Fix：修复 Kingbase 新增字段 SQL 语法 (#2180)

Co-authored-by: staff <staff@qimaos-MacBook-Pro.local>

crates/dbx-core/src/table_structure_sql/columns.rs

@@ -65,6 +65,7 @@ pub(super) fn build_column_sql(options: &TableStructureSqlOptions, warnings: &mu
             }
             statements.extend(build_add_column_sql(
                 dialect,
+                options.database_type,
                 &table,
                 column,
                 &position_clause,
@@ -200,6 +201,7 @@ pub(super) fn build_primary_key_sql(
 
 pub(super) fn build_add_column_sql(
     dialect: StructureDialect,
+    database_type: Option<crate::models::connection::DatabaseType>,
     table: &str,
     column: &EditableStructureColumn,
     position_clause: &str,
@@ -210,7 +212,13 @@ pub(super) fn build_add_column_sql(
     let mut statements = if dialect == StructureDialect::Oracle || dialect == StructureDialect::Informix {
         vec![format!("ALTER TABLE {table} ADD ({definition});")]
     } else {
-        let add_keyword = if dialect == StructureDialect::SqlServer { "ADD" } else { "ADD COLUMN" };
+        let add_keyword = if dialect == StructureDialect::SqlServer
+            || database_type == Some(crate::models::connection::DatabaseType::Kingbase)
+        {
+            "ADD"
+        } else {
+            "ADD COLUMN"
+        };
         vec![format!("ALTER TABLE {table} {add_keyword} {definition}{position_clause};")]
     };
     if matches!(dialect, StructureDialect::Postgres | StructureDialect::Oracle) && !clean(&column.comment).is_empty() {

crates/dbx-core/src/table_structure_sql/tests.rs

@@ -802,6 +802,27 @@ fn builds_rqlite_changes_with_sqlite_dialect() {
     );
 }
 
+#[test]
+fn builds_kingbase_add_column_without_column_keyword() {
+    let mut flag = column("flag");
+    flag.data_type = "varchar(100)".to_string();
+
+    let result = build_table_structure_change_sql(TableStructureSqlOptions {
+        database_type: Some(DatabaseType::Kingbase),
+        schema: Some("dbo".to_string()),
+        table_name: "dw_bill_info_copy".to_string(),
+        columns: vec![flag],
+        indexes: Vec::new(),
+        foreign_keys: Vec::new(),
+        triggers: Vec::new(),
+        table_comment: None,
+        original_table_comment: None,
+    });
+
+    assert_eq!(result.warnings, Vec::<String>::new());
+    assert_eq!(result.statements, vec!["ALTER TABLE \"dbo\".\"dw_bill_info_copy\" ADD \"flag\" varchar(100);"]);
+}
+
 #[test]
 fn builds_mysql_column_reorder_statements() {
     let mut id = column("id");