华为云云数据库GaussDB执行sql语句_云淘科技
创建一个表:
EXEC SQL CREATE TABLE foo (a int, b varchar);
插入一行:
EXEC SQL INSERT INTO foo VALUES (5, 'abc');
删除一行:
EXEC SQL DELETE FROM foo WHERE a = 5;
更新表数据:
EXEC SQL UPDATE foo SET b = 'gdp' WHERE a = 7;
单行查询数据:
EXEC SQL SELECT a INTO :var_a FROM foo WHERE b = 'def';
完整使用示例:
#include #include #include int main () { ECPGdebug (1, stderr); EXEC SQL BEGIN DECLARE SECTION; int var_a; EXEC SQL END DECLARE SECTION; EXEC SQL CONNECT TO postgres; // 创建一个表 EXEC SQL CREATE TABLE foo (a int, b varchar); // 插入数据 EXEC SQL INSERT INTO foo VALUES (5, 'abc'); EXEC SQL INSERT INTO foo VALUES (6, 'def'); EXEC SQL INSERT INTO foo VALUES (7, 'ghi'); // 删除一行 EXEC SQL DELETE FROM foo WHERE a = 5; // 更新表数据 EXEC SQL UPDATE foo SET b = 'gdp' WHERE a = 7; // 单行查询表数据 EXEC SQL SELECT a INTO :var_a FROM foo WHERE b = 'def'; // 打印查询结果 printf("select res is %d ", var_a); EXEC SQL DISCONNECT; return 0; }
父主题: 执行SQL命令
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