fix(gencode): 修复数据库类型映射和导入处理问题

backend/README.md

@@ -170,3 +170,226 @@ uv run ruff check --watch
 ---
 
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+
+---
+
+## mysql 全类型测试表
+
+```sql
+CREATE TABLE `gen_all_types_demo` (
+  `tinyint_field` TINYINT NOT NULL COMMENT 'TINYINT类型',
+  `tinyint_unsigned_field` TINYINT UNSIGNED NOT NULL COMMENT 'TINYINT UNSIGNED类型',
+  `smallint_field` SMALLINT NOT NULL COMMENT 'SMALLINT类型',
+  `smallint_unsigned_field` SMALLINT UNSIGNED NOT NULL COMMENT 'SMALLINT UNSIGNED类型',
+  `mediumint_field` MEDIUMINT NOT NULL COMMENT 'MEDIUMINT类型',
+  `mediumint_unsigned_field` MEDIUMINT UNSIGNED NOT NULL COMMENT 'MEDIUMINT UNSIGNED类型',
+  `int_field` INT NOT NULL COMMENT 'INT类型',
+  `int_unsigned_field` INT UNSIGNED NOT NULL COMMENT 'INT UNSIGNED类型',
+  `bigint_field` BIGINT NOT NULL COMMENT 'BIGINT类型',
+  `bigint_unsigned_field` BIGINT UNSIGNED NOT NULL COMMENT 'BIGINT UNSIGNED类型',
+  `float_field` FLOAT NOT NULL COMMENT 'FLOAT类型',
+  `double_field` DOUBLE NOT NULL COMMENT 'DOUBLE类型',
+  `decimal_field` DECIMAL(10,2) NOT NULL COMMENT 'DECIMAL类型',
+  `decimal_unsigned_field` DECIMAL(10,2) UNSIGNED NOT NULL COMMENT 'DECIMAL UNSIGNED类型',
+  `numeric_field` NUMERIC(10,2) NOT NULL COMMENT 'NUMERIC类型',
+  `bit_field` BIT(8) NOT NULL COMMENT 'BIT类型',
+  `char_field` CHAR(32) NOT NULL COMMENT 'CHAR类型',
+  `varchar_field` VARCHAR(255) NOT NULL COMMENT 'VARCHAR类型',
+  `binary_field` BINARY(32) NOT NULL COMMENT 'BINARY类型',
+  `varbinary_field` VARBINARY(255) NOT NULL COMMENT 'VARBINARY类型',
+  `tinyblob_field` TINYBLOB COMMENT 'TINYBLOB类型',
+  `blob_field` BLOB COMMENT 'BLOB类型',
+  `mediumblob_field` MEDIUMBLOB COMMENT 'MEDIUMBLOB类型',
+  `longblob_field` LONGBLOB COMMENT 'LONGBLOB类型',
+  `tinytext_field` TINYTEXT COMMENT 'TINYTEXT类型',
+  `text_field` TEXT COMMENT 'TEXT类型',
+  `mediumtext_field` MEDIUMTEXT COMMENT 'MEDIUMTEXT类型',
+  `longtext_field` LONGTEXT COMMENT 'LONGTEXT类型',
+  `enum_field` ENUM('active','inactive','pending') NOT NULL DEFAULT 'pending' COMMENT 'ENUM类型',
+  `set_field` SET('read','write','execute') NOT NULL DEFAULT '' COMMENT 'SET类型',
+  `date_field` DATE NOT NULL COMMENT 'DATE类型',
+  `time_field` TIME NOT NULL COMMENT 'TIME类型',
+  `datetime_field` DATETIME NOT NULL COMMENT 'DATETIME类型',
+  `timestamp_field` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT 'TIMESTAMP类型',
+  `year_field` YEAR NOT NULL COMMENT 'YEAR类型',
+  `json_field` JSON COMMENT 'JSON类型',
+  `id` BIGINT NOT NULL AUTO_INCREMENT COMMENT '主键ID',
+  `uuid` VARCHAR(64) NOT NULL COMMENT 'UUID全局唯一标识',
+  `status` VARCHAR(10) NOT NULL DEFAULT '0' COMMENT '是否启用(0:启用 1:禁用)',
+  `description` TEXT COMMENT '备注/描述',
+  `created_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
+  `updated_time` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
+  `created_id` BIGINT DEFAULT NULL COMMENT '创建人ID',
+  `updated_id` BIGINT DEFAULT NULL COMMENT '更新人ID',
+  PRIMARY KEY (`id`),
+  UNIQUE KEY `uuid` (`uuid`),
