ApacheDbUtilsTest
ApacheDbUtilsTest
package p1; import com.DataSourceUtil;
import entity.Student;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.*;
import javax.sql.DataSource;
import java.util.List;
import java.util.Map; public class ApacheDbUtilsTest {
public static void main(String[] args) throws Exception {
// ArrayHandler();
// ArrayListHandler();
// ArrayListHandlerStudent();
// ArrayListHandlerStudentList();
// ArrayListHandlerStudentMap();
// MapHandler();
// MapListHandler();
// KeyedHandler();
MapHandlerParams();
} public static void MapHandlerParams() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>? and name like ?";
Map<String, Object> students = runner.query(sql, new MapHandler(), 1, "%w%");
System.out.println(students);
} public static void KeyedHandler() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
Map<String, Map<String, Object>> students = runner.query(sql, new KeyedHandler<>("name"), 1);
System.out.println(students);
} public static void MapListHandler() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
List<Map<String, Object>> students = runner.query(sql, new MapListHandler(), 1);
System.out.println(students);
} public static void MapHandler() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
Map<String, Object> students = runner.query(sql, new MapHandler(), 1);
System.out.println(students);
} public static void ArrayListHandlerStudentMap() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
//此处坑 oracle默认数值类型为BigDecimal Integer更换为BigDecimal students.get(new BigDecimal(2))
Map<Integer, Student> students = runner.query(sql, new BeanMapHandler<Integer, Student>(Student.class, "id"), 1);
Student student = students.get(2);
System.out.println(student.getId() + " " + student.getName());
} public static void ArrayListHandlerStudentList() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
List<Student> students = runner.query(sql, new BeanListHandler<>(Student.class), 1);
for (Student student : students) {
System.out.println(student.getId() + " " + student.getName());
}
} public static void ArrayListHandlerStudent() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
Student student = runner.query(sql, new BeanHandler<>(Student.class), 1);
System.out.println(student.getId() + " " + student.getName());
} public static void ArrayListHandler() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
List<Object[]> objects = runner.query(sql, new ArrayListHandler(), 1);
for (Object[] objs : objects) {
System.out.println(objs[0] + " " + objs[1]);
}
} public static void ArrayHandler() throws Exception {
DataSource dataSource = DataSourceUtil.getDataSourceC3p0();
QueryRunner runner = new QueryRunner(dataSource);
String sql = "select * from student where id>?";
Object[] objs = runner.query(sql, new ArrayHandler(), 1);
System.out.println(objs[0]);
System.out.println(objs[1]);
}
}
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