/// <summary>
/// 获取列表
/// </summary>
/// <returns>Users</returns>
public static IEnumerable <User> QueryUsers()
{
using (var conn = SqLiteHelper.OpenConnection())
{
const string sql = "SELECT * FROM User WHERE Age=@Age;";
var users = conn.Query <User>(sql, new { Age = "15" });
return(users);
}
}
/// <summary>
/// 单条数据查询
/// </summary>
/// <returns>User</returns>
public static User QueryUser()
{
using (var conn = SqLiteHelper.OpenConnection())
{
const string sql = "SELECT * FROM User WHERE Id=@Id;";
var user = conn.Query <User>(sql, new { Id = 12 }).SingleOrDefault();
return(user);
}
}
/// <summary>
/// 删除
/// </summary>
/// <returns>结果</returns>
public static int DeleteWithSql()
{
using (var conn = SqLiteHelper.OpenConnection())
{
User user = new User {
Id = 15
};
const string sql = "DELETE FROM User WHERE Id=@Id;";
return(conn.Execute(sql, user));
}
}
/// <summary>
/// 1对1关联查询
/// </summary>
/// <returns>Users</returns>
public static IEnumerable <User> QueryUsers1()
{
using (var conn = SqLiteHelper.OpenConnection())
{
const string sql = "SELECT * FROM `User` as u INNER JOIN Role as r ON u.Id = r.Id;";
var users = conn.Query <User, Role, User>(sql, (user, role) =>
{
user.Role = role;
return(user);
});
return(users);
}
}
/// <summary>
/// 多表添加
/// </summary>
/// <returns>结果</returns>
public static int InsertWithSqlss()
{
int rows = 0;
using (var conn = SqLiteHelper.OpenConnection())
{
using (var transaction = conn.BeginTransaction())
{
try
{
List <User> users = new List <User>();
for (int i = 0; i < 50; i++)
{
User user = new User
{
Name = "Dapper" + i,
Address = "周口",
Age = "15" + i
};
users.Add(user);
}
const string userSql = "INSERT INTO User(Name,Address,Age)VALUES(@Name,@Address,@Age);";
rows = conn.Execute(userSql, users);
List <Role> roles = new List <Role>();
for (int i = 0; i < 20; i++)
{
Role role = new Role
{
Name = "Role" + i
};
roles.Add(role);
}
const string roleSql = "INSERT INTO Role(Name) VALUES(@Name);";
rows += conn.Execute(roleSql, roles);
transaction.Commit();
}
catch (Exception)
{
transaction.Rollback();
}
}
return(rows);
}
}
/// <summary>
/// 更新
/// </summary>
/// <returns>结果</returns>
public static int UpdateWithSql()
{
using (var conn = SqLiteHelper.OpenConnection())
{
User user = new User
{
Id = 14,
Name = "Dapper03",
Address = "太康",
Age = "687"
};
const string sql = "UPDATE User SET Name=@Name,Address=@Address,Age=@Age WHERE Id=@Id;";
return(conn.Execute(sql, user));
}
}
/// <summary>
/// 1对多关联查询
/// </summary>
/// <returns>Users</returns>
public static IEnumerable <User> QueryUsers2()
{
using (var conn = SqLiteHelper.OpenConnection())
{
const string sql = "SELECT * FROM `User` as u INNER JOIN Role as r ON u.Id = r.Id;";
var users = conn.Query <User, Role, User>(sql, (user, role) =>
{
if (user.Roles == null)
{
user.Roles = new List <Role>();
}
user.Roles.Add(role);
return(user);
}, splitOn: "Id");
return(users);
}
}
/// <summary>
/// 添加单条数据
/// </summary>
/// <returns>结果</returns>
public static int InsertWithSql()
{
using (var conn = SqLiteHelper.OpenConnection())
{
User user = new User
{
Name = "Dapper01",
Address = "周口",
Age = "15"
};
const string sql = "INSERT INTO User(Name,Address,Age)VALUES(@Name,@Address,@Age); SELECT LAST_INSERT_ID();";
var obj = conn.ExecuteScalar(sql, user);
if (obj != null)
{
var rows = Convert.ToInt32(obj);
return(rows);
}
return(0);
}
}
/// <summary>
/// 批量添加
/// </summary>
/// <returns>结果</returns>
public static int InsertWithSqls()
{
using (var conn = SqLiteHelper.OpenConnection())
{
List <User> users = new List <User>();
for (int i = 0; i < 50; i++)
{
User user = new User
{
Name = "Dapper" + i,
Address = "周口",
Age = "15" + i
};
users.Add(user);
}
const string sql = "INSERT INTO User(Name,Address,Age)VALUES(@Name,@Address,@Age);";
var rows = conn.Execute(sql, users);
return(rows);
}
}
/// <summary>
/// 多对多关联查询
/// </summary>
/// <returns>Users</returns>
public static IEnumerable <User> QueryUsers3()
{
using (var conn = SqLiteHelper.OpenConnection())
{
const string sql = "SELECT a.*,c.* FROM `User` AS a LEFT JOIN Relation b ON a.id = b.UserId LEFT JOIN Role c ON c.id=b.RoleId;";
var users = conn.Query <User, Role, User>(sql, (user, role) =>
{
if (role != null)
{
if (user.Roles == null)
{
user.Roles = new List <Role>();
}
user.Roles.Add(role);
}
return(user);
}, splitOn: "Id");
return(users);
}
}
/// <summary>
/// 分页查询
/// </summary>
/// <param name="condition">查询条件</param>
/// <param name="pageIndex">开始页</param>
/// <param name="pageSize">页大小</param>
/// <returns>结果集</returns>
public static IEnumerable <User> QueryPaging(User condition, int pageIndex, int pageSize)
{
using (var conn = SqLiteHelper.OpenConnection())
{
DynamicParameters dp = new DynamicParameters(condition);
StringBuilder sql = new StringBuilder("SELECT * FROM User");
sql.Append(" WHERE 1 = 1 ");
if (!string.IsNullOrWhiteSpace(condition.Name))
{
sql.Append(" AND Name = @Name ");
}
if (!string.IsNullOrWhiteSpace(condition.Age))
{
sql.Append(" AND Age = @Age ");
}
sql.Append(" LIMIT @StartRow,@Size");
dp.Add("@StartRow", pageIndex);
dp.Add("@Size", pageSize);
var users = conn.Query <User>(sql.ToString(), dp);
return(users);
}
}