+  KEY `ix_gen_all_types_demo_created_id` (`created_id`),
+  KEY `ix_gen_all_types_demo_updated_id` (`updated_id`),
+  KEY `ix_gen_all_types_demo_status` (`status`),
+  KEY `ix_gen_all_types_demo_created_time` (`created_time`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci COMMENT='全类型测试表';
+```
+
+## postgresql 全类型测试表
+
+```sql
+-- PostgreSQL 全类型测试表
+CREATE TABLE gen_all_types_demo (
+  -- 整数类型
+  smallint_field SMALLINT NOT NULL,
+  integer_field INTEGER NOT NULL,
+  bigint_field BIGINT NOT NULL,
+
+  -- 浮点类型
+  real_field REAL NOT NULL,
+  double_precision_field DOUBLE PRECISION NOT NULL,
+  numeric_field NUMERIC(10,2) NOT NULL,
+  decimal_field DECIMAL(10,2) NOT NULL,
+
+  -- 字符串类型
+  char_field CHAR(32) NOT NULL,
+  varchar_field VARCHAR(255) NOT NULL,
+  text_field TEXT NOT NULL,
+
+  -- 二进制类型
+  bytea_field BYTEA,
+
+  -- 日期时间类型
+  date_field DATE NOT NULL,
+  time_field TIME NOT NULL,
+  time_with_tz_field TIMESTAMP WITH TIME ZONE NOT NULL,
+  time_without_tz_field TIMESTAMP WITHOUT TIME ZONE NOT NULL,
+  timestamp_field TIMESTAMP NOT NULL,
+  timestamp_with_tz_field TIMESTAMP WITH TIME ZONE NOT NULL,
+  timestamp_without_tz_field TIMESTAMP WITHOUT TIME ZONE NOT NULL,
+  interval_field INTERVAL,
+
+  -- 布尔类型
+  boolean_field BOOLEAN NOT NULL,
+
+  -- JSON类型
+  json_field JSON,
+  jsonb_field JSONB,
+
+  -- 其他类型
+  uuid_field UUID,
+  inet_field INET,
+  cidr_field CIDR,
+  macaddr_field MACADDR,
+
+  -- 几何类型
+  point_field POINT,
+  line_field LINE,
+  lseg_field LSEG,
+  box_field BOX,
+  path_field PATH,
+  polygon_field POLYGON,
+  circle_field CIRCLE,
+
+  -- 位类型
+  bit_field BIT(8) NOT NULL,
+  bit_varying_field VARBIT(8) NOT NULL,
+
+  -- 文本搜索类型
+  tsvector_field TSVECTOR,
+  tsquery_field TSQUERY,
+
+  -- XML类型
+  xml_field XML,
+
+  -- 数组类型
+  array_field INTEGER[],
+
+  -- 范围类型
+  range_field INT4RANGE,
+
+  -- 货币类型
+  money_field MONEY,
+
+  -- 对象标识符类型
+  oid_field OID,
+  regproc_field REGPROC,
+  regclass_field REGCLASS,
+  regtype_field REGTYPE,
+  regrole_field REGROLE,
+  regnamespace_field REGNAMESPACE,
+
+  -- 常用字段
+  id BIGSERIAL PRIMARY KEY,
+  uuid VARCHAR(64) NOT NULL UNIQUE,
+  status VARCHAR(10) NOT NULL DEFAULT '0',
+  description TEXT,
+  created_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  updated_time TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
+  created_id BIGINT,
+  updated_id BIGINT
+);
+
+```
+
+## mysql类型
+
+INT
+VARCHAR
+CHAR
+DATETIME
+TIMESTAMP
+DATE
+BIT
+FLOAT
+DOUBLE
+DECIMAL
+BIGINT
+TEXT
+JSON
+BLOB
+BINARY
+ENUM
+SET
+TINYINT
+SMALLINT
+MEDIUMINT
+TIME
+YEAR
+VARBINARY
+TINYBLOB
+MEDIUMBLOB
+LONGBLOB
+TINYTEXT
+MEDIUMTEXT
+LONGTEXT
+GEOMETRY
+POINT
+LINESTRING
+POLYGON
+MULTIPOINT
+MULTILINESTRING
+MULTIPOLYGON
+GEOMETRYCOLLECTION
+
+## pg类型
+
+INTEGER
+VARCHAR
+CHAR
+TIMESTAMP
+DATE
+BOOLEAN
+FLOAT
+TEXT
+JSON
+BLOB
+SMALLINT
+BIGINT
+REAL
+DOUBLE PRECISION
+BYTEA
+XML
+UUID
+ARRAY
+NUMERIC
+MONEY
+INTERVAL
+CIDR
+INET
+MACADDR