云服务器内容精选

华为云首页用户手册

GaussDB(DWS)存储过程高级包

数据仓库服务 GAUSSDB(DWS)-DBMS_LOB:示例

示例 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 --获取字符串的长度 SELECT DBMS_LOB.GETLENGTH('12345678'); DECLARE myraw RAW(100); amount INTEGER :=2; buffer INTEGER :=1; begin DBMS_LOB.READ('123456789012345',amount,buffer,myraw); dbms_output.put_line(myraw); end; / CREATE TABLE blob_Table (t1 blob) DISTRIBUTE BY REPLICATION; CREATE TABLE blob_Table_bak (t2 blob) DISTRIBUTE BY REPLICATION; INSERT INTO blob_Table VALUES('abcdef'); INSERT INTO blob_Table_bak VALUES('22222'); DECLARE str varchar2(100) := 'abcdef'; source raw(100); dest blob; copyto blob; amount int; PSV_SQL varchar2(100); PSV_SQL1 varchar2(100); a int :=1; len int; BEGIN source := utl_raw.cast_to_raw(str); amount := utl_raw.length(source); PSV_SQL :='select * from blob_Table for update'; PSV_SQL1 := 'select * from blob_Table_bak for update'; EXECUTE IMMEDIATE PSV_SQL into dest; EXECUTE IMMEDIATE PSV_SQL1 into copyto; DBMS_LOB.WRITE(dest, amount, 1, source); DBMS_LOB.WRITEAPPEND(dest, amount, source); DBMS_LOB.ERASE(dest, a, 1); DBMS_OUTPUT.PUT_LINE(a); DBMS_LOB.COPY(copyto, dest, amount, 10, 1); DBMS_LOB.CLOSE(dest); RETURN; END; / --删除表 DROP TABLE blob_Table; DROP TABLE blob_Table_bak;

数据仓库服务 GAUSSDB(DWS) GaussDB(DWS)存储过程高级包
数据仓库服务 GAUSSDB(DWS)-DBMS_LOB:示例

示例 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 --获取字符串的长度 SELECT DBMS_LOB.GETLENGTH('12345678'); DECLARE myraw RAW(100); amount INTEGER :=2; buffer INTEGER :=1; begin DBMS_LOB.READ('123456789012345',amount,buffer,myraw); dbms_output.put_line(myraw); end; / CREATE TABLE blob_Table (t1 blob) DISTRIBUTE BY REPLICATION; CREATE TABLE blob_Table_bak (t2 blob) DISTRIBUTE BY REPLICATION; INSERT INTO blob_Table VALUES('abcdef'); INSERT INTO blob_Table_bak VALUES('22222'); DECLARE str varchar2(100) := 'abcdef'; source raw(100); dest blob; copyto blob; amount int; PSV_SQL varchar2(100); PSV_SQL1 varchar2(100); a int :=1; len int; BEGIN source := utl_raw.cast_to_raw(str); amount := utl_raw.length(source); PSV_SQL :='select * from blob_Table for update'; PSV_SQL1 := 'select * from blob_Table_bak for update'; EXECUTE IMMEDIATE PSV_SQL into dest; EXECUTE IMMEDIATE PSV_SQL1 into copyto; DBMS_LOB.WRITE(dest, amount, 1, source); DBMS_LOB.WRITEAPPEND(dest, amount, source); DBMS_LOB.ERASE(dest, a, 1); DBMS_OUTPUT.PUT_LINE(a); DBMS_LOB.COPY(copyto, dest, amount, 10, 1); DBMS_LOB.CLOSE(dest); RETURN; END; / --删除表 DROP TABLE blob_Table; DROP TABLE blob_Table_bak;

数据仓库服务 GAUSSDB(DWS) GaussDB(DWS)存储过程高级包
数据仓库服务 GAUSSDB(DWS)-DBMS_LOB:示例

示例 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 --获取字符串的长度 SELECT DBMS_LOB.GETLENGTH('12345678'); DECLARE myraw RAW(100); amount INTEGER :=2; buffer INTEGER :=1; begin DBMS_LOB.READ('123456789012345',amount,buffer,myraw); dbms_output.put_line(myraw); end; / CREATE TABLE blob_Table (t1 blob) DISTRIBUTE BY REPLICATION; CREATE TABLE blob_Table_bak (t2 blob) DISTRIBUTE BY REPLICATION; INSERT INTO blob_Table VALUES('abcdef'); INSERT INTO blob_Table_bak VALUES('22222'); DECLARE str varchar2(100) := 'abcdef'; source raw(100); dest blob; copyto blob; amount int; PSV_SQL varchar2(100); PSV_SQL1 varchar2(100); a int :=1; len int; BEGIN source := utl_raw.cast_to_raw(str); amount := utl_raw.length(source); PSV_SQL :='select * from blob_Table for update'; PSV_SQL1 := 'select * from blob_Table_bak for update'; EXECUTE IMMEDIATE PSV_SQL into dest; EXECUTE IMMEDIATE PSV_SQL1 into copyto; DBMS_LOB.WRITE(dest, amount, 1, source); DBMS_LOB.WRITEAPPEND(dest, amount, source); DBMS_LOB.ERASE(dest, a, 1); DBMS_OUTPUT.PUT_LINE(a); DBMS_LOB.COPY(copyto, dest, amount, 10, 1); DBMS_LOB.CLOSE(dest); RETURN; END; / --删除表 DROP TABLE blob_Table; DROP TABLE blob_Table_bak;

数据仓库服务 GAUSSDB(DWS) GaussDB(DWS)存储过程高级包