利用ArcSDE C API向SQL SERVER空间数据库中添加实体图形
摘要：本文以一个C/C++实例分步讲述了利用ArcSDE C API向空间数据库中添加实体图形的方法。利用ArcSDE8.1 C API向空间数据库中添加实体图形大致可分为六步。步骤如下：
第一步：与空间数据库建立连接。
SE_CONNECTION handle; //空间数据库连接对象
SE_ERROR Connect_error; //错误状态
LONG rc; //执行结果状态
CHAR server = "LCR"; //空间数据库服务器名
CHAR instance = "esri_sde"; //空间数据库实例名
CHAR database = ""; //数据库名
CHAR user = "sa"; //用户名
CHAR passwd = "sapassword"; //密码
/* 创建连接 */
rc = SE_connection_create(
server, instance, database, user, passwd, &Connect_error, &handle);
/*错误检查 */
check_error (handle, NULL, rc, "SE_connection_create");
第二步：建立用户定义属性表。
LONG num_cols; //列数
SE_SHAPE shape; //形
SE_ENVELOPE rect; //矩形范围
LONG part_offsets, int_val;
CHAR **attrs; //属性列
CHAR column, table; //列与表
SE_COORDREF coordref; //坐标系引用
SE_POINT pt; //坐标点
SE_LAYERINFO layer; //层信息
SE_COLUMN_DEF *column_defs; //列定义对象
SE_STREAM stream; //数据流
/* 创建数据流连接 */
SE_stream_create (handle, &stream);
check_error (handle, NULL, rc, "SE_stream_create");
/* 创建用户表 */
strcpy(table, "MYTABLE");
num_cols = 1;
column_defs = (SE_COLUMN_DEF *) calloc (num_cols, sizeof(SE_COLUMN_DEF));
strcpy (column_defs.column_name, "ATTR_COL");
column_defs.sde_type = SE_INTEGER_TYPE; //为整形列
column_defs.nulls_allowed = TRUE; //允许为空
rc = SE_table_create(handle, table, num_cols, column_defs,"DEFAULTS");
check_error (handle, NULL, rc, "SE_table_create");
第三步：创建并设置图层信息。
/* 创建层的坐标系参考 */
rc = SE_coordref_create (&coordref);
check_error (handle, NULL, rc, "SE_coordref_create");
//设置假定坐标源点与比例尺
rc = SE_coordref_set_xy (coordref,0,0,10000);
check_error (handle, NULL, rc, "SE_coordref_set_xy");
//分配并初始化层信息结构layer
rc = SE_layerinfo_create (coordref, &layer);
check_error (handle, NULL, rc, "SE_layerinfo_create");
//设置层的格网尺寸、允许的形类型、创建关键字和空间列
rc = SE_layerinfo_set_grid_sizes (layer,1000,0,0);
check_error (handle, NULL, rc, "SE_layerinfo_set_grid_sizes");
rc = SE_layerinfo_set_shape_types(layer, SE_NIL_TYPE_MASK |
SE_POINT_TYPE_MASK |
SE_LINE_TYPE_MASK |
SE_SIMPLE_LINE_TYPE_MASK |
SE_AREA_TYPE_MASK |
SE_MULTIPART_TYPE_MASK );
check_error(handle, NULL, rc, "SE_layerinfo_set_shape_types");
rc = SE_layerinfo_set_creation_keyword (layer, "DEFAULTS");
check_error (handle, NULL, rc, "SE_layerinfo_set_creation_keyword");
strcpy(column, "SPATIAL_COL");
rc = SE_layerinfo_set_spatial_column (layer, table, column);
check_error (handle, NULL, rc, "SE_layerinfo_set_spatial_column");
/* 创建层 */
rc = SE_layer_create (handle, layer, 0,0);
check_error (handle, NULL, rc, "SE_layer_create");
第四步：创建图形实体对象，并设置属性与空间列。
/* 创建形 */
rc = SE_shape_create (coordref, &shape);
check_error (handle, NULL, rc, "SE_shape_create");
/* 将表插入数据流 */
attrs = (CHAR **) malloc (sizeof(CHAR *) * 2);
attrs = "ATTR_COL";
attrs = column;
rc = SE_stream_insert_table (stream, table, 2, (const CHAR**) attrs);
check_error (handle, NULL, rc, "SE_stream_insert_table");
free (attrs);
/* 设置矩形的最值并产生矩形*/
rect.minx = 5000.0;
rect.miny = 1000.0;
rect.maxx = 8000.0;
rect.maxy = 4000.0;
//生成矩形
rc = SE_shape_generate_rectangle (&rect, shape);
check_error (handle, NULL, rc, "SE_shape_generate_rectangle");
/* 设定形和属性列 */
int_val = 2;
rc = SE_stream_set_integer (stream, 1, &int_val);
check_error (NULL, stream, rc, "SE_stream_set_integer");
rc = SE_stream_set_shape (stream, 2, shape);
check_error (NULL, stream, rc, "SE_stream_set_shape");
/*插入行 */
rc = SE_stream_execute (stream);
check_error (NULL, stream, rc, "SE_stream_execute");
/* 对面域设定坐标数组 – 一个中间有洞的矩形，并生成多边形 */
part_offsets = 0;
pt.x = 1000.; pt.y = 1000.;
pt.x = 4000.; pt.y = 1000.;
pt.x = 4000.; pt.y = 4000.;
pt.x = 1000.; pt.y = 4000.;
pt.x = 1000.; pt.y = 1000.;
pt.x = 2000.; pt.y = 2000.;
pt.x = 2000.; pt.y = 3000.;
pt.x = 3000.; pt.y = 3000.;
pt.x = 3000.; pt.y = 2000.;
pt.x = 2000.; pt.y = 2000.;
//生成多边形
rc = SE_shape_generate_polygon (10,1,part_offsets,pt,NULL,NULL,shape);
check_error (handle, NULL, rc, "SE_shape_generate_polygon");
/* 设定形及属性列 */
int_val = 3;
rc=SE_stream_set_integer (stream, 1, &int_val);
check_error (NULL, stream, rc, "SE_stream_set_integer");
rc = SE_stream_set_shape (stream, 2, shape);
check_error (NULL, stream, rc, "SE_stream_set_shape");
/* 插入行 */
rc = SE_stream_execute (stream);
check_error (NULL, stream, rc, "SE_stream_execute");
第五步：释放资源，例如，形对象、坐标参考对象、数据流对象等。
SE_shape_free (shape);
SE_coordref_free (coordref);
SE_stream_free (stream);
第六步：关闭与空间数据库的连接。
SE_connection_free (handle);
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