380 lines
13 KiB
C#
380 lines
13 KiB
C#
using Newtonsoft.Json.Linq;
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using Npgsql;
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using System;
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using System.Collections.Generic;
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using System.Data;
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using System.Data.SQLite;
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using System.Linq;
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namespace Ramitta
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{
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public class PostgreSQL : IDisposable
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{
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private NpgsqlConnection db;
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private bool disposed = false;
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// 构造函数，初始化数据库连接
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public PostgreSQL(string connectionString, bool readOnly = false)
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{
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var connString = connectionString;
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if (readOnly)
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{
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if (!connString.Contains("CommandTimeout"))
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{
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connString += ";CommandTimeout=0";
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}
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}
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db = new NpgsqlConnection(connString);
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db.Open();
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}
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// 创建表：根据表名和字段定义创建表
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public void CreateTable(string tableName, Dictionary<string, string> columns)
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{
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// 构建列定义的字符串
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var columnsDefinition = string.Join(", ", columns.Select(c => $"\"{c.Key}\" {MapDataType(c.Value)}"));
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string createTableQuery = $"CREATE TABLE IF NOT EXISTS \"{tableName}\" ({columnsDefinition});";
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using (var cmd = new NpgsqlCommand(createTableQuery, db))
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{
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cmd.ExecuteNonQuery();
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}
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}
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// 数据类型映射（SQLite到PostgreSQL）
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private string MapDataType(string sqliteType)
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{
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return sqliteType.ToUpper() switch
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{
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"INTEGER" => "INTEGER",
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"TEXT" => "TEXT",
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"REAL" => "REAL",
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"BLOB" => "BYTEA",
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"NUMERIC" => "NUMERIC",
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"BOOLEAN" => "BOOLEAN",
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"DATE" => "DATE",
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"DATETIME" => "TIMESTAMP",
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"TIMESTAMP" => "TIMESTAMP",
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_ => "TEXT" // 默认映射为TEXT
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};
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}
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// 获取数据库中所有表名
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public List<string> GetAllTableNames()
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{
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List<string> tableNames = new List<string>();
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string query = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public';";
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using (var cmd = new NpgsqlCommand(query, db))
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using (var reader = cmd.ExecuteReader())
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{
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while (reader.Read())
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{
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string tableName = reader.GetString(0);
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tableNames.Add(tableName);
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}
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}
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return tableNames;
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}
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// 向已存在的表中添加新列
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public void AddColumn(string tableName, string columnName, string columnType)
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{
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// 检查表是否存在
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if (!TableExists(tableName))
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{
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throw new ArgumentException($"表 '{tableName}' 不存在");
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}
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// 检查列是否已存在
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if (ColumnExists(tableName, columnName))
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{
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Console.WriteLine($"列 '{columnName}' 在表 '{tableName}' 中已存在");
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return;
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}
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// 构建添加列的SQL语句
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string addColumnQuery = $"ALTER TABLE \"{tableName}\" ADD COLUMN \"{columnName}\" {MapDataType(columnType)};";
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using (var cmd = new NpgsqlCommand(addColumnQuery, db))
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{
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cmd.ExecuteNonQuery();
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}
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Console.WriteLine($"已向表 '{tableName}' 添加列 '{columnName}'");
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}
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// 检查表是否存在
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private bool TableExists(string tableName)
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{
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string query = "SELECT count(*) FROM information_schema.tables WHERE table_schema = 'public' AND table_name = @tableName;";
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using (var cmd = new NpgsqlCommand(query, db))
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{
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cmd.Parameters.AddWithValue("@tableName", tableName);
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var result = cmd.ExecuteScalar();
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return Convert.ToInt64(result) > 0;
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}
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}
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// 检查列是否已存在
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private bool ColumnExists(string tableName, string columnName)
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{
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string query = "SELECT column_name FROM information_schema.columns WHERE table_schema = 'public' AND table_name = @tableName;";
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using (var cmd = new NpgsqlCommand(query, db))
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{
