与 PostgreSQL 连接的数据表中。所有功能在 postgresql 上都运行良好:选择、插入、更新和删除。这是代码:
private void FrmTeachers_Load(object sender, EventArgs e)
{
conn = new NpgsqlConnection(connstring);
Select();
//dgvTabela.Columns["docente_id"].HeaderText = "Teachers ID";
}
private void Select()
{
try
{
conn.Open();
sql = @"select * from docen_selecionar()";
cmd = new NpgsqlCommand(sql, conn);
dt = new DataTable();
dt.Load(cmd.ExecuteReader());
conn.Close();
dgvTabela.DataSource = null;
dgvTabela.DataSource = dt;
}
catch (Exception ex)
{
conn.Close();
MessageBox.Show("Error: " + ex.Message);
}
}
private void DgvTabela_CellContentClick(object sender, DataGridViewCellEventArgs e)
{
if (e.RowIndex >= 0)
{
txtName.Text = dgvTabela.Rows[e.RowIndex].Cells["_docente_id"].Value.ToString();
txtID.Text = dgvTabela.Rows[e.RowIndex].Cells["_nome_docente"].Value.ToString();
txtVAT.Text = dgvTabela.Rows[e.RowIndex].Cells["_nif_number"].Value.ToString();
txtDepart.Text = dgvTabela.Rows[e.RowIndex].Cells["_departamento"].Value.ToString();
txtDegree.Text = dgvTabela.Rows[e.RowIndex].Cells["_grau_academico"].Value.ToString();
}
}
private void btnRegister_Click(object sender, EventArgs e)
{
rowIndex = -1;
txtName.Enabled = txtDegree.Enabled = txtDepart.Enabled = txtID.Enabled = txtVAT.Enabled = true;
txtName.Text = txtDegree.Text = txtDepart.Text = txtID.Text = txtVAT.Text = null;
txtName.Select();
}
private void btnUpdate_Click(object sender, EventArgs e)
{
if (rowIndex < 0)
{
MessageBox.Show("Please choose a Teacher to update");
return;
}
txtName.Enabled = txtDegree.Enabled = txtDepart.Enabled = txtID.Enabled = txtVAT.Enabled = true;
}
private void btnDelete_Click(object sender, EventArgs e)
{
if (rowIndex < 0)
{
MessageBox.Show("Please choose a Teacher ID to delete");
return;
}
try
{
conn.Open();
sql = @"select * from docen_apagar(:_docente_id)";
cmd = new NpgsqlCommand(sql, conn);
cmd.Parameters.AddWithValue("_docente_id", int.Parse(dgvTabela.Rows[rowIndex].Cells["docente_id"].Value.ToString()));
if ((int)cmd.ExecuteScalar() == 1)
{
MessageBox.Show("Teacher deleted successfully");
rowIndex = -1;
Select();
}
conn.Close();
}
catch (Exception ex)
{
conn.Close();
MessageBox.Show("Delete fail. Please try again. Error:" + ex.Message);
}
}
//save - esqueci-me de alterar o name
private void iconButton1_Click(object sender, EventArgs e)
{
int result = 0;
if (rowIndex < 0) //insert
{
try
{
conn.Open();
sql = @"select * from docen_registar(:_docente_id,:_nome_docente,:_departmento,:_grau_academico,:_nif_number)";
cmd = new NpgsqlCommand(sql, conn);
cmd.Parameters.AddWithValue("_nome_docente", txtName.Text);
cmd.Parameters.AddWithValue("_docente_id", txtID.Text);
cmd.Parameters.AddWithValue("_departamento", txtDepart.Text);
cmd.Parameters.AddWithValue("_grau_academico", txtDegree.Text);
cmd.Parameters.AddWithValue("_nif_number", txtVAT.Text);
result = (int)cmd.ExecuteScalar();
conn.Close();
if (result == 1)
{
MessageBox.Show("Inserted new Teacher successfully");
Select();
}
else
{
MessageBox.Show("Inserted fail");
}
}
catch (Exception ex)
{
conn.Close();
MessageBox.Show("Inserted fail, please try again. Error: " + ex.Message);
}
}
else //update
{
try
{
conn.Open();
sql = @"select * from docen_update(:_docente_id,:_nome_docente,:_departmento,:_grau_academico,:_nif_number)";
cmd = new NpgsqlCommand(sql, conn);
cmd.Parameters.AddWithValue("_docente_id", int.Parse(dgvTabela.Rows[rowIndex].Cells["docente_id"].Value.ToString()));
cmd.Parameters.AddWithValue("_nome_docente", txtName.Text);
cmd.Parameters.AddWithValue("_docente_id", txtID.Text);
cmd.Parameters.AddWithValue("_departamento", txtDepart.Text);
cmd.Parameters.AddWithValue("_grau_academico", txtDegree.Text);
cmd.Parameters.AddWithValue("_nif_number", txtVAT.Text);
result = (int)cmd.ExecuteScalar();
conn.Close();
if (result == 1)
{
MessageBox.Show("Successfully updated");
Select();
}
else
{
MessageBox.Show("Updated fail, please try again.");
}
}
catch (Exception ex)
{
conn.Close();
MessageBox.Show("Updated fail, please try again. Error: " + ex.Message);
}
}
result = 0;
txtName.Text = txtDegree.Text = txtDepart.Text = txtID.Text = txtVAT.Text = null;
txtName.Enabled = txtDegree.Enabled = txtDepart.Enabled = txtID.Enabled = txtVAT.Enabled = false;
}
}
}
我正在尝试创建 4 个按钮:插入、更新、删除和保存,当我单击保存时出现以下错误:“错误:“:”或附近出现 42601 语法错误
我真的不知道它是什么。
有人能帮我吗?
解决方案
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