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🗣 Wd提问: Delphi MySQL

🤖 Ai回答:
Connecting a Delphi application to a MySQL database can be achieved using various methods、Here's a structured guide to help you get started:

1、Install MySQL Connector/ODBC Driver
Download the MySQL Connector/ODBC (available on [MySQL's website](https://dev.mysql.com/downloads/connector/odbc/)).
Install the driver and create a Data Source Name (DSN) during installation (or configure it later via the ODBC Administrator).

2、Choose a Connectivity Method in Delphi
Delphi offers multiple ways to interact with MySQL:

A、Using `TSQLConnection` (Modern Approach)
Available in Delphi 10.4+ with the Data Access library:
delphi
// Create a TSQLConnection component (e.g., SQLConnection1)
SQLConnection1.Driver := 'MySQL';
SQLConnection1.Database := 'your_database';
SQLConnection1.User := 'username';
SQLConnection1.Password := 'password';
SQLConnection1.Open;

// Execute a query
SQLQuery1.SQL.Text := 'SELECT * FROM users WHERE id = :id';
SQLQuery1.Parameters.ParamByName('id').Value := 1;
SQLQuery1.Open;

B、Using FireDAC (Recommended for Performance)
FireDAC is Delphi's high-performance data access library (available in XE2+):
delphi
// Create a TFDConnection component (e.g., FDConnection1)
FDConnection1.Params.Add('DriverID=MySQL');
FDConnection1.Params.Add('Database=your_database');
FDConnection1.Params.Add('User_Name=username');
FDConnection1.Params.Add('Password=password');
FDConnection1.Open;

// Execute a query
FDQuery1.SQL.Text := 'SELECT * FROM users WHERE name = :name';
FDQuery1.Parameters.ParamByName('name').Value := 'John';
FDQuery1.Open;

C、Using ADO Components (Legacy)
Requires the Microsoft OLE DB Provider for ODBC:
delphi
// Create a TADOConnection component (e.g., ADOConnection1)
ADOConnection1.ConnectionString :=
'Provider=MSDASQL;' +
'Data Source=YourDSNName;' + // Use the DSN created earlier
'User ID=username;' +
'Password=password;';
ADOConnection1.Open;

// Execute a query
ADOQuery1.SQL.Text := 'SELECT * FROM products';
ADOQuery1.Open;

3、Key Tips
Parameterized Queries: Always use parameters to prevent SQL injection.
Transactions: Use `TSQLTransaction` or `TFDTransaction` for atomic operations.
Error Handling: Wrap database operations in try/finally blocks.
Character Sets: Ensure the MySQL connection uses UTF8 (`SET NAMES utf8mb4`).

4、Example: Full CRUD Operation with FireDAC
delphi
procedure InsertUser(FDConnection: TFDConnection; const Name, Email: string);
var
FDCommand: TFDCommand;
begin
FDCommand := FDConnection.CreateCommand;
FDCommand.CommandText :=
'INSERT INTO users (name, email) VALUES (:name, :email)';
FDCommand.Parameters.ParamByName('name').Value := Name;
FDCommand.Parameters.ParamByName('email').Value := Email;
FDCommand.Execute;
end;

5、Common Issues
Missing Drivers: Ensure MySQL Connector/ODBC is installed.
Permission Errors: Check MySQL user privileges.
Timeouts: Increase `ConnectionLifeTime` in FireDAC if needed.

Let me know if you need further clarification! 😊

Ai作答

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