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cmd.Parameters.AddWithValue("@tableName", tableName);
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using (var reader = cmd.ExecuteReader())
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{
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while (reader.Read())
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{
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if (reader["column_name"].ToString().Equals(columnName, StringComparison.OrdinalIgnoreCase))
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{
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return true;
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}
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}
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}
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}
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return false;
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}
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// 批量添加多个列
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public void AddColumns(string tableName, Dictionary<string, string> columns)
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{
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foreach (var column in columns)
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{
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AddColumn(tableName, column.Key, column.Value);
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}
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}
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// 插入数据：向指定表插入一条记录
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// 参数: tableName - 表名
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// 参数: columnValues - 字段和对应值的字典
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// 例如: InsertData("Users", new Dictionary<string, object> { {"Name", "John"}, {"Age", 30} });
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public void InsertData(string tableName, Dictionary<string, object> columnValues)
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{
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// 构建列名字符串（添加引号防止保留关键字冲突）
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var columns = string.Join(", ", columnValues.Keys.Select(k => $"\"{k}\""));
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// 判断是否需要 JSON 转换，并构建参数占位符
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var parameters = columnValues.Keys.Select(k =>
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{
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var value = columnValues[k];
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if (value is JObject || value is JArray) // 判断是否是 JObject 或 JArray
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{
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return $"@{k}::json";
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}
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return $"@{k}";
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});
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// 构建插入语句
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string insertQuery = $"INSERT INTO \"{tableName}\" ({columns}) VALUES ({string.Join(", ", parameters)})";
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// 使用 NpgsqlCommand 而不是 SQLiteCommand
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using (var cmd = new NpgsqlCommand(insertQuery, db))
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{
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foreach (var kvp in columnValues)
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{
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if (kvp.Value is JObject jObj)
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{
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// JObject 转为字符串
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cmd.Parameters.AddWithValue("@" + kvp.Key, jObj.ToString());
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}
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else if (kvp.Value is JArray jArray)
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{
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// JArray 转为字符串
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cmd.Parameters.AddWithValue("@" + kvp.Key, jArray.ToString());
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}
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else
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{
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// 处理 null 值
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cmd.Parameters.AddWithValue("@" + kvp.Key, kvp.Value ?? DBNull.Value);
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}
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}
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cmd.ExecuteNonQuery();
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}
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}
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// 查询数据：执行任意查询语句并返回结果
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public List<Dictionary<string, object>> SelectData(string query, Dictionary<string, object> parameters = null)
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{
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var result = new List<Dictionary<string, object>>();
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using (var cmd = new NpgsqlCommand(query, db))
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{
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// 添加查询参数（如果有的话）
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if (parameters != null)
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{
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foreach (var kvp in parameters)
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{
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cmd.Parameters.AddWithValue("@" + kvp.Key, kvp.Value ?? DBNull.Value);
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}
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}
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using (var reader = cmd.ExecuteReader())
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{
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while (reader.Read())
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{
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var row = new Dictionary<string, object>();
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for (int i = 0; i < reader.FieldCount; i++)
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{
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row[reader.GetName(i)] = reader.GetValue(i);
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}
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result.Add(row);
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}
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}
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}
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return result;
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}
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// 更新数据：根据条件更新指定表中的记录
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public void UpdateData(string tableName, Dictionary<string, object> columnValues, string condition)
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{
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// 构建SET子句
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var setClause = string.Join(", ", columnValues.Keys.Select(k => $"\"{k}\" = @{k}"));
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string updateQuery = $"UPDATE \"{tableName}\" SET {setClause} WHERE {condition}";
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using (var cmd = new NpgsqlCommand(updateQuery, db))
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{
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foreach (var kvp in columnValues)
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{
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cmd.Parameters.AddWithValue("@" + kvp.Key, kvp.Value ?? DBNull.Value);
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}
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cmd.ExecuteNonQuery();
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}
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}
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// 删除数据：根据条件删除指定表中的记录
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public void DeleteData(string tableName, string condition)
