本页面介绍了如何将 orafce 扩展程序手动添加到现有的 AlloyDB Omni 安装中。orafce 扩展程序提供模拟 Oracle 数据库中部分函数和软件包的函数和运算符。此扩展程序可简化将应用从 Oracle 迁移到与 PostgreSQL 兼容的数据库(如 AlloyDB Omni)的过程。
准备工作
在系统上安装 AlloyDB Omni。
将 orafce 添加到 AlloyDB Omni 安装
如需将 orafce 扩展程序添加到 AlloyDB Omni 安装,请按以下步骤操作:
查找已安装的 AlloyDB Omni 版本标签:
Docker
docker run --rm -it google/alloydbomni cat VERSION.txt
Podman
podman run --rm -it google/alloydbomni cat VERSION.txt
输出类似于以下内容:
AlloyDB Omni version: 16.3.0
记下 AlloyDB Omni 版本号,因为您在下一步中需要用到它。
构建包含 orafce 扩展程序的自定义 Docker 映像:
$ ~/alloydb-omni-orafce $ cd ~/alloydb-omni-orafce $ cat <<EOF > Dockerfile FROM google/alloydbomni:16.3.0-ubi RUN arch=$(uname -m) RUN dnf install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-9-$(arch)/pgdg-redhat-repo-latest.noarch.rpm RUN dnf install -y orafce_16 # On RHEL-based systems, PostgreSQL extensions like Orafce and PostGIS are typically installed in /usr/pgsql-16/share/extension and /usr/pgsql-16/lib. # This step creates symbolic links to those files in the paths expected by AlloyDB Omni, # which lets AlloyDB Omni locate extension control files and shared libraries without duplicating data. RUN \ for file in /usr/pgsql-16/share/extension/*; do \ target="/usr/lib/postgresql/16/share/extension/$(realpath -m --relative-to=/usr/pgsql-16/share/extension/ "$file")"; \ if [ ! -e "$target" ]; then \ ln -s "$file" "$target" || (echo "Failed to link \"$file\" to \"$target\", exiting." && exit 1); \ else \ echo "$target already exists"; \ fi; \ done && \ for file in /usr/pgsql-16/lib/*; do \ target="/usr/lib/postgresql/16/lib/$(realpath -m --relative-to=/usr/pgsql-16/lib/ "$file")"; \ if [ ! -e "$target" ]; then \ ln -s "$file" "$target" || (echo "Failed to link \"$file\" to \"$target\", exiting." && exit 1); \ else \ echo "$target already exists"; \ fi; \ done EOF
创建一个名为
my-omni-orafce
的 AlloyDB Omni 容器:docker build -t google/alloydbomni-with-orafce:latest docker run --name my-omni-orafce -e POSTGRES_PASSWORD=NEW_PASSWORD -d google/alloydbomni-with-orafce:OMNI_VERSION
使用 orafce 扩展程序连接到您的数据库:
docker exec -it my-omni-orafce psql -h localhost -U postgres
启用 orafce:
CREATE EXTENSION IF NOT EXISTS ORAFCE;
确认 orafce 已安装并已启用:
SELECT oracle.sysdate();
输出类似于以下内容:
postgres=# SELECT oracle.sysdate(); sysdate --------------------- 2024-06-10 16:36:30 (1 row)