# 第四部分。

客户端接口这部分描述了与 PostgreSQL 一起分发的客户端编程接口。这些章节中的每一章都可以独立阅读。[请注意，客户端程序还有许多其他编程接口，它们分别分发并包含它们自己的文档（](external-projects.html)附录 H列出了一些比较流行的）。[本部分的读者应该熟悉使用 SQL 命令来操作和查询数据库（参见](sql.html)第二部分

**)，当然还有接口使用的编程语言。**

[目录34. libpq——C 库](libpq.html)

[34.1.数据库连接控制函数](libpq-connect.html)

[34.2.连接状态功能](libpq-status.html)

[34.3.命令执行函数](libpq-exec.html)

[34.4.异步命令处理](libpq-async.html)

[34.5.流水线模式](libpq-pipeline-mode.html)

[34.6.逐行检索查询结果](libpq-single-row-mode.html)

[34.7.取消正在进行的查询](libpq-cancel.html)

[34.8.快速路径接口](libpq-fastpath.html)

[34.9.异步通知](libpq-notify.html)

[34.10.与相关的功能`复制`命令](libpq-copy.html)

[34.11.控制功能](libpq-control.html)

[34.12.杂项功能](libpq-misc.html)

[34.13.通知处理](libpq-notice-processing.html)

[34.14.事件系统](libpq-events.html)

[34.15.环境变量](libpq-envars.html)

[34.16.密码文件](libpq-pgpass.html)

[34.17.连接服务文件](libpq-pgservice.html)

[34.18. LDAP查找连接参数](libpq-ldap.html)

[34.19. SSL支持](libpq-ssl.html)

[34.20. 线程程序中的行为](libpq-threading.html)

[34.21. 构建libpq程序](libpq-build.html)

[34.22. 示例程序](libpq-example.html)

[35.大型物体](largeobjects.html)

[35.1. 介绍](lo-intro.html)

[35.2. 实现特性](lo-implementation.html)

[35.3. 客户端接口](lo-interfaces.html)

[35.4. 服务器端功能](lo-funcs.html)

[35.5. 示例程序](lo-examplesect.html)

[36.ECPG-C中的嵌入式SQL](ecpg.html)

[36.1. 概念](ecpg-concept.html)

[36.2. 管理数据库连接](ecpg-connect.html)

[36.3. 运行SQL命令](ecpg-commands.html)

[36.4. 使用主机变量](ecpg-variables.html)

[36.5. 动态结构化查询语言](ecpg-dynamic.html)

[36.6. pgtypes库](ecpg-pgtypes.html)

[36.7. 使用描述符区域](ecpg-descriptors.html)

[36.8. 错误处理](ecpg-errors.html)

[36.9. 预处理指令](ecpg-preproc.html)

[36.10. 处理嵌入式SQL程序](ecpg-process.html)

[36.11. 图书馆职能](ecpg-library.html)

[36.12. 大型物体](ecpg-lo.html)

[36.13. C++应用程序](ecpg-cpp.html)

[36.14. 嵌入式SQL命令](ecpg-sql-commands.html)

[36.15. Informix兼容模式](ecpg-informix-compat.html)

[36.16. 内部构件](ecpg-develop.html)

[37.信息模式](information-schema.html)

[37.1. 模式](infoschema-schema.html)

[37.2. 数据类型](infoschema-datatypes.html)

[37.3. `信息\模式\目录\名称`](infoschema-information-schema-catalog-name.html)

[37.4. `可管理的角色_​授权`](infoschema-administrable-role-authorizations.html)

[37.5. `适用的职位`](infoschema-applicable-roles.html)

[37.6. `属性`](infoschema-attributes.html)

[37.7. `字符集`](infoschema-character-sets.html)

[37.8. `检查_约束_常规_使用情况`](infoschema-check-constraint-routine-usage.html)

[37.9. `检查约束`](infoschema-check-constraints.html)

[37.10. `校勘`](infoschema-collations.html)