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{
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string deleteQuery = $"DELETE FROM \"{tableName}\" WHERE {condition}";
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using (var cmd = new NpgsqlCommand(deleteQuery, db))
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{
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cmd.ExecuteNonQuery();
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}
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}
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// 支持事务操作：允许在同一个事务中执行多个操作
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public void ExecuteTransaction(Action transactionActions)
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{
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using (var transaction = db.BeginTransaction())
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{
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try
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{
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transactionActions.Invoke(); // 执行多个操作
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transaction.Commit(); // 提交事务
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}
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catch (Exception)
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{
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transaction.Rollback(); // 回滚事务
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throw;
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}
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}
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}
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// 删除所有表
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public void DropAllTables()
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{
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// 获取所有表名
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string getTablesQuery = "SELECT table_name FROM information_schema.tables WHERE table_schema = 'public';";
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var tables = SelectData(getTablesQuery);
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foreach (var table in tables)
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{
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string tableName = table["table_name"].ToString();
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string dropTableQuery = $"DROP TABLE IF EXISTS \"{tableName}\" CASCADE;";
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using (var cmd = new NpgsqlCommand(dropTableQuery, db))
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{
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cmd.ExecuteNonQuery();
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}
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}
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}
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public int ExecuteBatchInsert(string tableName, List<string> columns, string columnsStr, List<Dictionary<string, object>> batch, int batchIndex)
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{
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var valueParams = new List<string>();
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var parameters = new Dictionary<string, object>();
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for (int i = 0; i < batch.Count; i++)
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{
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var paramNames = columns.Select(col => $"@p{batchIndex}_{i}_{col}").ToList();
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valueParams.Add($"({string.Join(", ", paramNames)})");
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foreach (var col in columns)
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{
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parameters[$"p{batchIndex}_{i}_{col}"] = batch[i][col] ?? DBNull.Value;
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}
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}
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string insertQuery = $"INSERT INTO \"{tableName}\" ({columnsStr}) VALUES {string.Join(", ", valueParams)}";
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using (var transaction = db.BeginTransaction())
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using (var cmd = new NpgsqlCommand(insertQuery, db, transaction))
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{
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foreach (var param in parameters)
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{
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cmd.Parameters.AddWithValue(param.Key, param.Value);
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}
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int result = cmd.ExecuteNonQuery();
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transaction.Commit();
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return result;
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}
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}
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// 修改主方法
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public int BulkInsert(string tableName, List<Dictionary<string, object>> dataList)
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{
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if (dataList == null || dataList.Count == 0)
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return 0;
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int insertedCount = 0;
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var columns = dataList[0].Keys.ToList();
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var columnsStr = string.Join(", ", columns.Select(c => $"\"{c}\""));
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int batchSize = 500;
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int batchIndex = 0;
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for (int i = 0; i < dataList.Count; i += batchSize)
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{
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var batch = dataList.Skip(i).Take(batchSize).ToList();
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insertedCount += ExecuteBatchInsert(tableName, columns, columnsStr, batch, batchIndex);
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batchIndex++;
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}
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return insertedCount;
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}
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// 释放资源，关闭数据库连接
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public void Dispose()
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{
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if (!disposed)
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{
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if (db != null && db.State == ConnectionState.Open)
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{
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db.Close();
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db.Dispose();
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}
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disposed = true;
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}
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GC.SuppressFinalize(this);
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}
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// 析构函数，调用Dispose释放资源
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~PostgreSQL()
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{
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Dispose();
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}
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// PostgreSQL特有的方法：创建连接字符串的便捷方法
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public static string BuildConnectionString(string host, string database, string username, string password, int port = 5432)
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{
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return $"Host={host};Port={port};Database={database};Username={username};Password={password}";
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}
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}
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} |