# 配置环境变量
$ export GAUSSHOME=/home/omm/openGauss-server/mppdb_temp_install
$ export LD_LIBRARY_PATH=$GAUSSHOME/lib:$LD_LIBRARY_PATH

$ which pg_config
# 预期结果
'/home/omm/openGauss-server/mppdb_temp_install/bin/pg_config'

# 删除psycopg2 for opengauss
$ pip install --force-reinstall psycopg2

# 若已经安装完成opengauss-sqlalchemy，重新安装
>>> python setup.py install

$ pip uninstall psycopg2
$ pip install psycopg2-binary

# 修改数据库实例下postgresql.conf文件中password_encryption_type = 1
$ vim /datanode/postgresql.conf

# 重启数据库
$ gs_ctl restart -D /datanode

修改密码
$ gsql -d postgres -p <port_num>
openGauss=# alter user <usrname> with password <yourpassword>;

# 从pypi安装
>>> python -m pip install opengauss-sqlalchemy

# 从本地源码安装
>>> python setup.py install

>>> import sqlalchemy as sa
# 访问集中式模式DB
>>> sa.create_engine('opengauss://username:password@host:port/database_name')
# 或
>>> sa.create_engine('opengauss+psycopg2://username:password@host:port/database_name')
# 访问分布式模式DB
>>> sa.create_engine('opengauss+dc_psycopg2://username:password@host:port/database_name')
# 或
>>> sa.create_engine('opengauss+dc_psycopg2://username:password@/database_name?host=hostA:portA&host=hostB:portB')

tbl = Table("testtbl", m, Column("data", String))
Index("test_idx1", tbl.c.data, opengauss_using="btree")

tbl = Table(
    "testtbl",
    m,
    Column("data", String),
    Column("data2", Integer, key="d2"),
)

Index(
    "test_idx1",
    tbl.c.data,
    tbl.c.d2,
    opengauss_ops={"data": "text_pattern_ops", "d2": "int4_ops"},
)

tbl = Table(
    "testtbl",
    m,
    Column("data", Integer),
    opengauss_partition_by="RANGE (data) ..."
)
Index("test_idx1", tbl.c.data, opengauss_local=[""])

Index(
    "test_idx2",
    tbl.c.data,
    opengauss_local=[
        "PARTITION data_index1",
        "PARTITION data_index2 TABLESPACE example3",
    ]
)

tbl = Table("testtbl", m, Column("data", String))
Index("test_idx1", tbl.c.data, opengauss_with={"fillfactor": 50})

tbl = Table("testtbl", m, Column("data", String))
Index("test_idx1", tbl.c.data, opengauss_tablespace="sometablespace")

tbl = Table("testtbl", m, Column("data", Integer))
Index(
    "test_idx1",
    tbl.c.data,
    opengauss_where=and_(tbl.c.data > 5, tbl.c.data < 10),
)

Table("some_table", ..., opengauss_with={"storage_parameter": "value"})

Table("some_talbe", ..., prefixes=["TEMPORARY"], opengauss_on_commit="PRESERVE ROWS")

Table("some_talbe", ..., opengauss_with={"ORIENTATION": "COLUMN"}, opengauss_compress=True)

Table("some_talbe", ..., opengauss_tablespace="tablespace_name")

Table("some_talbe", ..., opengauss_partition_by="RANGE(column_name) "
        "(PARTITION P1 VALUES LESS THAN(10), "
        "PARTITION P2 VALUES LESS THAN(MAXVALUE))")

Table("some_talbe", ..., opengauss_partition_by="RANGE(column_name) ...",
    opengauss_enable_row_movement=True)

tbl = Table(
    "test",
    m,
    Column("id", Integer),
    Column("bit_embedding", BIT(3)),
    Column("sparsevec_embedding", SPARSEVEC(3)),
    Column("vector_embedding", VECTOR(3))
)

select(tbl.c.id).order_by(tbl.c.bit_embedding.jaccard_distance('110'))

select(tbl.c.id).order_by(tbl.c.sparsevec_embedding.l2_distance(SparseVector([1, 2, 3])))

select(tbl.c.id).order_by(tbl.c.vector_embedding.l2_distance([1,2,3]))

tbl = Table("testtbl", m, Column("data", Integer))
Index("test_idx1", tbl.c.data, opengauss_concurrently=True)

Table("some_table", ..., opengauss_distribute_by="HASH(column_name)")

Table("some_table", ..., opengauss_to="GROUP group_name")

>>> python -m pip install wheel
>>> python setup.py bdist_wheel

openGauss=# create user scott identified by 'Tiger123';
openGauss=# create database test with owner=scott encoding='utf8' template=template0;
openGauss=# GRANT ALL PRIVILEGES TO scott;
openGauss=# ALTER DATABASE test SET default_text_search_config = 'pg_catalog.english';
openGauss=# \c test
test=# create schema test_schema AUTHORIZATION scott;
test=# create schema test_schema_2 AUTHORIZATION scott;
test=# \q

>>> gs_guc set -D ${db_dir}/data/single_node/ -c "ssl=off"
>>> gs_guc set -D ${db_dir}/data/single_node/ -c "max_prepared_transactions = 100"
>>> gs_guc reload -D ${db_dir}/data/single_node/ -h "local all scott sha256"
>>> gs_guc reload -D ${db_dir}/data/single_node/ -h "host all scott 127.0.0.1/32 sha256"
>>> gs_guc reload -D ${db_dir}/data/single_node/ -h "host all scott 0.0.0.0/0 sha256"
>>> gs_ctl stop -D ${db_dir}/data/single_node/
>>> gs_tl start -D ${db_dir}/data/single_node/

>>> gs_guc set -D ${db_dir}/data/single_node/ -c "log_min_error_statement = error"
>>> gs_guc set -D ${db_dir}/data/single_node/ -c "log_statement = 'all'"