[37.11. `排序规则字符集_​适用性`](infoschema-collation-character-set-applicab.html)

[37.12. `column_column_用法`](infoschema-column-column-usage.html)

[37.13. `列_域_用法`](infoschema-column-domain-usage.html)

[37.14. `列_选项`](infoschema-column-options.html)

[37.15. `列_特权`](infoschema-column-privileges.html)

[37.16. `列_udt_用法`](infoschema-column-udt-usage.html)

[37.17. `柱`](infoschema-columns.html)

[37.18. `约束_列_用法`](infoschema-constraint-column-usage.html)

[37.19. `约束_表_用法`](infoschema-constraint-table-usage.html)

[37.20. `数据类型权限`](infoschema-data-type-privileges.html)

[37.21. `域约束`](infoschema-domain-constraints.html)

[37.22. `域_udt_用法`](infoschema-domain-udt-usage.html)

[37.23. `领域`](infoschema-domains.html)

[37.24. `元素类型`](infoschema-element-types.html)

[37.25. `启用\u角色`](infoschema-enabled-roles.html)

[37.26. `外部\u数据\u包装\u选项`](infoschema-foreign-data-wrapper-options.html)

[37.27. `外国数据包装`](infoschema-foreign-data-wrappers.html)

[37.28. `外部服务器选项`](infoschema-foreign-server-options.html)

[37.29. `外国服务器`](infoschema-foreign-servers.html)

[37.30. `国外表格选项`](infoschema-foreign-table-options.html)

[37.31. `外卖桌`](infoschema-foreign-tables.html)

[37.32. `键_列_用法`](infoschema-key-column-usage.html)

[37.33. `参数`](infoschema-parameters.html)

[37.34. `参考约束`](infoschema-referential-constraints.html)

[37.35. `角色_专栏_助学金`](infoschema-role-column-grants.html)

[37.36. `角色_常规_拨款`](infoschema-role-routine-grants.html)

[37.37. `角色表赠款`](infoschema-role-table-grants.html)

[37.38. `角色udt_grants`](infoschema-role-udt-grants.html)

[37.39. `角色使用授权`](infoschema-role-usage-grants.html)

[37.40. `常规_列_用法`](infoschema-routine-column-usage.html)

[37.41. `常规特权`](infoschema-routine-privileges.html)

[37.42. `例行公事例行公事用法`](infoschema-routine-routine-usage.html)

[37.43. `常规_顺序_用法`](infoschema-routine-sequence-usage.html)

[37.44. `常规表格使用`](infoschema-routine-table-usage.html)

[37.45. `日常工作`](infoschema-routines.html)

[37.46. `图式`](infoschema-schemata.html)

[37.47. `序列`](infoschema-sequences.html)

[37.48. `sql_特性`](infoschema-sql-features.html)

[37.49. `sql_实现_信息`](infoschema-sql-implementation-info.html)

[37.50. `sql_零件`](infoschema-sql-parts.html)

[37.51. `sql_大小`](infoschema-sql-sizing.html)

[37.52. `表2.1.1约束条件`](infoschema-table-constraints.html)

[37.53. `表2.特权`](infoschema-table-privileges.html)

[37.54. `桌子`](infoschema-tables.html)

[37.55. `转变`](infoschema-transforms.html)

[37.56. `触发的更新列`](infoschema-triggered-update-columns.html)

[37.57. `触发`](infoschema-triggers.html)

[37.58. `udt_特权`](infoschema-udt-privileges.html)

[37.59. `使用权限`](infoschema-usage-privileges.html)

[37.60. `用户定义的类型`](infoschema-user-defined-types.html)

[37.61. `用户映射选项`](infoschema-user-mapping-options.html)

[37.62. `用户映射`](infoschema-user-mappings.html)

[37.63. `查看_列_用法`](infoschema-view-column-usage.html)

[37.64. `查看_常规_用法`](infoschema-view-routine-usage.html)

[37.65. `查看表格使用情况`](infoschema-view-table-usage.html)

[37.66. `意见`](infoschema-views.html)